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Vent Field Name IDsort ascending Activity Tectonic Setting Region Latitude Longitude Maximum or Single Reported Depth Year and How Discovered
Zouyu ridge active, confirmed mid-ocean ridge S MAR -13.2800 -14.4100 2315 2009 towed video
Zenith-Victory inactive mid-ocean ridge N MAR 20.1292 -45.6225 2390 2008 (need citation to confirm that the field was discovered by TV-profiling and dredging)
Zealandia active, inferred arc volcano Mariana Arc 16.8800 145.8500 144 2003 plume only; 2009 or earlier ROV did not confirm activity
Yoron Hole active, confirmed back-arc spreading center Okinawa Trough 27.4916 127.5333 590 2010 ROV Hyperdolphin
Yokosuka active, confirmed back-arc spreading center Okinawa Trough 25.2638 124.3733 2190 2016 ROV Kaiko; 2014 plume only
Yali active, confirmed arc volcano Hellenic Arc, Aegean Sea 36.6600 27.1300 3 1991 or earlier, from beach
Wright volcanic center active, confirmed arc volcano Kermadec Arc -31.8500 -179.1880 1165 2005 submersible PISCES V; 2004 plume NZAPLUME III cruise
Woodlark Basin, Segment 5B active, inferred back-arc spreading center Woodlark Basin -9.2540 156.1910 3550 1986 plume only; 2000 plume only
Woodlark Basin, Segment 3B active, inferred back-arc spreading center Woodlark Basin -9.8000 155.0667 3300 2009 plume only
White Point, Palos Verde, California active, confirmed other Coastal California 33.7000 -118.3167 10 1984 or earlier, likely by SCUBA
White Lady active, confirmed back-arc spreading center North Fiji Basin -16.9833 173.9167 2000 1988 towed camera and plume; 1989 submersible Nautile
White Island active, confirmed back-arc spreading center Taupo Volcanic Zone -37.5191 177.1953 30 1989 or earlier, likely SCUBA
White Church active, confirmed back-arc spreading center Lau Basin -21.9612 -176.5234 1960 1989 submersible Nautile; 2004 plume survey
Whale Island active, confirmed back-arc spreading center Taupo Volcanic Zone -37.8600 176.9800 42 1990 or earlier, likely by SCUBA
western Manus Basin, Bismarck Sea inactive back-arc spreading center Manus Basin -3.0000 147.0000 1800 NotProvided
West Valley active, inferred mid-ocean ridge JdF Ridge 48.4833 -129.0417 3000 1987 and 1988 deposits only (towed camera did not confirm activity)
West Rota volcano active, confirmed arc volcano Mariana Arc 14.3250 144.8330 1150 2005 ROV Hyper-Dolphin; 2003 plume only; 2004 ROV ROPOS did not observe venting
West Mata submarine volcano active, confirmed arc volcano Tonga Arc -15.0950 -173.7500 1208 2009 ROV Jason II; 2008 eruption plume detected
West Fiji Ridge active, inferred back-arc spreading center North Fiji Basin -17.0000 176.0000 3000 1995 deep tow
Walsh active, inferred mid-ocean ridge Mid-Cayman Rise 17.8333 -81.8333 4000 2009 plume only; 2013 plume only
Wagner Basin active, inferred mid-ocean ridge Gulf of California 31.0666 -114.0833 120 2007 echosounder and grab samples
W Syoyo active, inferred arc volcano Mariana Arc 22.5080 142.5330 2150 2003 plume only
W Los Huellos Caldera active, inferred mid-ocean ridge Galapagos Rift 1.0000 -90.6000 1600 2005 plume only
W Eye of Mordor inactive mid-ocean ridge Galapagos Rift 1.9707 -91.3900 1600 2005 towed video Medea observed inactive chimneys
Vulkanolog active, confirmed arc volcano Kermadec Arc -30.6870 -178.4530 130 1979 and 1998 (need to check references); 2002 plume not detected NZAPLUME II
Vulcano active, confirmed arc volcano Aeolian Arc, Tyrrhenian Sea 38.4000 15.0000 8 1960's shallow vents
Von Damm active, confirmed mid-ocean ridge Mid-Cayman Rise 18.3777 -81.7972 2372 2010 AUV Autosub6000 and HyBIS TVG; 2009 plume only
Vityaz megamullion active, inferred mid-ocean ridge CIR -5.4000 68.5833 3500 1979 plume and deposits only
Vienna Woods, Hydrothermal Field 4 active, confirmed back-arc spreading center Manus Basin -3.3712 150.0360 2240 1990 TV-grab
Vienna Woods active, confirmed back-arc spreading center Manus Basin -3.1667 150.2833 2500 1990 TV-grab (also same year, sampled by submersible Mir); 1985 (or 1986) camera tow vent fauna and inactive chimneys
VFR, unnamed active, inferred back-arc spreading center Lau Basin -22.5150 -176.6500 1970 2004 plume only
VFR, plume 4 active, inferred back-arc spreading center Lau Basin -22.3400 -176.6590 1700 2004 plume only
VFR, plume 3 active, inferred back-arc spreading center Lau Basin -22.4000 -176.6790 1980 2004 plume only
VFR, plume 12 active, inferred back-arc spreading center Lau Basin -21.7300 -176.4530 1910 2004 plume only
VFR, ELSC7 active, inferred back-arc spreading center Lau Basin -22.8833 -176.7500 2050 2009 plume and dredge only
Vema Fracture Zone active, inferred other N MAR 10.7100 -42.6800 5180 2015 plume only
VC7 active, inferred arc volcano Hellenic Arc, Aegean Sea 36.5608 25.5250 320 2010 ROV Hercules
Vailulu'u Seamount active, confirmed intra-plate volcano Central Pacific -14.2167 -169.0667 1000 2005 submersible Pisces V; 2000 plume only
Vai Lili active, confirmed back-arc spreading center Lau Basin -22.2151 -176.6083 1764 1989 submersible Nautile
Uka Pacha active, confirmed mid-ocean ridge Galapagos Rift 0.7700 -88.3000 2100 2011 ROV Little Hercules
Tutum Bay, Ambitle Island active, confirmed arc volcano Tabar-Feni Arc -4.0833 153.5500 10 1996 or earlier, likely by SCUBA
Tu'i Malila active, confirmed back-arc spreading center Lau Basin -21.9876 -176.5678 1870 2005 ROV Jason II; 2004 plume only
Troll Wall active, confirmed mid-ocean ridge Mohns Ridge 71.2833 -5.7667 550 2005 ROV BIODEEP-05 cruise
Tripartite Ridge, south of TR3 inactive back-arc spreading center North Fiji Basin -14.0745 175.4729 3000 NotProvided
Tripartite Ridge, south of TR1 inactive back-arc spreading center North Fiji Basin -14.5000 177.0000 3000 NotProvided
Tow Cam active, confirmed back-arc spreading center Lau Basin -20.3169 -176.1367 2700 2004 AUV ABE; 2004 plume only on previous cruise
TOTO Caldera active, confirmed arc volcano Mariana Arc 12.7167 143.5333 2960 2000 deep-tow camera (later, same year - ROV Kaiko); 1998 or earlier hydrothermal deposits dredged; 1998 plume only
Tonga Arc, Volcano J1 active, inferred arc volcano Tonga Arc -17.2400 -173.9500 560 2004 plume only
Tonga Arc, Volcano D active, inferred arc volcano Tonga Arc -19.4500 -174.9167 760 2004 plume only
Tonga Arc, Volcano C active, inferred arc volcano Tonga Arc -20.1800 -175.2000 1050 2004 SS11/2004 cruise did not detect hydrothermal activity
Tonga Arc, Volcano A active, inferred arc volcano Tonga Arc -20.8600 -175.5500 700 2004 plume only
Tonga Arc, Volcano 8 active, inferred arc volcano Tonga Arc -22.8433 -176.4317 240 2003 plume and dredge only
Tonga Arc, Volcano 4 active, inferred arc volcano Tonga Arc -22.0670 -176.2080 200 2003 plume and dredge only
Tonga Arc, Volcano 19 active, confirmed arc volcano Tonga Arc -24.8000 -177.0167 970 2005 with submersibles PISCES IV and PISCES V and ROV RCV-150; 2003 plume and dredge only
Tonga Arc, Volcano 18 active, confirmed arc volcano Tonga Arc -24.5850 -176.9170 1465 2011 ROV MAGNUM; 2003 plume and dredge only
Tonga Arc, Volcano 16 active, inferred arc volcano Tonga Arc -24.1883 -176.8217 1400 2003 plume and dredge only
Tonga Arc, Volcano 15 active, inferred arc volcano Tonga Arc -23.9000 -176.7800 1400 2003 plume only
Tonga Arc, Volcano 14 active, inferred arc volcano Tonga Arc -23.5750 -176.7050 985 2003 plume and dredge only
Tonga Arc, Volcano 1 active, confirmed arc volcano Tonga Arc -21.1500 -175.7500 210 2005 with submersibles PISCES IV and PISCES V and ROV RCV-150; 2003 plume and dredge only
Tiancheng active, confirmed mid-ocean ridge SWIR -27.9670 63.5500 3600 2014 HOV Jiaolong; 1997 plume only; 2009 DY115-20 Leg 7 plume and deposits;
Three Sisters, Middle Sister active, inferred back-arc spreading center Bransfield Strait -62.6420 -58.9833 1040 1995 plume only; 1999 still had no visual confirmation
Tevnia active, inferred mid-ocean ridge N EPR 10.3333 -103.5533 2925 1994 submersible Alvin did not confirm activity
Teotihuacan active, confirmed mid-ocean ridge N EPR 15.7333 -105.4333 2300 2010 submersible Nautile; 1997 plume only
Tempus Fugit active, confirmed mid-ocean ridge Galapagos Rift 0.7683 -85.9100 2560 2011 ROV Little Hercules
Temakons active, confirmed back-arc spreading center New Hebrides back-arc -17.5667 169.1000 1400 1994 towed camera with temperature
TELVE active, confirmed back-arc spreading center Lau Basin -22.1667 -176.6040 1760 2008 commercial ROV; 2003 plume only
Teahitia seamount active, confirmed intra-plate volcano Central Pacific -17.5670 -148.8167 1460 1983 submersible Cyana
Tarama Knoll active, confirmed back-arc spreading center Okinawa Trough 25.0916 124.5416 1990 2009 ROV HyperDolphin
Tangyin active, inferred back-arc spreading center Okinawa Trough 25.0667 122.5667 1206 2014 likely by dredging or ROV during the HOBAB3 cruise on R/V Kexue
Tangaroa volcano active, confirmed arc volcano Kermadec Arc -36.3250 178.0333 890 2012 likely towed video or TV grab; 1999 plume only
Taketomi Thermal Area active, confirmed arc volcano Ryukyu Arc 24.3483 124.1017 23 1987 or earlier, likely by SCUBA
TaiJi active, inferred mid-ocean ridge S MAR -13.5900 -14.5200 3180 2011 plume only
Tahi Moana 7 active, inferred back-arc spreading center Lau Basin -15.3300 -174.2500 1940 2004 plume only; 2008 plume only; 2009 video camera tow (activity not confirmed)
Tahi Moana 2 active, confirmed back-arc spreading center Lau Basin -21.9200 -176.5330 1870 1989 submersible Nautile (need reference to check if activity confirmed); 2004 plume only; 2008 commercial ROV (report does not confirm activity)
Tahi Moana 1 active, confirmed back-arc spreading center Lau Basin -20.6900 -176.1800 2256 2008 commercial ROV; 2004 plume only
TAG active, confirmed mid-ocean ridge N MAR 26.1367 -44.8267 3670 1985 towed camera and temperature anomaly; 1986 submersible Alvin
Tafu active, confirmed back-arc spreading center Lau Basin -15.3833 -174.2500 1400 2008 or 2009 commercial ROV; 2008 plume only; 2009 ROV Jason II
SWIR, unnamed, Segment 26 active, inferred mid-ocean ridge SWIR -37.6080 50.8527 2800 2008 dredge only DY115-20 Leg 6
SWIR, Plume 6 active, inferred mid-ocean ridge SWIR -27.7670 65.1330 3200 1997 plume only
SWIR, Plume 5 active, inferred mid-ocean ridge SWIR -27.9170 64.4500 4000 1997 plume only
SWIR, Plume 3, Segment 16 active, inferred mid-ocean ridge SWIR -30.8500 59.3830 3900 1997 plume only
SWIR, Plume 2, Segment 16 active, inferred mid-ocean ridge SWIR -31.0670 58.9670 4200 1997 plume only
SWIR, Plume 1, Segment 17 active, inferred mid-ocean ridge SWIR -31.1830 58.5000 3600 1997 plume only
SWIR, D9B active, inferred mid-ocean ridge SWIR -52.7070 18.8170 3931 2000-2001 plume and dredge only
SWIR, D82 active, inferred mid-ocean ridge SWIR -52.2080 15.5830 4100 2000-2001 plume only
SWIR, D62 active, inferred mid-ocean ridge SWIR -52.2530 15.1030 3990 2000-2001 plume and dredge only
SWIR, D57 active, inferred mid-ocean ridge SWIR -52.2240 13.7380 3517 2000-2001 plume and dredge only
SWIR, D54 active, inferred mid-ocean ridge SWIR -52.4370 13.3120 4029 2000-2001 plume and dredge only
SWIR, D50B active, inferred mid-ocean ridge SWIR -52.4200 12.7480 3913 2000-2001 plume and dredge only
SWIR, D36 active, inferred mid-ocean ridge SWIR -52.7490 11.7110 3981 2000-2001 plume and dredge only
SWIR, D20 active, inferred mid-ocean ridge SWIR -53.0200 22.1880 4170 2000-2001 plume and dredge only
SWIR, 63.9 E active, inferred mid-ocean ridge SWIR -27.8510 63.9230 2759 2009 DY115-20 Leg 7 (need reference to confirm activity)
SWIR, 53.2 E active, inferred mid-ocean ridge SWIR -36.1010 53.2550 2218 2008 plume and dredge only
SWIR, 51.7 E active, inferred mid-ocean ridge SWIR -37.4660 51.7320 1595 2008 plume and dredge only
SW Syoyo active, inferred arc volcano Mariana Arc 22.3870 142.7620 1750 2003 plume only
SuSu Knolls active, confirmed back-arc spreading center Manus Basin -3.8000 152.1000 1520 1996 towed camera/video; 1993 plume only
Sumisu Rift active, inferred back-arc spreading center Izu-Bonin back-arc 31.1000 139.8917 1600 1987 submersible Alvin inactive chimneys only
Sumisu Caldera active, confirmed arc volcano Izu-Bonin Arc 31.4667 140.0667 690 1998 submersible Shinkai 2000
Suiyo Seamount active, confirmed arc volcano Izu-Bonin Arc 28.5750 140.6417 1380 1991 submersible Shinkai 2000
Suakin Deep active, inferred mid-ocean ridge Red Sea 19.6333 38.7333 2850 1972 deposits only
Su Causeway active, inferred mid-ocean ridge SWIR -38.1000 48.6000 3000 2014 leg 2 or 3 of the 30th Chinese Cruise
Stromboli active, inferred arc volcano Aeolian Arc, Tyrrhenian Sea 38.7890 15.2130 250 1969 Fe crusts only
Stockwork active, inferred mid-ocean ridge JdF Ridge 47.9000 -129.1240 2300 2005 submersible Alvin (need publication to determine if confirmed)
Steinaholl Vent Field active, confirmed mid-ocean ridge Reykjanes Ridge 63.1000 -24.5333 350 1990 plume, echosounding, and towed video; 1993 plume only (included echosounding for more precise location)
Stealth active, confirmed mid-ocean ridge S EPR -17.6167 -113.2330 2600 1996 Argo II towed video; 1993 plume only; 1998 submersible Alvin
Station 58, N160 Axis active, inferred back-arc spreading center North Fiji Basin -16.3167 173.5500 3900 1985 plume only; 1991 temperature anomalies but submersible Shinkai 6500 did not confirm activity
Starfish Seamount, Tinakula active, confirmed back-arc spreading center New Hebrides back-arc -12.2028 167.6139 1204 2011 commercial ROV; 1989 plume only; 1989 towed camera survey did not confirm activity; 2002 plume and dredge only
Stanton Seamount active, confirmed arc volcano New Hebrides Arc -10.8670 166.7000 800 2002 towed video
Squid Forest inactive mid-ocean ridge Kolbeinsey Ridge 68.0000 -17.5000 900 1999 ROV Aglantha
SPOT, Yonaguni Knoll IV active, confirmed back-arc spreading center Okinawa Trough 24.8490 122.7000 1385 2000 submersibles Shinkai 2000 and Shinkai 6500
SPOT, Hatoma Knoll active, confirmed back-arc spreading center Okinawa Trough 24.8550 123.8410 1520 1999 submersible Shinkai 2000
Split Seamount active, inferred mid-ocean ridge JdF Ridge 47.6400 -128.9667 2350 1990 camera tow (need reference to check if activity confirmed)
South Sarigan Seamount active, inferred arc volcano Mariana Arc 16.5800 145.7800 240 2013 ROV HyperDolphin (did not confirm activity)
South Kurchatov active, inferred mid-ocean ridge N MAR 40.4670 -29.5500 2900 1992 plume only; 1995 plume only
South Cleft active, confirmed mid-ocean ridge JdF Ridge 44.6667 -130.3667 2250 1981 deep-tow photographs; 1984 submersible Alvin
Source active, confirmed mid-ocean ridge JdF Ridge 46.1550 -129.8100 2055 1993 submersible Alvin
Soria Moria active, confirmed mid-ocean ridge Mohns Ridge 71.2593 -5.8146 750 2005 ROV BIODEEP-05 cruise
Sonne 99 active, confirmed back-arc spreading center North Fiji Basin -16.9500 173.9167 1980 1995 deep tow video and TV-grab
Sonne active, inferred arc volcano Kermadec Arc -34.0580 179.5890 1127 2002 plume only
Solwara 19 active, inferred back-arc spreading center Manus Basin -3.6660 148.7640 1039 2009 commercial ROV Fugro FV300 (activity not confirmed)
Solwara 18 active, inferred back-arc spreading center Manus Basin -3.0760 147.2390 1308 2008 plumes with some sites subsequently observed with ROV; 2009 commercial ROV Fugro FV300 (activity not confirmed)
Solwara 17 active, confirmed back-arc spreading center Manus Basin -3.0380 147.5280 535 2009 commercial ROV Fugro FV300; 2008 plumes with some sites subsequently observed with ROV
Solwara 16 active, inferred back-arc spreading center Manus Basin -3.4380 149.9670 2163 2009 commercial ROV Fugro FV300 (activity not confirmed)
Solwara 13 active, confirmed back-arc spreading center Manus Basin -3.7320 151.7465 2000 2009 commercial ROV Fugro FV300; 1993 plume only
Solwara 12 inactive back-arc spreading center Manus Basin -3.7086 151.8834 1920 2009 commercial ROV Fugro FV300 inactive
Solwara 11 active, confirmed back-arc spreading center Manus Basin -3.1667 147.1917 1500 2008 commercial ROV; 2000 submersible Nautile did not confirm activity
Solitaire Field active, confirmed mid-ocean ridge CIR -19.5450 65.8500 2630 2009 submersible Shinkai 6500; 2006 plume only
Snake Pit active, confirmed mid-ocean ridge N MAR 23.3683 -44.9500 3500 1985 real-time TV and imaging sonar; earlier in 1985 seafloor photographs did not confirm activity
Snail active, confirmed back-arc spreading center Mariana Trough 12.9533 143.6200 2880 2003 ROV Jason II; 2003 plume only
Sisifo active, inferred arc volcano Aeolian Arc, Tyrrhenian Sea 38.7833 13.8666 1200 2007 plume only
Si'iSi'i active, confirmed back-arc spreading center Lau Basin -22.2900 -176.6290 1950 2008 commercial ROV; 2003 plume only
Shinkurose Bank inactive arc volcano Izu-Bonin Arc 33.5667 140.1667 200 1992 or earlier submersible Shinkai 2000
Shaban Deep active, inferred mid-ocean ridge Red Sea 26.2250 35.3500 1540 1983 deposits only
Seven Sisters active, inferred mid-ocean ridge Kolbeinsey Ridge 71.1500 -12.7900 2200 2012 plume only; 2013 ROV Aglantha (may have confirmed); 2013 plume only
SESCA active, inferred mid-ocean ridge Gorda Ridge 40.7500 -127.5200 3300 1986 sediments and heat-flow measurements
Semyenov-2 active, confirmed mid-ocean ridge N MAR 13.5137 -44.9630 2440 2009 TV grab and photo-TV profiling; 2007 deposits only
SEIR-WXC27 active, inferred mid-ocean ridge SEIR -50.4000 134.3000 2760 2015 plume only
SEIR-WXC25 active, inferred mid-ocean ridge SEIR -50.2500 131.9000 3050 2015 plume only
SEIR-WXC22 active, inferred mid-ocean ridge SEIR -50.2500 132.1000 2950 2015 plume only
SEIR-WXC17 active, inferred mid-ocean ridge SEIR -50.3000 133.8000 2780 2015 plume only
SEIR-WXC15 active, inferred mid-ocean ridge SEIR -50.2500 135.3000 3000 2015 plume only
SEIR-WXC12 active, inferred mid-ocean ridge SEIR -50.2500 136.2500 2780 2015 plume only
SEIR-WXC07 active, inferred mid-ocean ridge SEIR -50.2500 138.3000 2420 2015 plume only
SEIR-WXC06 active, inferred mid-ocean ridge SEIR -50.2500 138.5500 2400 2015 plume only
SEIR-WXC02 active, inferred mid-ocean ridge SEIR -50.2500 137.0000 2620 2015 plume only
SEIR inactive mid-ocean ridge SEIR -28.0614 74.1733 5000 NotProvided
Secca del Capo active, inferred arc volcano Aeolian Arc, Tyrrhenian Sea 38.6333 14.8500 240 1995 ROV Comex deposits only; 2007 plume only
seamount, Tikopia area active, inferred arc volcano New Hebrides Arc -12.5433 167.7883 1425 1991 submersible Cyana
Seamount X active, confirmed arc volcano Mariana Arc 13.2500 144.0200 1450 1994 or earlier submersible Shinkai 6500
Sea Cliff active, confirmed mid-ocean ridge Gorda Ridge 42.7550 -126.7083 2800 1988 submersible Sea Cliff; 1985 plume only; 1986 dredge and camera tow did not confirm activity
Sasquatch Field active, confirmed mid-ocean ridge JdF Ridge 47.9969 -129.0662 2200 2000 submersible Alvin
Santorini active, confirmed arc volcano Hellenic Arc, Aegean Sea 36.4333 25.4000 400 1960's, likely by SCUBA; 2006 deeper vents HOV Thetis and AUV SeaBED
Sangeang Island active, confirmed arc volcano Banda/Sunda Arc -8.1300 119.0900 2 1991 or earlier, from beach
San Felipe active, inferred other Coastal Baja California 31.0000 -114.8000 1 1982 or earlier, likely from shore
San Cristobal arc, Target N active, inferred arc volcano Solomons Arc -10.5000 164.0000 2000 2002 dredge only
San Cristobal arc, Target M active, inferred arc volcano Solomons Arc -10.4000 164.7500 2000 2002 plume and dredge only
Salty Dawg Field active, confirmed mid-ocean ridge JdF Ridge 47.9822 -129.0756 2200 1995 submersible Alvin, followed by ROV ROPOS
Saldanha active, confirmed mid-ocean ridge N MAR 36.5667 -33.4333 2300 1998 submersible Nautile
Sakai active, confirmed back-arc spreading center Okinawa Trough 27.5481 126.9895 1600 1988 submersible Shinkai 2000; 1987 plume only
Saguaro Field active, confirmed mid-ocean ridge S EPR -31.8500 -112.0333 2330 1999 submersible Alvin; 1998 plume only
S-OH2 active, inferred mid-ocean ridge N MAR 34.0670 -37.4830 3250 2000 or earlier plume only
S-OH1 active, inferred mid-ocean ridge N MAR 34.5330 -36.8500 3000 1996 submersible Nautile did not find active vents; 2000 or earlier plume only
S Oceanographer active, inferred mid-ocean ridge N MAR 34.8670 -36.4330 3460 1992 plume only
S AMAR 2 active, inferred mid-ocean ridge N MAR 35.9670 -34.1830 2240 1992 plume only; 1994 plume only
S AMAR 1 active, inferred mid-ocean ridge N MAR 36.0830 -34.0830 2630 1992 plume only; 1994 plume only
Rumble V volcano active, confirmed arc volcano Kermadec Arc -36.1333 178.1833 755 2001 towed camera; 1999 plume and dredged mussel shells
Rumble III volcano active, confirmed arc volcano Kermadec Arc -35.7333 178.4667 380 2000 towed camera; 1999 plume only
Rumble II West active, inferred arc volcano Kermadec Arc -35.3600 178.5170 1500 1996 dredging only; 1999 plume only
Ruby active, confirmed arc volcano Mariana Arc 15.6200 145.5700 214 2006 ROV Jason II; 2003 plume only
Rose Garden active, confirmed mid-ocean ridge Galapagos Rift 0.8058 -86.2267 2550 1977 submersible Alvin; 1976 plume and photographs of clam shells did not confirm activity (note: Rose Garden is used here as the name of the vent field, but Rose Garden vent site itself not discovered until 1979)
Romanche Fracture Zone inactive mid-ocean ridge S MAR -0.9767 -24.5133 3100 NotProvided
Ringvent active, confirmed mid-ocean ridge Gulf of California 27.5083 -111.6792 1740 2016 submersible Alvin; 2009 towed camera/CTD/bottles
Ribeira Quente active, confirmed mid-ocean ridge Terceira Rift 37.7250 -25.3160 10 1986 or earlier, likely from shore or by SCUBA
Reykjanes Ridge, Area B active, inferred mid-ocean ridge Reykjanes Ridge 59.8167 -29.6833 1000 1992 submersible Mir did not find vents
Reykjanes Ridge, Area A active, inferred mid-ocean ridge Reykjanes Ridge 62.4500 -25.4330 500 NotProvided
Rehu-Marka active, confirmed mid-ocean ridge S EPR -17.4333 -113.2000 2590 1993 submersible Nautile; 1984 submersible Cyana - Auzende et al. (1996) says that no active black smokers were discovered but Krasnov et al. (1997) says one black smoker observed
Red Seamount active, confirmed mid-ocean ridge N EPR 20.8033 -109.3783 2000 1982 submersible Alvin
Red Sea Rift, 18 N active, inferred mid-ocean ridge Red Sea 17.9667 40.0667 1500 1980 submersible Pisces XI (deposits only)
Rapa Nui active, confirmed mid-ocean ridge S EPR -21.5620 -114.3000 2845 1999 submersible Alvin; 1987-1988 deposits only
Rakahore volcanic center active, inferred arc volcano Kermadec Arc -26.8100 -177.4000 1200 2004 plume and dredging NZAPLUME III expedition
Rainbow Bay active, inferred mid-ocean ridge S MAR -14.0300 -14.3400 2900 2009 towed video did not confirm activity
Rainbow active, confirmed mid-ocean ridge N MAR 36.2300 -33.9020 2320 1997 submersible Nautile
Puy des Folles active, inferred mid-ocean ridge N MAR 20.5083 -45.6417 2000 1996 submersible Nautile observed only inactive vents
Putoto volcanic center active, inferred arc volcano Kermadec Arc -27.6800 -177.6100 700 2004 plume and dredging NZAPLUME III expedition
Punta Mita, Bahia de Banderas active, confirmed other Coastal Mexico 20.7700 -105.5200 10 1997 photo/video most likely by SCUBA
Punta Banda active, confirmed other Coastal Baja California 31.7500 -116.7500 30 1960's commercial abalone divers
Pulau Weh active, confirmed arc volcano Banda/Sunda Arc 5.8166 95.3000 8 1982 or earlier, likely by SCUBA
Prony Bay active, confirmed other -22.3333 166.8333 50 1979 or earlier, likely SCUBA
Precious Stone Mountain active, confirmed mid-ocean ridge Galapagos Rift 1.2200 -101.4900 1700 2009 deep-tow video and TV grab
Pobeda-1 active, inferred mid-ocean ridge N MAR 17.1500 -46.4200 3100 2014/2015 video profiling, TVgrab and corer
Pito Seamount active, confirmed mid-ocean ridge S EPR -23.3275 -111.6402 2270 1993 submersible Nautile
Pika active, confirmed back-arc spreading center Mariana Trough 12.9183 143.6483 2990 2003 submersible Shinkai 6500; 2003 plume only
Piip Submarine Volcano active, confirmed arc volcano Aleutian Arc, western 55.4167 167.2717 500 1990 Mir submersible; 1981 R/V "Vulcanolog" cruise; 1987 (or 1986) echo-sounder fluid discharge
Philippine Ridge, West Philippine Basin inactive back-arc spreading center West Philippine Basin 12.0000 131.4170 5800 NotProvided
Petersburgskoe inactive mid-ocean ridge N MAR 19.8666 -45.8666 3100 2010 dredging only
Pescadero Basin, Auka active, confirmed mid-ocean ridge Gulf of California 23.9567 -108.8618 3685 2015 ROV Doc Ricketts; 1990 or earlier plume only
Perseverance active, confirmed back-arc spreading center Mariana Trough 15.4802 144.5077 3935 2016 ROV SuBastian; 2015 AUV Sentry plume mapping
Pere Lachaise inactive back-arc spreading center North Fiji Basin -16.9667 173.9333 2000 1989 submersible Nautile did not find activity; 1991 submersible Shinkai 6500 did not find activity
Peggy Ridge active, inferred back-arc spreading center Lau Basin -16.9233 -176.8250 1900 1975 or earlier rock samples only; inactive in systematic survey on Arculus cruise SS07/2008
Pegasus active, confirmed mid-ocean ridge Galapagos Rift 0.7500 -88.2000 2000 2011 ROV Little Hercules
Parece Vela Ridge, Philippine Sea inactive back-arc spreading center Parece Vela Basin 16.0000 139.1667 5000 NotProvided
Paramushir Island inactive arc volcano Kuril Arc 50.3300 155.5000 800 NotProvided
Panarea active, confirmed arc volcano Aeolian Arc, Tyrrhenian Sea 38.6583 15.1000 200 1800's shallow vents; 1995 deeper vents ROV Comex
Palinuro active, confirmed arc volcano Aeolian Arc, Tyrrhenian Sea 39.5500 14.7000 1000 2006 ROV Cherokee; 1968 manganese crust only; 1984 deposits only; 1993 TV profile did not confirm
PACMANUS field active, confirmed back-arc spreading center Manus Basin -3.7250 151.6700 1800 1991 deep-tow camera and video; 1995 submersible Shinkai 6500
Pacific-Antarctic Ridge, 64 S segment active, inferred mid-ocean ridge Pacific-Antarctic Ridge -64.5000 -170.0000 2300 2009 plume only
Pacific-Antarctic Ridge, 60 S segment active, inferred mid-ocean ridge Pacific-Antarctic Ridge -60.0000 -152.0000 2300 2009 plume only
Owen transform fault inactive mid-ocean ridge Carlsberg Ridge 9.8333 57.9500 4500 NotProvided
Omuro Hole active, confirmed arc volcano Izu-Bonin Arc 34.5467 139.4417 200 2012 ROV Hyper-Dolphin
Okinawa Trough, Site ES2 active, inferred back-arc spreading center Okinawa Trough 28.8137 128.1028 779 1992 dredge only
Okinawa Trough, Site ES1 active, inferred back-arc spreading center Okinawa Trough 30.3303 129.0827 521 1992 dredge only
NWLSC, Southern Caldera active, inferred back-arc spreading center Lau Basin -15.9000 -177.4166 2160 2008 plume only
NWLSC, Central Caldera active, inferred back-arc spreading center Lau Basin -15.8000 -177.2666 2200 2008 plume and dredge only
Not Dead Yet active, confirmed mid-ocean ridge JdF Ridge 46.6899 -129.3772 2419 2007 ROV Jason II; 1991 camera tow did not confirm activity
Northwest Rota-1 volcano active, confirmed arc volcano Mariana Arc 14.6010 144.7750 599 2004 ROV ROPOS; 2003 plume only
Northwest Eifuku active, confirmed arc volcano Mariana Arc 21.4850 144.0430 1604 2004 ROV ROPOS; 2003 plume only
North Knoll, Iheya Ridge active, confirmed back-arc spreading center Okinawa Trough 27.7908 126.8966 1100 1995 deep tow survey
North FAMOUS active, inferred mid-ocean ridge N MAR 36.9670 -32.9670 2500 1994 plume only
North Cleft, low temperature active, confirmed mid-ocean ridge JdF Ridge 44.8833 -130.2667 2250 1987-1989 camera/CTD tows
North Cleft, high temperature active, confirmed mid-ocean ridge JdF Ridge 44.9800 -130.2000 2300 1987 camera/CTD tows discovered low-temperature vents; 1988 submersible Alvin sampled low-temperature vents; 1990 submersible Alvin discovered black smoker
Nolan's Nook active, confirmed mid-ocean ridge S EPR -31.1500 -111.9167 2330 1999 submersible Alvin; 1998 plume only
Niuatahi active, confirmed back-arc spreading center Lau Basin -15.3790 -174.0196 1635 2009 ROV Jason II; 2003 plume only; 2004 dredging (SS11/2004 cruise); 2005 plume only; 2008 commercial ROV (report does not confirm activity)
Niua South active, confirmed arc volcano Tonga Arc -15.1650 -173.5700 1180 2008 commercial ROV
Niua North active, confirmed arc volcano Tonga Arc -15.0667 -173.5667 1375 2012 ROV Quest 4000; 2008 plume only
Nisiros active, confirmed arc volcano Hellenic Arc, Aegean Sea 36.5600 27.1400 18 1994 or earlier, likely by SCUBA
Nishinoshima Island active, inferred arc volcano Izu-Bonin Arc 27.2367 140.8783 5 1975 SCUBA
Nishi-Shichito Ridge inactive arc volcano Izu-Bonin Arc 31.3667 138.7500 1600 NotProvided
Nikko volcano active, confirmed arc volcano Mariana Arc 23.0833 142.3333 600 1992 submersible Shinkai 6500; 1979 first observed discolored water above the seamount
Nifonea Ridge active, confirmed back-arc spreading center New Hebrides back-arc -18.1330 169.5170 1900 2001 towed video; 2013 ROV Kiel 6000 black smokers
Nibelungen active, confirmed mid-ocean ridge S MAR -8.3000 -13.5200 2900 2006 AUV ABE followed by ROV Quest; 2004 plume only
Ngatoroirangi active, inferred arc volcano Kermadec Arc -33.7310 179.8250 467 2002 plume only
New World Seamount active, inferred arc volcano Tabar-Feni Arc -2.8333 152.5333 1200 2000 or earlier (cruise FR04/00 implies that they already suspected hydrothermal activity); 1994 seamount discovered
NESCA active, confirmed mid-ocean ridge Gorda Ridge 41.0000 -127.4917 3300 1988 submersible Alvin; 1986 dredge and photographs did not confirm activity
Nereus Deep active, inferred mid-ocean ridge Red Sea 23.1670 37.2830 2400 1972 deposits only
Neptune's Beard active, inferred mid-ocean ridge N MAR 12.9100 -44.9000 4100 1984 plume only; 2000 TV survey did not confirm activity
NELSC, T08C12 active, inferred back-arc spreading center Lau Basin -15.2179 -174.1788 2000 2008 plume only
NELSC, T08C09 and T08C18 active, inferred back-arc spreading center Lau Basin -15.4030 -174.2630 1800 2008 plume only
near Jade Emperor Mountain, on-axis active, inferred mid-ocean ridge SWIR -37.8666 49.2166 3000 2010 plume only
NE Pual active, confirmed back-arc spreading center Manus Basin -3.6754 151.7272 1875 2006 ROV Jason II
NE Anatahan submarine volcano active, inferred arc volcano Mariana Arc 16.3750 145.7250 460 2003 multibeam and sidescan sonar only
Navidad active, confirmed mid-ocean ridge Galapagos Rift 2.5300 -94.0750 2380 2005 towed video Medea
Naung active, inferred arc volcano Sangihe Arc 3.7791 125.3750 600 2001 dredge only, 2003 CTD only
Natsushima 84-1 Knoll active, confirmed back-arc spreading center Okinawa Trough 27.5750 127.1417 1600 1986 submersible Shinkai 2000
Nagahama Bay, Iwo-dake Volcano active, confirmed arc volcano Ryukyu Arc 30.7500 130.3330 26 1994 or earlier intertidal; 2008 or earlier SCUBA subtidal
N-ELSC, plume 29 active, inferred back-arc spreading center Lau Basin -19.6000 -175.9750 2700 2004 plume only
N-ELSC, plume 28 active, inferred back-arc spreading center Lau Basin -19.6500 -175.9890 2550 2004 plume only
N-ELSC, plume 27 active, inferred back-arc spreading center Lau Basin -19.7500 -176.0190 2570 2004 plume only; 2009 plume only
N-ELSC, plume 26 active, inferred back-arc spreading center Lau Basin -19.8200 -176.0420 2600 2004 plume only
N-ELSC, plume 25 active, inferred back-arc spreading center Lau Basin -19.8900 -176.0640 2680 2004 plume only
N-ELSC, plume 22 active, inferred back-arc spreading center Lau Basin -20.4000 -176.1580 2700 2004 plume only
N Oceanographer active, inferred mid-ocean ridge N MAR 35.2830 -34.8670 2600 1992 plume only
Myojinsho Caldera active, inferred arc volcano Izu-Bonin Arc 31.8833 139.9500 1110 1988 deposits only; 2005 plume only
Myojin Knoll active, confirmed arc volcano Izu-Bonin Arc 32.1033 139.8683 1360 1996 submersible Shinkai 2000
Mussel Valley active, confirmed back-arc spreading center North Fiji Basin -18.8167 173.4833 2700 1989 submersible Nautile; 1987 plume; 1988 towed camera did not confirm activity
MTJ, V12A-04 active, inferred back-arc spreading center Lau Basin -15.9540 -174.7110 1330 2012 plume only
MTJ, T08C05 active, inferred back-arc spreading center Lau Basin -15.5134 -174.7407 2100 2008 plume only
MTJ, T08C03, 15.72 S active, inferred back-arc spreading center Lau Basin -15.7186 -174.8338 2400 2008 plume only
MTJ, T08C03 and T08C04 active, inferred back-arc spreading center Lau Basin -15.6100 -174.8200 2300 2008 plume only
MTJ, T08C01 active, inferred back-arc spreading center Lau Basin -15.9629 -174.7961 2400 2008 plume only
MTJ, PAPATUA active, inferred back-arc spreading center Lau Basin -15.3850 -174.6430 2170 1986 PAPATUA Expedition deposits only; 2008 plume only
Moytirra active, confirmed mid-ocean ridge N MAR 45.4833 -27.8500 2900 2011 ROV Holland 1; 2008 plume only MAPRs, ROV Isis buoyant plume, but no visual confirmation
Mount Jourdanne inactive mid-ocean ridge SWIR -27.8500 63.9333 2940 1998 submersible Shinkai 6500
Mounds and Microbes active, confirmed mid-ocean ridge N EPR 9.4500 -104.5383 2950 2002 submersible Alvin; 1994 submersible Alvin did not confirm activity
Mothra Field active, confirmed mid-ocean ridge JdF Ridge 47.9233 -129.1082 2270 1996 ROV ROPOS; 1986 plume only
Montserrat-Marie Galante fault active, inferred arc volcano Lesser Antilles Arc 16.4600 -61.9820 1000 1987 plume and deposits
Montserrat Offshore Springs active, confirmed arc volcano Lesser Antilles Arc 16.7100 -62.2300 10 1996 or earlier (assume SCUBA)
Monowai Cone active, inferred arc volcano Tonga Arc -25.8870 -177.1880 150 1998 R/V Sonne SO-135; 2004 plume only
Monowai Caldera active, confirmed arc volcano Tonga Arc -25.8000 -177.1500 1165 2005 with submersibles PISCES IV and PISCES V and ROV RCV-150; 2004 plume only
Momoko active, inferred back-arc spreading center Lau Basin -22.6400 -176.7210 2180 1989 submersible Nautile
Mokuyo Seamount active, confirmed arc volcano Izu-Bonin Arc 28.3200 140.5800 1200 1990 submersible Shinkai 2000
Mohns Ridge, 72.8 N active, inferred mid-ocean ridge Mohns Ridge 72.8060 4.1650 2300 2013 plume only
Mohns Ridge, 72 N active, inferred mid-ocean ridge Mohns Ridge 72.0390 -0.2520 2500 1987 plume only; 2013 plume only
Misiteli active, confirmed back-arc spreading center Lau Basin -22.4700 -176.7030 2050 2008 commercial ROV; 2003 plume only
Minami-Hiyoshi submarine volcano active, confirmed arc volcano Mariana Arc 23.4970 141.9400 80 2005 ROV HyperDolphin
Minami-Ensei Knoll active, confirmed back-arc spreading center Okinawa Trough 28.3917 127.6417 740 1988 deep tow TV surveys followed by submersible Shinkai 2000; 1986 dredged Calyptogena shells
Milos active, confirmed arc volcano Hellenic Arc, Aegean Sea 36.6667 24.5167 200 1987 or earlier, likely by SCUBA; 1992 Minirover ROV deeper sites
Middle Valley, Dead Dog Vent Field active, confirmed mid-ocean ridge JdF Ridge 48.4560 -128.7088 2450 1990 HOV Alvin
Middle Valley, Bent Hill Massive Sulfide active, confirmed mid-ocean ridge JdF Ridge 48.4341 -128.6812 2440 1990 HOV Alvin, 1985 deposits only
Methana active, confirmed arc volcano Hellenic Arc, Aegean Sea 37.6150 23.3360 10 nearshore: since antiquity; offshore: 1997 SCUBA
MESO Zone inactive mid-ocean ridge CIR -23.3927 69.2422 2850 1993 TV grab and water column measurements
Merian active, inferred mid-ocean ridge S MAR -26.0166 -13.8500 2550 2012 R/V Dayang Yihao; 2013 AUV Abyss plume and side-scan data
Menez Hom active, confirmed mid-ocean ridge N MAR 37.1500 -32.4333 1802 2002 ROV Victor 6000
Menez Gwen active, confirmed mid-ocean ridge N MAR 37.8417 -31.5250 865 1994 submersible Nautile
Medusa active, confirmed mid-ocean ridge N EPR 9.1404 -104.2065 2580 2007 ROV Jason II; 1991 plume only
Maug Caldera active, confirmed arc volcano Mariana Arc 20.0200 145.2200 145 2003 SCUBA shallow vents; 2004 ROV ROPOS deeper vents; 2003 plume only deeper vents
Matupi Harbour, Rabaul caldera, New Britain Island active, confirmed arc volcano Bismarck Arc -4.2700 152.2000 30 1961 or earlier intertidal
Mata Ua active, confirmed arc volcano Lau Basin -15.0166 -173.7833 2397 2012 ROV Quest 4000; 2010 plume only (towed camera did not confirm)
Mata Tolu active, confirmed arc volcano Lau Basin -15.0049 -173.7936 1900 2010 towed camera; 2009 plume and dredge only
Mata Taha active, inferred arc volcano Lau Basin -15.0416 -173.7833 2160 2010 plume only
Mata Ono active, inferred arc volcano Lau Basin -14.9333 -173.7916 2600 2010 plume only
Mata Nima inactive arc volcano Lau Basin -14.9583 -173.7833 2670 2010 no plume detected
Mata Fitu active, confirmed arc volcano Lau Basin -14.9166 -173.7833 2750 2010 towed camera
Mata Fa active, inferred arc volcano Lau Basin -14.9833 -173.8000 2600 2010 plume only
Marsili active, confirmed back-arc spreading center Tyrrhenian Back-Arc Basin, Tyrrhenian Sea 39.2600 14.3780 800 2006 ROV Cherokee; 1989 shimmering water but did not confirm activity
Markov Deep active, inferred mid-ocean ridge N MAR 5.9100 -33.1800 3500 2001-2002 and 2003 dredge only
Mariner active, confirmed back-arc spreading center Lau Basin -22.1800 -176.6017 1910 2003 plume and camera tow; 2004 submersible Shinkai 6500
Mariana Trough, plume 2 active, inferred back-arc spreading center Mariana Trough 12.7610 143.4730 2950 2003 plume only
Mariana Trough, Central Trough active, confirmed back-arc spreading center Mariana Trough 18.0467 144.7533 3676 1987 submersible Alvin
Mariana Trough, 18.2 N active, inferred back-arc spreading center Mariana Trough 18.1080 144.7380 3916 2015 plume only
Mariana Trough, 16.5 N active, inferred back-arc spreading center Mariana Trough 16.4010 144.8700 3829 2015 plume only
Mariana Trough, 15.5 N active, confirmed back-arc spreading center Mariana Trough 15.4080 144.5090 4196 2015 plume only, 2016 ROV did not confirm
Mariana Trough, 14.5 N active, inferred back-arc spreading center Mariana Trough 14.4870 144.0940 4120 2015 plume only
Mariana Mounds active, confirmed back-arc spreading center Mariana Trough 18.0333 144.2833 3600 1987 submersible Alvin
MAR, south of 15 20'N fracture zone active, inferred mid-ocean ridge N MAR 15.0833 -45.0000 3000 1988 plume only; 1992 submersible Nautile did not observe active vents
MAR, segment south of St. Paul system active, inferred mid-ocean ridge N MAR 0.5000 -25.0000 3500 2013 plume only
MAR, 8 10'S active, inferred mid-ocean ridge S MAR -8.1670 -13.4670 2000 2001 plume only
MAR, 7 57'S active, inferred mid-ocean ridge S MAR -7.9500 -13.4420 2600 2001 plume only
MAR, 43 N active, inferred mid-ocean ridge N MAR 43.0000 -29.0000 3400 1986 or earlier plume only
MAR, 4 48'S active, confirmed mid-ocean ridge S MAR -4.8058 -12.3742 3050 2005 AUV ABE (cruise CD169 ) followed by ROV Quest (cruise M64/1)
MAR, 4 02'S active, inferred mid-ocean ridge S MAR -4.0333 -12.2500 4000 2005 plume only
MAR, 33 S active, inferred mid-ocean ridge S MAR -32.9676 -14.4517 2600 2013 plume only
MAR, 31 S active, inferred mid-ocean ridge S MAR -31.7377 -13.3772 3050 2013 plume only
MAR, 30.8 S active, inferred mid-ocean ridge S MAR -30.8327 -13.4690 2950 2013 plume only
MAR, 30 S active, inferred mid-ocean ridge S MAR -29.9505 -13.8545 3379 2013 plume only
MAR, 30 N active, inferred mid-ocean ridge N MAR 30.0333 -42.5000 3400 1993 plume only
MAR, 28 S active, inferred mid-ocean ridge S MAR -27.7936 -13.3730 3217 2013 plume only
MAR, 27 S active, inferred mid-ocean ridge S MAR -27.1476 -13.4753 3341 2013 plume only
MAR, 27 N active, inferred mid-ocean ridge N MAR 27.0000 -44.5000 2900 1993 plume only
MAR, 25 S active, inferred mid-ocean ridge S MAR -25.3350 -13.6305 2570 2013 plume only
MAR, 25 50'N inactive mid-ocean ridge N MAR 25.8083 -44.9833 3000 NotProvided
MAR, 24 30'N inactive mid-ocean ridge N MAR 24.5000 -46.1533 3900 1987 deposits only
MAR, 24 20'N inactive mid-ocean ridge N MAR 24.3500 -46.2000 3200 NotProvided
MAR, 23 S active, inferred mid-ocean ridge S MAR -23.7428 -13.3936 2880 2013 plume only
MAR, 23 35'N inactive mid-ocean ridge N MAR 23.5833 -45.0000 3500 1980 submersible Alvin did not observe hydrothermal activity
MAR, 22 30'N inactive mid-ocean ridge N MAR 22.5000 -45.0050 2800 NotProvided
MAR, 19 S active, inferred mid-ocean ridge S MAR -19.3301 -11.9421 2707 2013 plume only
MAR, 17 S active, inferred mid-ocean ridge S MAR -17.2522 -14.2270 3280 2013 plume only
MAR, 16 46'N inactive mid-ocean ridge N MAR 16.7950 -46.3800 3300 NotProvided
MAR, 15 50'N inactive mid-ocean ridge N MAR 15.8667 -46.6667 3000 NotProvided
MAR, 14 54'N active, inferred mid-ocean ridge N MAR 14.9200 -44.9000 3500 1988 or earlier seafloor photographs did not confirm hydrothermal activity
MAR, 12 48'N inactive mid-ocean ridge N MAR 12.8000 -44.7883 2400 NotProvided
MAR, 11 N active, inferred mid-ocean ridge N MAR 11.0380 -43.6483 4010 1984 plume only; 2009 plume only
MAR, 11 26'N active, inferred mid-ocean ridge N MAR 11.4482 -43.7035 3835 2009 plume only
Manuk Island active, confirmed arc volcano Banda/Sunda Arc -5.5300 130.2920 2
Makhahnas active, inferred arc volcano Mariana Arc 20.5300 144.8833 420 2003 no plume detected
Maka active, confirmed back-arc spreading center Lau Basin -15.4217 -174.2850 1660 2008 commercial ROV; 2004 plume only; 2006 plume and chimney samples
Main Endeavour Field active, confirmed mid-ocean ridge JdF Ridge 47.9487 -129.0981 2220 1984 submersible Alvin; 1982 dredge only
Magic Mountain, 3-km south active, inferred mid-ocean ridge Explorer Ridge 49.7250 -130.2667 1850 2002 AUV ABE plume only
Magic Mountain active, confirmed mid-ocean ridge Explorer Ridge 49.7500 -130.2667 1850 1984 submersible Pisces IV
Macdonald Seamount active, confirmed intra-plate volcano Central Pacific -28.9833 -140.2500 150 1989 submersible Cyana
Macauley Caldera active, confirmed arc volcano Kermadec Arc -30.2140 -178.7210 500 2002 towed camera TAN0205 cruise
Luso active, confirmed mid-ocean ridge N MAR 38.9833 -29.8833 570 2018 ROV Luso
Luise Harbor, Lihir Island active, confirmed arc volcano Tabar-Feni Arc -3.1167 152.6500 30 1990 or earlier
Lucky Strike segment, southern end active, inferred mid-ocean ridge N MAR 37.0500 -32.4200 2600 1994 plume only
Lucky Strike active, confirmed mid-ocean ridge N MAR 37.2933 -32.2733 1740 1993 submersible Alvin; 1992 dredge and plume only
Lucky B active, inferred mid-ocean ridge Lena Trough 81.3610 -3.4400 4000 1999 dredging only
Lost City active, confirmed mid-ocean ridge N MAR 30.1250 -42.1183 800 2000 towed video ARGO-II and submersible Alvin
Longqi active, confirmed mid-ocean ridge SWIR -37.7838 49.6494 2785 2007 towed video sled followed by AUV ABE; 2005 plume only
Loki's Castle active, confirmed mid-ocean ridge Mohns Ridge 73.5500 8.1500 2400 2008 ROV Bathysaurus
Loihi Seamount active, confirmed intra-plate volcano Central Pacific 18.9500 -155.2500 4800 1985 bottom photography R/V Hakuho Maru; 1987 submersible Alvin
Logatchev-5 inactive mid-ocean ridge N MAR 14.7500 -44.9700 3100 2007 ROV VICTOR 6000 did not find hydrothermal activity
Logatchev-4 inactive mid-ocean ridge N MAR 14.7063 -44.9083 2000 2004 TV sled observed inactive field [ROV QUEST was also on this cruise, but Kuhn et al. (2004) do not report its use at Logatchev-4]
Logatchev-3 active, inferred mid-ocean ridge N MAR 14.7083 -44.9667 3100 1993-1999 (between these dates)
Logatchev-2 active, confirmed mid-ocean ridge N MAR 14.7200 -44.9380 2760 2007 ROV VICTOR 6000; 1993-1994 TV grab and towed photo system did not confirm activity; 1996-1998 video imaging and sampling did not confirm activity
Logatchev-1 active, confirmed mid-ocean ridge N MAR 14.7520 -44.9785 3050 1993-1994 TV grab and towed photo system; 1995 submersible Mir followed by submersible Nautile
Lobster active, inferred back-arc spreading center Lau Basin -15.3330 -176.2830 1500 2008 plume and dredge only
Little Volcano active, inferred back-arc spreading center Bransfield Strait -62.7500 -59.2500 1500 1995 plume only
Lilliput active, confirmed mid-ocean ridge S MAR -9.5500 -13.1800 1500 2005 ROV Quest
Leyte active, inferred arc volcano Luzon/Bicol Arc 11.5000 124.7000 2002 or earlier some indications of activity
Lembeh Strait active, confirmed arc volcano Sangihe Arc 1.8000 125.2000 3 NotProvided
Landing Stage active, inferred mid-ocean ridge SWIR -37.5000 51.0000 2300 2014 leg 2 or 3 of the 30th Chinese Cruise
Kuwae submarine caldera active, inferred arc volcano New Hebrides Arc -16.8300 168.5300 484 2001 plume and inconclusive grab samples
Kurose Hole inactive arc volcano Izu-Bonin Arc 33.4000 139.6800 760 1989 inactive; 2009 inactive
Kulo Lasi active, confirmed back-arc spreading center Lau Basin -14.9200 -177.2500 1478 2010 submersible Nautile
Kuiwai active, inferred arc volcano Kermadec Arc -33.1560 -179.9560 630 2002 plume only
Kueishan Island, offshore active, confirmed back-arc spreading center Okinawa Trough 24.8333 122.0000 1200 2008 or earlier
Kueishan Island active, confirmed back-arc spreading center Okinawa Trough 24.8333 121.9500 30 1999, likely by SCUBA
Kraternaya Bight, Ushishir Volcano active, confirmed arc volcano Kuril Arc 47.5167 152.8000 60 1985 SCUBA
Krasnov inactive mid-ocean ridge N MAR 16.6400 -46.4750 3900 2002 or earlier plume only; 2004 TV grab indicated inactive; 2007 ROV Victor indicated inactive
Krakatau active, inferred arc volcano Banda/Sunda Arc -6.1020 105.4230 250 2002 CTD/transmissometer and dredge only
Kos, south active, inferred arc volcano Hellenic Arc, Aegean Sea 36.6667 27.2500 450 1997 plume only
Kos active, confirmed arc volcano Hellenic Arc, Aegean Sea 36.8500 27.2500 10 1983 or earlier, likely by SCUBA
Komba-ridge active, inferred arc volcano Banda/Sunda Arc -7.9800 123.8000 1000 2001 CTD temperature anomaly and dredged sulfides
Kolumbo active, confirmed arc volcano Hellenic Arc, Aegean Sea 36.5250 25.4833 500 2006 ROV Hercules
Kolbeinsey Ridge, 69 N active, inferred mid-ocean ridge Kolbeinsey Ridge 68.7581 -16.0000 1200 1980 or earlier sediments only
Kolbeinsey Field active, confirmed mid-ocean ridge Kolbeinsey Ridge 67.0833 -18.7167 110 1988 submersible GEO
Kodakara-jima active, confirmed arc volcano Ryukyu Arc 29.2166 129.3333 10 1993 or earlier, likely by SCUBA
Knipovich Ridge, 77 40'N active, inferred mid-ocean ridge Knipovich Ridge 77.6300 7.5800 3000 2000 plume only
Knipovich Ridge, 76 48'N active, inferred mid-ocean ridge Knipovich Ridge 76.7833 8.0000 3500 1996 temperature anomaly and towed video did not confirm activity
Knipovich Ridge, 75 N active, inferred mid-ocean ridge Knipovich Ridge 74.8000 8.4417 3185 2000 plume only
Kilo Moana active, confirmed back-arc spreading center Lau Basin -20.0532 -176.1336 2620 2004 AUV ABE; 2004 plume only on previous cruise
Kick'em Jenny submarine volcano active, confirmed arc volcano Lesser Antilles Arc 12.2833 -61.6667 265 2003 ROV Eastern Oceanics; 1989 submersible Johnson-Sea-Link II (did not confirm activity); 2001 plume only
Kibblewhite active, inferred arc volcano Kermadec Arc -34.5750 179.2550 1106 2002 plume only
Kemp Caldera active, confirmed arc volcano South Sandwich Arc -59.7000 -28.3166 1420 2010 ROV Isis; 2009 plume only
Kebrit Deep active, inferred mid-ocean ridge Red Sea 24.7233 36.2767 1590 1972 deposits only
Kawio Barat active, confirmed arc volcano Sangihe Arc 4.8133 125.0816 1890 2003 towed video, CTD/transmissometer, and dredge
Kavachi submarine volcano active, inferred arc volcano Solomons Arc -8.9833 157.9667 500 2000 plume only
Kasuga 3 Seamount active, confirmed arc volcano Mariana Arc 21.3833 143.6000 1140 1987 submersible Alvin
Kasuga 2 Seamount active, confirmed arc volcano Mariana Arc 21.6000 143.6167 500 1987 submersible Alvin
Kasuga 1 Seamount inactive arc volcano Mariana Arc 21.7650 143.7100 600 2003 no plume detected
Kana Keoki seamount active, inferred arc volcano Solomons Arc -8.7500 157.0300 650 1993 observations did not confirm activity
Kairei Field active, confirmed mid-ocean ridge CIR -25.3195 70.0400 2460 2000 ROV Kaiko; 1993 plume only
Kaikata Seamount active, confirmed arc volcano Izu-Bonin Arc 26.7000 141.0833 930 1988 submersible Shinkai 2000; 1985 dredge only
Kagoshima Bay active, confirmed arc volcano Ryukyu Arc 31.6583 130.8000 200 1993 towed TV system (Haorimushi site); 2007 ROV Hyper-dolphin (Tagiri site)
Kagamil Island active, confirmed arc volcano Aleutian Arc, western 52.9800 -169.7200 5 2007 SCUBA
Jade Emperor Mountain inactive mid-ocean ridge SWIR -37.9400 49.2600 1500 2010 video sled, plume survey, and geological sampling all suggest inactive
Jaco Scar active, confirmed arc volcano Costa Rica fore arc 9.1175 -84.8397 1790 2009 submersible Alvin
Izena Cauldron active, confirmed back-arc spreading center Okinawa Trough 27.2667 127.0833 1610 1988 submersible Shinkai 2000
Ischia Island, Gulf of Naples active, confirmed other Coastal Italy 40.7306 13.9500 10 1954 or earlier, from the beach
Isafjardardjup bay active, confirmed 66.0500 -22.6500 3 1986 or earlier, likely from shore or by SCUBA
Irinovskoye active, confirmed mid-ocean ridge N MAR 13.3327 -44.9099 3000 2013 ROV Victor6000; 2007 dredge only; 2009 or 2011 did not confirm
Irabu Knoll active, confirmed back-arc spreading center Okinawa Trough 25.2300 124.8800 1850 2000 submersible Shinkai 6500; 1986 seafloor photos did not confirm activity
Iguanas-Pinguinos active, confirmed mid-ocean ridge Galapagos Rift 2.1000 -91.9350 1640 2005 towed video Medea
Hot Beach, Mendeleev Volcano active, confirmed arc volcano Kuril Arc 43.9760 145.7360 1 1990 or earlier, from the beach
Hook Ridge active, confirmed back-arc spreading center Bransfield Strait -62.1940 -57.2745 1080 1997 hot sediment; 1995 plume only; 1999 even hotter sediment
Hinetapeka volcanic center active, inferred arc volcano Kermadec Arc -28.5900 -177.8200 300 2004 plume and dredging NZAPLUME III expedition
Hinepuia volcanic center active, confirmed arc volcano Kermadec Arc -26.3900 -177.2600 300 2013 HOV Shinkai 6500; 2004 plume and dredging NZAPLUME III expedition
Hine Hina active, confirmed back-arc spreading center Lau Basin -22.5300 -176.6970 1900 1989 submersible Nautile
High-Rise Field active, confirmed mid-ocean ridge JdF Ridge 47.9666 -129.0894 2200 1988 submersible Alvin
Higashi-Ensei active, confirmed back-arc spreading center Okinawa Trough 28.4393 128.1724 1220 2016 ROV Kaiko dives 723 and 724
Higa active, confirmed back-arc spreading center Okinawa Trough 26.5550 126.2233 1485 2015 ROV Kaiko
Hess Deep inactive mid-ocean ridge Galapagos Rift 2.2500 -101.5000 5100 NotProvided
Healy volcano active, confirmed arc volcano Kermadec Arc -34.9840 178.9990 1370 2005 submersible Pisces V; 1999 plume only
Hawaiian Ridge inactive intra-plate volcano Central Pacific 15.0000 -157.5000 5000 1987 or earlier
Havre active, confirmed arc volcano Kermadec Arc -31.0970 -179.0340 1505 2015 ROV Jason II; 2002 plume only
Haungaroa active, inferred arc volcano Kermadec Arc -32.6060 -179.6090 1165 2002 plume only
Hafa Adai active, confirmed back-arc spreading center Mariana Trough 16.9570 144.8680 3294 2016 ROV Deep Discoverer; 2015 AUV Sentry plume mapping
Guaymas Basin, Southern Trough active, confirmed mid-ocean ridge Gulf of California 27.0148 -111.4109 2000 1982 submersible Alvin; 1980 DeepTow CTD and dredging
Guaymas Basin, Northern Trough_2 active, confirmed mid-ocean ridge Gulf of California 27.4110 -111.3879 1800 2015 ROV Hybis
Guaymas Basin, Northern Trough inactive mid-ocean ridge Gulf of California 27.3050 -111.5067 2000 1977 submersible Seacliff (hydrothermal deposits only)
Grover Seamount active, confirmed arc volcano Solomons Arc -10.4667 164.2500 600 2002 towed video
Grimsey Field active, confirmed mid-ocean ridge Kolbeinsey Ridge 66.6067 -17.6542 400 1997 submersible Jago
Green Seamount inactive mid-ocean ridge N EPR 20.8033 -109.2833 2000 1982 submersible Alvin observed only inactive
Gorda Ridge, GR-15 active, inferred mid-ocean ridge Gorda Ridge 42.9500 -126.5500 3365 1985 plume only
Gorda Ridge, EP96B active, inferred mid-ocean ridge Gorda Ridge 42.5500 -126.8333 3400 1984 deposits only; 1996 plume only
Gorda Ridge, EP96A active, inferred mid-ocean ridge Gorda Ridge 42.6790 -126.7820 3150 1996 camera/temperature tow followed by ROV did not confirm hydrothermal activity
Gorda Ridge, 41 30'N inactive mid-ocean ridge Gorda Ridge 41.5167 -127.4500 3350 1984 deposits only
Giggenbach volcano active, confirmed arc volcano Kermadec Arc -30.0333 -178.7167 180 2005 submersible PISCES V; 2002 plume only
Gemini-Oscostar Volcanic Complex active, inferred arc volcano New Hebrides Arc -20.9830 170.2830 100 2001 deposits and plume; 2004 plume and sulfide samples
GEISEIR site 9, segment K3 active, inferred mid-ocean ridge SEIR -41.9633 82.0600 2700 2010 plume only
GEISEIR site 8, segment K3 active, inferred mid-ocean ridge SEIR -41.8833 81.9816 2800 2010 plume only
GEISEIR site 7, segment K3 active, inferred mid-ocean ridge SEIR -41.8020 81.8380 2540 1996 plume only; 2010 plume only
GEISEIR site 6, segment K2 active, inferred mid-ocean ridge SEIR -41.6600 81.6617 2600 2007 plume only; 2010 plume only
GEISEIR site 5, segment K1 active, inferred mid-ocean ridge SEIR -41.2420 81.1580 2860 1996 plume only; 2007 plume only
GEISEIR site 4, segment K1 active, inferred mid-ocean ridge SEIR -41.2025 81.0625 2800 2010 plume only
GEISEIR site 38, segment O4 active, inferred mid-ocean ridge SEIR -48.0048 98.8232 2800 2009 plume only
GEISEIR site 37, segment O4 active, inferred mid-ocean ridge SEIR -47.7483 98.1756 2800 2009 plume only
GEISEIR site 36, segment O3 active, inferred mid-ocean ridge SEIR -47.7009 98.0631 2700 2009 plume only
GEISEIR site 35, segment O3 active, inferred mid-ocean ridge SEIR -47.6179 97.8678 2600 2009 plume only
GEISEIR site 34, segment O3 active, inferred mid-ocean ridge SEIR -47.4145 97.4373 2700 2009 plume only
GEISEIR site 33, segment O2 active, inferred mid-ocean ridge SEIR -47.2383 97.1566 2700 2009 plume only
GEISEIR site 32, segment O2 active, inferred mid-ocean ridge SEIR -47.1196 96.8947 2600 2009 plume only
GEISEIR site 31, segment O1 active, inferred mid-ocean ridge SEIR -46.8956 96.5709 2600 2009 plume only
GEISEIR site 30, segment O1 active, inferred mid-ocean ridge SEIR -46.6240 96.0594 2500 2009 plume only
GEISEIR site 3, segment J4 active, inferred mid-ocean ridge SEIR -41.7720 79.7530 2800 1996 plume only
GEISEIR site 29, segment M6 active, inferred mid-ocean ridge SEIR -44.9054 94.9673 2700 2009 plume only
GEISEIR site 28, segment M6 active, inferred mid-ocean ridge SEIR -44.7237 94.6039 2700 2009 plume only
GEISEIR site 27, segment M5 active, inferred mid-ocean ridge SEIR -43.9805 93.4571 2700 2009 plume only
GEISEIR site 26, segment M4 active, inferred mid-ocean ridge SEIR -43.6901 92.8451 2500 2009 plume only
GEISEIR site 25, segment M4 active, inferred mid-ocean ridge SEIR -43.3115 92.1335 2700 2009 plume only
GEISEIR site 24, segment M3 active, inferred mid-ocean ridge SEIR -43.0369 91.0357 2400 2009 plume only
GEISEIR site 23, segment M2 active, inferred mid-ocean ridge SEIR -42.0272 89.2205 2400 2009 plume only
GEISEIR site 22, segment L3 active, inferred mid-ocean ridge SEIR -42.1130 88.0420 2400 1996 plume only; 2009 plume only
GEISEIR site 21, segment L3 active, inferred mid-ocean ridge SEIR -42.0050 87.8808 2400 2010 plume only
GEISEIR site 20, segment L3 active, inferred mid-ocean ridge SEIR -41.9508 87.8008 2400 2010 plume only
GEISEIR site 2, segment J4 active, inferred mid-ocean ridge SEIR -41.2520 79.1030 2800 1996 plume and dredge only
GEISEIR site 19, segment L3 active, inferred mid-ocean ridge SEIR -41.8333 87.6266 2400 2009 GEISEIR 1 and 2010 GEISEIR 2 plume only
GEISEIR site 18, segment L3 active, inferred mid-ocean ridge SEIR -41.7133 87.4375 2500 2010 plume only
GEISEIR site 17, segment L3 active, inferred mid-ocean ridge SEIR -41.6498 87.3481 2500 2010 plume only
GEISEIR site 16, segment L3 active, inferred mid-ocean ridge SEIR -41.5883 87.2615 2500 2010 plume only
GEISEIR site 15, segment L1 active, inferred mid-ocean ridge SEIR -41.2230 86.3892 2500 2010 plume only
GEISEIR site 14, segment L1 active, inferred mid-ocean ridge SEIR -41.0716 86.1550 2700 2010 plume only
GEISEIR site 13, segment L1 active, inferred mid-ocean ridge SEIR -41.0125 86.0608 2800 2010 plume only
GEISEIR site 12, segment K4 active, inferred mid-ocean ridge SEIR -42.6600 83.0366 2600 2010 plume only
GEISEIR site 11, segment K4 active, inferred mid-ocean ridge SEIR -42.5375 82.8266 2600 2010 plume only
GEISEIR site 10, segment K4 active, inferred mid-ocean ridge SEIR -42.4770 82.7100 2500 1996 plume only; 2010 plume only
GEISEIR site 1, segment J2 active, inferred mid-ocean ridge SEIR -39.4400 78.0920 2270 1996 plume only
Gamble volcanic center active, inferred arc volcano Kermadec Arc -27.2000 -177.4100 250 2004 plume and dredging NZAPLUME III expedition
Galapagos Rift, 95.5 W active, inferred mid-ocean ridge Galapagos Rift 2.6700 -95.4500 3200 1990 submersible Alvin did not confirm activity
Galapagos Rift, 95 W inactive mid-ocean ridge Galapagos Rift 2.5000 -95.1667 2600 NotProvided
Galapagos Rift, 94.7 W active, inferred mid-ocean ridge Galapagos Rift 2.6000 -94.7750 2690 2005 plume only
Galapagos Rift, 94.4 W active, inferred mid-ocean ridge Galapagos Rift 2.5300 -94.3300 2400 2005 plume only
Galapagos Rift, 93.7 W active, inferred mid-ocean ridge Galapagos Rift 2.4970 -93.7700 2220 2005 plume only
Galapagos Rift, 85 50'W inactive mid-ocean ridge Galapagos Rift 0.7500 -85.8333 2600 1988 or earlier submersible observations
Galapagos Mounds active, confirmed mid-ocean ridge Galapagos Rift 1.4500 -86.1665 2700 1977 submersible Alvin
Gakkel Ridge, Site 8 active, inferred mid-ocean ridge Gakkel Ridge 86.5333 69.0000 3500 2001 plume only
Gakkel Ridge, Site 7 active, inferred mid-ocean ridge Gakkel Ridge 86.9833 55.5000 3800 2001 plume only
Gakkel Ridge, Site 6 active, inferred mid-ocean ridge Gakkel Ridge 86.5333 43.0000 3000 2001 plume only
Gakkel Ridge, Site 5 active, inferred mid-ocean ridge Gakkel Ridge 86.3500 37.0000 3600 2001 plume only
Gakkel Ridge, Site 3 active, inferred mid-ocean ridge Gakkel Ridge 84.4333 2.1333 4300 2001 plume only
Gakkel Ridge, Site 2 active, inferred mid-ocean ridge Gakkel Ridge 83.8500 -2.0000 3900 2001 plume only
Gakkel Ridge, 85 E active, inferred mid-ocean ridge Gakkel Ridge 85.6500 84.8333 3900 2001 plume only; 2007 towed video did not confirm activity
Gakkel Ridge, 7.5 E active, inferred mid-ocean ridge Gakkel Ridge 85.0167 7.4500 3600 2001 plume only
Futagoyama active, confirmed back-arc spreading center Okinawa Trough 24.8674 123.3081 1270 2016 ROV Kaiko dive 717
Fukujin volcano active, inferred arc volcano Mariana Arc 21.9300 143.4700 1100 1987 deposits only
FRSC, T12A-01 active, inferred back-arc spreading center Lau Basin -17.7850 -174.5260 500 2012 plume only
FRSC, South Central active, inferred back-arc spreading center Lau Basin -16.6667 -174.5167 1820 2004 plume only; 2006 plume and chimney samples; 2009 camera tow and sampling (activity not confirmed)
FRSC, RC 129 and CTD 24 plume sites active, inferred back-arc spreading center Lau Basin -17.0250 -174.5017 1750 2004 plume only; 2004 dredging
FRSC, Fonualei South active, confirmed back-arc spreading center Lau Basin -17.5352 -174.5668 1620 2012 ROV Quest 4000
FRSC, Central active, inferred back-arc spreading center Lau Basin -16.4917 -174.5417 2419 2004 plume only
FRSC, 14b, 16.31 S active, inferred back-arc spreading center Lau Basin -16.3110 -174.5550 2380 2008 plume only
FRSC, 14b, 16.11 S active, inferred back-arc spreading center Lau Basin -16.1150 -174.5680 2250 2008 plume only
FRSC, 11a-3 active, inferred back-arc spreading center Lau Basin -16.7950 -174.5230 2000 2008 plume only
Franklin Seamount active, confirmed back-arc spreading center Woodlark Basin -9.9083 151.8300 2366 1990 submersible Mir
Forecast active, confirmed arc volcano Mariana Arc 13.4000 143.9166 1470 1992 submersible Shinkai 6500
Flow active, confirmed mid-ocean ridge JdF Ridge 46.5250 -129.5783 2390 1993 ROV ROPOS
Floc active, confirmed mid-ocean ridge JdF Ridge 46.3133 -129.7050 2290 1993 DEEPTOW and submersible Alvin
Feather Duster active, confirmed mid-ocean ridge N EPR 10.9267 -103.6767 2520 1984 towed camera and submersible Alvin
Eyjafjördur active, confirmed mid-ocean ridge Kolbeinsey Ridge 65.8500 -18.1333 65 1997, likely by SCUBA
Eye of Mordor Seamount active, inferred mid-ocean ridge Galapagos Rift 1.9410 -91.3100 1555 2005 plume only
Extensional Relay Zone A active, inferred back-arc spreading center North Fiji Basin -16.1667 177.4167 2335 1999 towed camera did not confirm activity
Explorer Deep inactive mid-ocean ridge Explorer Ridge 50.1000 -129.7500 3200 1969, deposits only
Evan active, confirmed mid-ocean ridge N MAR 37.2667 -32.2833 1775 2006 submersible Nautile
Eva active, inferred arc volcano New Hebrides Arc -22.0000 170.7500 1600 2008 plume only
Europa active, inferred mid-ocean ridge Mid-Cayman Rise 18.3500 -81.8500 2400 2009 plume only, not observed on dive with hybrid ROV Nereus
ET active, inferred mid-ocean ridge JdF Ridge 48.1993 -128.9257 2500 NotProvided
ESR, E9 active, confirmed back-arc spreading center East Scotia Ridge -60.0500 -29.9300 2402 2009 towed video; 1999 plume only; 2010 ROV Isis
ESR, E5 active, inferred back-arc spreading center East Scotia Ridge -57.5000 -30.2000 3000 1999 plume only
ESR, E2 active, confirmed back-arc spreading center East Scotia Ridge -56.0917 -30.3250 2641 2009 towed video; 1999 plume only; 2010 ROV Isis
Espalamaca active, confirmed intra-plate volcano 38.5500 -28.6000 50 2010 or earlier likely SCUBA
Esmeralda Bank active, confirmed arc volcano Mariana Arc 14.9667 145.2500 323 1990 towed video and TV-grab; 1978 hydrothermal deposits only
EPR/Tamayo intersection active, inferred mid-ocean ridge N EPR 22.9333 -108.0667 3200 1979 submersible Alvin did not confirm activity
EPR, southern 17 N segment active, inferred mid-ocean ridge N EPR 16.5800 -105.3000 2700 1997 plume only
EPR, southern 16 N segment active, inferred mid-ocean ridge N EPR 15.5000 -105.4000 2300 1997 plume only
EPR, Seamount 5 active, inferred mid-ocean ridge N EPR 13.0000 -103.5000 1100 1988 or earlier camera and/or submersible (need to check reference)
EPR, Ridge 3, 20 40'S active, confirmed mid-ocean ridge S EPR -20.3333 -113.6792 3050 1983 Deep Tow camera
EPR, Ridge 1, 20 40'S active, confirmed mid-ocean ridge S EPR -20.8333 -114.1667 3000 1983 Deep Tow camera
EPR, northern 17 N segment active, inferred mid-ocean ridge N EPR 17.6700 -105.0050 2800 1997 plume only
EPR, mid 17 N segment active, inferred mid-ocean ridge N EPR 17.0000 -105.3800 2750 1997 plume only
EPR, Manzanillo Spreading Segment active, inferred mid-ocean ridge N EPR 18.2500 -106.3000 2600 1997 plume only
EPR, 9 50'N active, confirmed mid-ocean ridge N EPR 9.8300 -104.2900 2520 1989 Argo I towed video
EPR, 9 47'N active, confirmed mid-ocean ridge N EPR 9.7750 -104.2802 2560 1989 Argo I towed video; 1991 submersible Alvin
EPR, 9 40'N active, confirmed mid-ocean ridge N EPR 9.6500 -104.2600 2572 1989 Argo I towed video; 1991 submersible Alvin
EPR, 9 33'N active, confirmed mid-ocean ridge N EPR 9.5583 -104.2500 2574 1989 Argo I towed video; 1991 submersible Alvin
EPR, 9 30'N active, confirmed mid-ocean ridge N EPR 9.5167 -104.2414 2580 1989 Argo I towed video
EPR, 9 17'N active, confirmed mid-ocean ridge N EPR 9.2800 -104.2166 2585 1989 Argo I towed video
EPR, 8 53'N active, inferred mid-ocean ridge N EPR 8.9000 -104.2000 2580 1991 plume only
EPR, 8 38'N active, confirmed mid-ocean ridge N EPR 8.6333 -104.2000 2550 2003 submersible Alvin; 1989 dredge only; 2002 plume only
EPR, 7 S active, inferred mid-ocean ridge S EPR -7.0000 -107.5500 2600 1985/86 or 1989 TV grab
EPR, 7 25'S active, confirmed mid-ocean ridge S EPR -7.4167 -107.8000 2750 1985/86 or 1989 TV grab (need to check references to confirm activity); 1998 submersible Alvin
EPR, 5 S active, inferred mid-ocean ridge S EPR -5.0000 -106.4000 2650 1980's camera tows; 1993 and 1998 plume only; 1998 submersible Alvin did not confirm activity
EPR, 37 48'S Axial Dome active, confirmed mid-ocean ridge Pacific-Antarctic Ridge -37.8000 -110.9167 2200 2001 towed video and TV-grab
EPR, 37 40'S Axial Dome active, confirmed mid-ocean ridge Pacific-Antarctic Ridge -37.6667 -110.8667 2240 1997 video survey L'Atalante (do not know if activity confirmed); 1995 TV survey did not confirm activity; 2001 towed video and TV-grab definitely confirmed
EPR, 31.4 S, Segment E4 active, inferred mid-ocean ridge S EPR -31.4330 -111.9670 2350 1998 plume only
EPR, 30.8 S, Segment E2 active, inferred mid-ocean ridge S EPR -30.7500 -111.8770 2360 1998 plume only
EPR, 30.4 S, Segment E2 active, inferred mid-ocean ridge S EPR -30.3750 -111.7640 2320 1998 plume only
EPR, 30.1 S, Segment E1 active, inferred mid-ocean ridge S EPR -30.1330 -111.7640 2480 1998 plume only
EPR, 3.9 N offset active, confirmed mid-ocean ridge N EPR 3.9170 -102.2330 2875 1989 or earlier Deep Tow photographs (cruise RIFTS or PAPATUA)
EPR, 29.8 S, Segment E1 active, inferred mid-ocean ridge S EPR -29.8000 -111.7300 2580 1998 plume only
EPR, 29.5 S, Segment E1 active, inferred mid-ocean ridge S EPR -29.5000 -111.7200 2580 1998 plume only
EPR, 28.7 S, Segment W4 active, inferred mid-ocean ridge S EPR -28.7000 -112.9880 2350 1998 plume only
EPR, 28.4 S, Segment W4 active, inferred mid-ocean ridge S EPR -28.4170 -112.9640 2350 1998 plume only
EPR, 28.3 S, Segment W3 active, inferred mid-ocean ridge S EPR -28.3000 -112.9830 2220 1998 plume only
EPR, 28 S, Segment W3 active, inferred mid-ocean ridge S EPR -28.0170 -112.9040 2130 1998 plume only
EPR, 27.9 S, Segment W3 active, inferred mid-ocean ridge S EPR -27.8670 -112.9120 2180 1998 plume only
EPR, 27.7 S, Segment W3 active, inferred mid-ocean ridge S EPR -27.7000 -112.9170 2105 1998 plume only
EPR, 26.5 S active, confirmed mid-ocean ridge S EPR -26.4833 -112.6250 2064 1993 submersible Nautile (or earlier)
EPR, 26 10'S active, confirmed mid-ocean ridge S EPR -26.2050 -112.6133 2600 1987 or earlier [need to check Marchig & Gundlach (1987)]; 2005 submersible Alvin did not observe active vents
EPR, 23 50'S active, confirmed mid-ocean ridge S EPR -23.8233 -115.4558 2650 2005 submersible Alvin; 1990 or earlier towed TV camera did not confirm activity
EPR, 23 30'S active, confirmed mid-ocean ridge S EPR -23.5333 -115.5667 2600 1987 or earlier [need to check Marchig & Gundlach (1987)]; 2005 submersible Alvin
EPR, 22 30'S active, inferred mid-ocean ridge S EPR -22.5000 -114.3670 2600 1985/86 or 1989 TV grab (need to check references to confirm activity)
EPR, 21 N active, confirmed mid-ocean ridge N EPR 20.8333 -109.0833 2600 1979 submersible Alvin; 1978 submersible Cyana discovered mineral deposits only
EPR, 21 54'S active, inferred mid-ocean ridge S EPR -21.9000 -114.5000 2800 1987-1988 deposits only [need to check Fouquet et al. (1993) for confirmation]
EPR, 21 40'S active, inferred mid-ocean ridge S EPR -21.6340 -114.3010 2730 1987-1988 deposits only
EPR, 21 25'S active, confirmed mid-ocean ridge S EPR -21.4333 -114.2917 2850 1984 submersible Cyana; 1983 deposits only
EPR, 21 20'S active, inferred mid-ocean ridge S EPR -21.3670 -114.2570 2900 1981 plume only; 1987-1988 deposits only
EPR, 20 S active, inferred mid-ocean ridge S EPR -20.0333 -113.6843 3000 1999 submersible Alvin did not confirm activity
EPR, 20 06'S active, confirmed mid-ocean ridge S EPR -20.1000 -113.7080 3000 1981 Angus camera tow; 1984 submersible Cyana
EPR, 2 S, off-axis active, inferred mid-ocean ridge S EPR -2.0840 -102.8270 3000 2008 plume only
EPR, 2 S active, confirmed mid-ocean ridge S EPR -2.2200 -102.6550 2900 2008 towed video and AUV ABE
EPR, 18 32'S active, confirmed mid-ocean ridge S EPR -18.5550 -113.4160 2647 1993 submersible Nautile
EPR, 18 26'S active, confirmed mid-ocean ridge S EPR -18.4333 -113.3833 2650 1993 submersible Nautile; 1983 seafloor photos, temperature anomalies, and deposits did not confirm activity; 1984 submersible Cyana observed only inactive sites; 1985/86 or 1989 TV grab (need to check references to confirm activity)
EPR, 18 15'S active, confirmed mid-ocean ridge S EPR -18.2500 -113.3500 2680 1993 submersible Nautile
EPR, 18 10'S active, confirmed mid-ocean ridge S EPR -18.1700 -113.3440 2700 1993 submersible Nautile; 1983 temperature and light attenuation anomalies
EPR, 17 S active, inferred mid-ocean ridge S EPR -17.0000 -113.1170 2680 1993 plume only
EPR, 17 56'S active, inferred mid-ocean ridge S EPR -17.9400 -113.3170 2620 1993 plume only
EPR, 17 53'S active, inferred mid-ocean ridge S EPR -17.8800 -113.3000 2610 1993 plume only
EPR, 17 47'S active, inferred mid-ocean ridge S EPR -17.7900 -113.3000 2600 1993 plume only
EPR, 17 44'S active, confirmed mid-ocean ridge S EPR -17.7330 -113.2660 2622 1998 submersible Alvin; 1993 plume only; not explored by Nautile in 1993 or Shinkai 6500 in 1994
EPR, 17 42'S active, inferred mid-ocean ridge S EPR -17.7000 -113.2500 2600 1993 plume only
EPR, 17 34'S active, confirmed mid-ocean ridge S EPR -17.5667 -113.2333 2600 1994 submersible Shinkai 6500; 1996 Argo II towed video
EPR, 17 12'S active, confirmed mid-ocean ridge S EPR -17.2000 -113.1500 2590 1993 submersible Nautile
EPR, 16 43'S active, inferred mid-ocean ridge S EPR -16.7170 -113.0680 2600 1985/86 or 1989 TV grab (need to check references to confirm activity)
EPR, 16 35'S active, inferred mid-ocean ridge S EPR -16.5830 -113.0600 2650 1993 plume only; 1998 submersible Alvin did not confirm activity
EPR, 16 24'S active, inferred mid-ocean ridge S EPR -16.4000 -113.0500 2640 1993 plume only
EPR, 16 08'S active, inferred mid-ocean ridge S EPR -16.1300 -113.0000 2640 1993 plume only
EPR, 15 S active, inferred mid-ocean ridge S EPR -15.0000 -112.7700 2640 1985/86 or 1989 TV grab (need to check references to confirm activity); 1993 plume only
EPR, 15 24'S active, inferred mid-ocean ridge S EPR -15.4000 -112.8350 2640 1993 plume only
EPR, 14 S active, confirmed mid-ocean ridge S EPR -13.9667 -112.4667 2635 1985/86 or 1989 TV grab (need to check references to confirm activity); 1993 plume only; 1994 submersible Shinkai 6500
EPR, 14 N seamount inactive mid-ocean ridge N EPR 14.1500 -104.3667 2600 NotProvided
EPR, 14 35'S active, inferred mid-ocean ridge S EPR -14.5830 -112.6670 2630 1993 plume only
EPR, 14 18'S active, inferred mid-ocean ridge S EPR -14.3000 -112.6670 2630 1993 plume only
EPR, 13 N, SE Seamount inactive mid-ocean ridge N EPR 12.7000 -103.8600 2500 1981 towed camera, dredging, and plume did not confirm activity; 1982 and 1984 submersible Cyana did not confirm activity
EPR, 13 N, Marginal High active, confirmed mid-ocean ridge N EPR 12.7090 -103.9160 2650 1984 submersible Cyana; 1981 towed camera, dredging, and plume did not confirm activity
EPR, 13 N active, confirmed mid-ocean ridge N EPR 12.8333 -103.9500 2630 1982 submersible Cyana; 1981 towed camera, dredging, and plume did not confirm activity
EPR, 11 45'N, OSC active, inferred mid-ocean ridge N EPR 11.7775 -103.8300 2580 1984 Angus camera (or 1985 Argo video) tow with temperature; 1988 submersible Alvin dive #2004 (need reference to confirm activity)
EPR, 11 42'N active, confirmed mid-ocean ridge N EPR 11.7000 -103.8500 2580 1984 Angus camera (or 1985 Argo video) tow with temperature
EPR, 11 30'N active, inferred mid-ocean ridge N EPR 11.4833 -103.7833 2422 1981 towed camera and plume did not confirm activity; 1988 submersible Alvin dive #1996 (need reference to confirm activity)
EPR, 11 24'N active, confirmed mid-ocean ridge N EPR 11.4000 -103.7800 2580 1990 submersible Alvin; 1988 submersible Alvin dive #1994 (need reference to confirm activity)
EPR, 11 18'S active, confirmed mid-ocean ridge S EPR -11.3000 -110.5300 2650 1985/86 or 1989 TV grab (need to check references to confirm activity); 1998 submersible Alvin
EPR, 11 17'N active, confirmed mid-ocean ridge N EPR 11.2833 -103.7583 2560 1984 Angus camera (or 1985 Argo video) tow with temperature
EPR, 11 07'N active, inferred mid-ocean ridge N EPR 11.1330 -103.7800 2580 1988 submersible Alvin dive #1989 (need reference to confirm activity); 1991 plume only
EPR, 10 44.6'N active, confirmed mid-ocean ridge N EPR 10.7433 -103.6500 2580 1985 Argo video tow with temperature
EPR, 10 34'S active, inferred mid-ocean ridge S EPR -10.5667 -110.2800 2900 1985/86 or 1989 TV grab (need to check references to confirm activity)
EPR, 10 08'N active, inferred mid-ocean ridge N EPR 10.1300 -104.3300 2580 1983 towed camera and temperature measurements (no direct observations/sampling of hydrothermal fluid)
EPR, 10 02'N active, confirmed mid-ocean ridge N EPR 10.0330 -104.3300 2560 1992 submersible Alvin
EPR, 1.4 S, off-axis active, confirmed mid-ocean ridge S EPR -1.3690 -102.4560 3000 2008 towed video
EPR, 1 S active, inferred mid-ocean ridge S EPR -0.8000 -102.4600 2800 2005 plume only
EPR 87D1 Seamount inactive mid-ocean ridge N EPR 11.5333 -103.8600 2090 NotProvided
Epi Caldera active, confirmed arc volcano New Hebrides Arc -16.6870 168.4000 320 2013 ROV Kiel6000; 1974 sediment samples only; 2001 plume and camera tow (did not confirm activity)
Eolo Seamount active, inferred arc volcano Aeolian Arc, Tyrrhenian Sea 38.5800 14.1667 800 1976 Fe crusts only; 2007 plume only; 2011 ROV Hercules but can not confirm based on Carey et al. (2012)
Enarete Seamount active, confirmed arc volcano Aeolian Arc, Tyrrhenian Sea 38.6250 14.0000 600 2011 ROV Hercules; 1976 Fe crusts only; 1997 manganese crust only; 2007 plume only
ELSC3 active, inferred back-arc spreading center Lau Basin -21.1667 -176.3333 2140 2009 plume only
El Hierro, Tagoro active, confirmed intra-plate volcano 27.6200 -17.9900 350 2016 submersible JAGO, 2017 ROV Liropus 2000, 2011 water column sampling
Edmond Field active, confirmed mid-ocean ridge CIR -23.8780 69.5960 3320 2001 ROV Jason
Edison Seamount active, inferred arc volcano Tabar-Feni Arc -3.3100 152.5800 1450 1994 and 1998 TV grab sampling did not confirm hydrothermal activity
east of Central Spreading Ridge inactive back-arc spreading center North Fiji Basin -15.4510 174.6902 3000 NotProvided
East Mata submarine volcano active, inferred arc volcano Tonga Arc -15.1010 -173.6780 1350 2008 plume only; 2009 plume only
East Diamante volcano active, confirmed arc volcano Mariana Arc 15.9300 145.6700 457 2004 ROV ROPOS; 2003 plume only
East Blanco Depression active, confirmed mid-ocean ridge JdF Ridge 44.2170 -129.6250 3460 1994 ROV U.S. Navy's Advanced Tethered Vehicle
E Los Huellos Caldera active, inferred mid-ocean ridge Galapagos Rift 0.9500 -90.5300 1600 2005 plume only; 2005 towed video Medea did not confirm activity
E Eye of Mordor inactive mid-ocean ridge Galapagos Rift 1.9058 -91.2310 1600 2005 towed video Medea found inactive chimneys
Dugong submarine volcano active, inferred back-arc spreading center Lau Basin -15.4500 -175.7000 1170 2008 plume only
Duanqiao active, inferred mid-ocean ridge SWIR -37.6579 50.4671 1780 2008 video and TV-grab DY115-20 Leg 5; 2015 TV-grab DY125-34
DSDP Hole 504B inactive mid-ocean ridge Galapagos Rift 1.2267 -83.7300 3500 NotProvided
Doyo Seamount active, confirmed arc volcano Izu-Bonin Arc 27.6833 140.8167 520 1990 submersible Shinkai 2000
Douglas Strait caldera, Thule Island, South Sandwich Islands active, inferred arc volcano South Sandwich Arc -59.4167 -27.3333 625 2009 plume only; 2008 or earlier high resolution bathymetry only
Dorado Outcrop active, confirmed other 9.0800 -87.0950 3000 2013 ROV Jason Dive J2-751
Don Joao de Castro Bank active, confirmed mid-ocean ridge Terceira Rift 38.2300 -26.6300 45 1995 SCUBA
Dodo Field active, confirmed mid-ocean ridge CIR -18.3470 65.3050 2730 2009 submersible Shinkai 6500; 2006 plume only
Discovery Deep active, inferred mid-ocean ridge Red Sea 21.2830 38.0500 2100 1965 "confirmed" hot brine and cored seafloor, but see Table 1 in Miller et al. (1966) for historical measurements
Deyin-1 active, confirmed mid-ocean ridge S MAR -15.1666 -13.3558 2850 2012 TV-grab; 2011 deposits only; 2013 plume only
DESMOS Cauldron active, confirmed back-arc spreading center Manus Basin -3.6958 151.8717 2000 1990 deep-sea monitoring system (DESMOS) video and still cameras
Dellwood Seamount inactive mid-ocean ridge Explorer Ridge 50.7470 -130.8961 800 1974 or earlier deposits only; 2018 ROV Hercules inactive
Deception Island active, confirmed back-arc spreading center Bransfield Strait -62.9500 -60.6500 100 1995 or earlier intertidal
Daisan-Kume Knoll active, confirmed arc volcano Ryukyu Arc 26.3020 126.4125 1370 2015 ROV Kaiko; 2014 ROV Hyper Dolphin 3000 Dive 1761 may have confirmed; 2014 AUV temperature anomaly
Daikoku volcano active, confirmed arc volcano Mariana Arc 21.3240 144.1940 450 2004 ROV ROPOS; 2003 plume only
Daiichi-Amami knoll active, inferred arc volcano Ryukyu Arc 28.4500 128.7500 350 2013 multibeam echo sounder on S/V Takuyo and AUV Gondo
Consag Basin active, inferred mid-ocean ridge Gulf of California 30.6333 -113.9083 140 2007 echosounder and grab samples
Conical Seamount inactive arc volcano Tabar-Feni Arc -3.2500 152.6600 1050 1998 TV grab survey determined inactive
CLSC, southern plumes on CL6 active, inferred back-arc spreading center Lau Basin -18.5000 -176.3833 2250 2009 plume only
CLSC, plumes on CL1 active, inferred back-arc spreading center Lau Basin -17.8667 -176.3833 2250 2009 plume only
CLSC, northern plumes on CL6 active, inferred back-arc spreading center Lau Basin -18.1333 -176.2833 2250 2009 plume only
CLSC, CL_8 active, inferred back-arc spreading center Lau Basin -18.0500 -176.3333 2250 2009 plume only
CLSC, CL_7 active, inferred back-arc spreading center Lau Basin -18.1333 -176.3667 2250 2009 plume only
CLSC, A3 active, confirmed back-arc spreading center Lau Basin -18.6000 -176.4500 2500 1990 submersible Mir
Clark volcano active, confirmed arc volcano Kermadec Arc -36.4490 177.8400 930 2005 submersible Pisces V; 1999 plume only
CIR, Segment 3, Hydrothermal Plume Site active, inferred mid-ocean ridge CIR -24.0000 69.6667 2840 1987 plume only; 2005/2006 plume only
CIR, 8-17 S, Segment 7 active, inferred mid-ocean ridge CIR -17.0000 66.8000 3100 2010 plume only
CIR, 8-17 S, Segment 6, 14.75 S active, inferred mid-ocean ridge CIR -14.7500 66.5000 3400 2010 plume only
CIR, 8-17 S, Segment 6, 14.3 S active, inferred mid-ocean ridge CIR -14.3000 66.1000 3500 2010 plume only
CIR, 8-17 S, Segment 5, 12.6 S active, inferred mid-ocean ridge CIR -12.6000 66.1000 3800 2010 plume only
CIR, 8-17 S, Segment 5, 12.25 S active, inferred mid-ocean ridge CIR -12.2500 65.7000 4000 2010 plume only
CIR, 8-17 S, Segment 4, 11.3 S active, inferred mid-ocean ridge CIR -11.3000 66.4000 3500 2010 plume only
CIR, 8-17 S, Segment 4, 11.2 S active, inferred mid-ocean ridge CIR -11.2000 66.5000 3800 2010 plume only
CIR, 8-17 S, Segment 4, 10.9 S active, inferred mid-ocean ridge CIR -10.9000 66.7000 3500 2010 plume only
CIR, 8-17 S, Segment 3 active, inferred mid-ocean ridge CIR -10.6600 66.5000 3500 2010 plume only
CIR, 8-17 S, Segment 2 active, inferred mid-ocean ridge CIR -9.9000 66.7500 4000 2010 plume only
CIR, 8-17 S, Segment 1 active, inferred mid-ocean ridge CIR -8.2500 68.2000 3600 2010 plume only
CIR, 19 29'S active, inferred mid-ocean ridge CIR -19.4830 65.7330 2700 1988 plume only; 2000 submersible Nautile did not confirm activity
Chile Triple Junction, 10 km north active, inferred mid-ocean ridge Chile Rise -46.2000 -75.8333 3000 2010 plume only
Chile Triple Junction active, inferred mid-ocean ridge Chile Rise -46.3000 -75.8000 3000 2010 plume only
Chile Rise, Segment N9A active, inferred mid-ocean ridge Chile Rise -39.0500 -91.5833 3450 1998 plume only
Chile Rise, Segment N8 active, inferred mid-ocean ridge Chile Rise -38.7167 -91.5667 3330 1998 plume only
Champagne Hot Springs active, confirmed arc volcano Lesser Antilles Arc 15.2500 -61.3830 5 2001 or earlier (assume SCUBA)
Chamorro volcano active, confirmed arc volcano Mariana Arc 20.8100 144.7050 896 2016 ROV Deep Discoverer; 2003 plume only
Central Spreading Ridge, Station 19 S active, inferred back-arc spreading center North Fiji Basin -19.0000 173.5000 3000 1991 submersible Shinkai 6500 did not confirm activity
central Manus Basin, Bismarck Sea inactive back-arc spreading center Manus Basin -3.4199 150.1681 2500 NotProvided
Central Cleft, off-axis active, confirmed mid-ocean ridge JdF Ridge 44.7583 -130.2750 2200 2000 ROV Tiburon
Central Andaman Trough, seamount crater, dredge 6 active, inferred back-arc spreading center Andaman Basin 10.0000 94.0000 1640 1994 deposits only
Central Andaman Trough, rift valley, dredges 9 and 10 active, inferred back-arc spreading center Andaman Basin 10.4166 94.1666 3350 1994 deposits only
Carlsberg Ridge, CR2003 active, inferred mid-ocean ridge Carlsberg Ridge 6.0500 60.9500 3500 2003 plume only; 2007 plume only
Carlsberg Ridge, 63 50'E active, inferred mid-ocean ridge Carlsberg Ridge 3.6916 63.8333 3500 2009 plume only; 2012 plume and deposits
Carlsberg Ridge, 63 40'E active, inferred mid-ocean ridge Carlsberg Ridge 3.7000 63.6666 3500 2007 plume only
Carlsberg Ridge, 1.67 S inactive mid-ocean ridge Carlsberg Ridge -1.6768 67.7700 4500 NotProvided
Capo Palinuro active, confirmed other Coastal Italy 40.0167 15.2667 30 1990 or earlier, likely by SCUBA
Capo Miseno, Gulf of Naples active, confirmed other Coastal Italy 40.7833 14.0833 20 1982 or earlier, likely by SCUBA
Calypso Vents active, confirmed back-arc spreading center Taupo Volcanic Zone -37.6800 177.1170 200 1989 submersible Soucoup
Calyfield active, confirmed mid-ocean ridge Galapagos Rift 0.8300 -89.6083 1660 2002 submersible Alvin
C-ELSC, unnamed active, inferred back-arc spreading center Lau Basin -21.1070 -176.2920 2300 2004 (assume submersible Shinkai 6500); 2004 plume only on previous cruise
C-ELSC, plume 19 active, inferred back-arc spreading center Lau Basin -20.8700 -176.2170 2230 2004 plume only
C-ELSC, plume 18 active, inferred back-arc spreading center Lau Basin -20.9500 -176.2390 2230 2004 plume only
C-ELSC, plume 17 active, inferred back-arc spreading center Lau Basin -20.9900 -176.2530 2270 2004 plume only
C-ELSC, plume 15 active, inferred back-arc spreading center Lau Basin -21.2700 -176.3470 2230 2004 plume only
C-ELSC, plume 14 active, inferred back-arc spreading center Lau Basin -21.3200 -176.3640 2100 2004 plume only
C-ELSC, plume 13 active, inferred back-arc spreading center Lau Basin -21.4150 -176.3720 2100 2004 plume only
Bubbylon active, confirmed mid-ocean ridge N MAR 37.8000 -31.5333 1000 2010 ROV MARUM-QUEST, same cruise as plume discovered by multibeam echosounder
Brown Bear Seamount inactive mid-ocean ridge JdF Ridge 46.0333 -130.5500 1500 NotProvided
Brothers volcano active, confirmed arc volcano Kermadec Arc -34.8667 179.0667 1800 1998 towed camera; 1996 dredging only
Broken Spur active, confirmed mid-ocean ridge N MAR 29.1700 -43.1717 3100 1993 submersible Alvin; earlier in 1993, water column anomalies and towed camera did not confirm activity
Bounty Seamount active, confirmed intra-plate volcano Central Pacific -25.1667 -129.4000 420 1999 submersible Nautile; 1989 plume only
Boomerang Seamount active, inferred mid-ocean ridge SEIR -37.7217 77.8250 850 1996 plume and wax core only
Beebe active, confirmed mid-ocean ridge Mid-Cayman Rise 18.5466 -81.7182 4957 2010 AUV Autosub6000 and HyBIS TVG; 2009 plume only
Bayonnaise Knoll caldera active, inferred back-arc spreading center Izu-Bonin back-arc 31.9667 139.7333 900 2003 temperature anomalies, but camera survey observed inactive vent deposits
Bataan active, inferred arc volcano Luzon/Bicol Arc 20.0000 122.0000 2002 or earlier some indications of activity
Banua Wuhu submarine volcano active, confirmed arc volcano Sangihe Arc 3.1380 125.4910 10 1996 or earlier, likely by SCUBA
Banda Api active, confirmed arc volcano Banda/Sunda Arc -4.5250 129.8710 3 1993 SCUBA
Bai Causeway active, inferred mid-ocean ridge SWIR -37.9000 48.8000 3000 2014 leg 2 or 3 of the 30th Chinese Cruise
Bahia Concepcion active, confirmed other Coastal Baja California 26.6667 -111.8333 15 1968 or earlier, likely by SCUBA
Baby Bare Seamount active, confirmed mid-ocean ridge JdF Ridge 47.7100 -127.7870 2600 1995 submersible Alvin
Axial Seamount, International District active, confirmed mid-ocean ridge JdF Ridge 45.9266 -129.9795 1544 1986 submersible Pisces IV
Axial Seamount, CASM active, confirmed mid-ocean ridge JdF Ridge 45.9892 -130.0272 1580 1983 submersible Pisces IV
Axial Seamount, ASHES active, confirmed mid-ocean ridge JdF Ridge 45.9333 -130.0140 1540 1984 submersible Alvin
Aurora active, confirmed mid-ocean ridge Gakkel Ridge 82.8833 -6.2500 4100 2001 shimmering water in camera tow and sulfide chimney in dredge
Atlantis II Deep active, inferred mid-ocean ridge Red Sea 21.3417 38.0750 2200 1965 "confirmed" hot brine and cored seafloor, but see Table 1 in Miller et al. (1966) for historical measurements
Ashadze-4 inactive mid-ocean ridge N MAR 12.9700 -44.8500 4530 2007 ROV VICTOR 6000 did not find hydrothermal activity
Ashadze-3 inactive mid-ocean ridge N MAR 12.9860 -44.8610 4200 2005 plume and dredge only
Ashadze-2 active, confirmed mid-ocean ridge N MAR 12.9917 -44.9067 3300 2007 ROV Victor 6000; 2005 TV profiling, plume, and dredge did not confirm activity
Ashadze-1 active, confirmed mid-ocean ridge N MAR 12.9733 -44.8633 4200 2003 TV profiling; 2007 ROV Victor 6000
Area JX active, inferred mid-ocean ridge CIR -22.9666 69.1833 3500 1986 plume only (camera tow did not confirm)
Area EX/FX active, inferred mid-ocean ridge CIR -21.4000 68.7666 3300 1986 plume and sediments
Animal Farm active, confirmed mid-ocean ridge S EPR -18.6080 -113.4000 2675 1993 submersible Nautile
AMAR active, inferred mid-ocean ridge N MAR 36.3833 -33.6500 2600 1992 plume only; 1994 plume only
Alice Springs Field active, confirmed back-arc spreading center Mariana Trough 18.2103 144.7073 3640 1987 submersible Alvin; 1982 plume only
Alarcon Rise/Tamayo intersection active, inferred mid-ocean ridge Gulf of California 23.2336 -108.6168 2358 2015 ROV Doc Ricketts did not confirm activity
Alarcon Rise/Pescadero intersection active, inferred mid-ocean ridge Gulf of California 23.6423 -108.3948 2384 2015 ROV Doc Ricketts did not confirm activity
Alarcon Rise, Tzab-ek active, confirmed mid-ocean ridge Gulf of California 23.3526 -108.5597 2249 2015 ROV Doc Ricketts
Alarcon Rise, Meyibo active, confirmed mid-ocean ridge Gulf of California 23.3553 -108.5443 2295 2012 ROV Doc Ricketts
Alarcon Rise, Ja Sit active, confirmed mid-ocean ridge Gulf of California 23.3765 -108.5315 2304 2012 ROV Doc Ricketts
Akuseki-jima active, confirmed arc volcano Ryukyu Arc 29.4610 129.5970 5 1993 or earlier, likely by SCUBA
Ahyi active, inferred arc volcano Mariana Arc 20.4200 145.0300 60 2003 plume only
AHA Field active, confirmed mid-ocean ridge N EPR 1.7333 -102.2830 2850 2000 towed imaging ARGO-II
Aegir active, confirmed mid-ocean ridge Mohns Ridge 72.3440 1.5550 2600 2015 ROV Ægir 6000; 2013 plume only; 2015 AUV
Adventure Caldera active, confirmed arc volcano South Sandwich Arc -59.7210 -27.8571 520 2011 SHRIMP towed camera system; 2010 high resolution bathymetry only
Aden New Century Mountains active, inferred mid-ocean ridge Aden Ridge 12.0833 45.6667 800 2000-2001 plume only
Aden active, confirmed mid-ocean ridge Aden Ridge 11.9500 43.6667 1600 1984 submersible Cyana
ABE active, confirmed back-arc spreading center Lau Basin -20.7619 -176.1910 2220 2004 AUV ABE; 2004 plume only on previous cruise
AAR KR2 active, inferred mid-ocean ridge SEIR -60.0000 152.5000 3200 2011 plume only
AAR KR1, Mujin active, inferred mid-ocean ridge SEIR -62.1000 158.8000 2100 2011 plume and biological samples
94SO2 active, inferred back-arc spreading center New Hebrides back-arc -19.4000 169.9000 980 1994 towed camera with temperature did not confirm activity
13 N Ridge Site active, confirmed back-arc spreading center Mariana Trough 13.0987 143.6886 3036 2000 deep-tow camera (later, same year - ROV Kaiko)

The InterRidge Vents Database is hosted by InterRidge at the Institut de Physique du Globe de Paris (IPGP), France.
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For more information, contact Stace Beaulieu, Woods Hole Oceanographic Institution, USA

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