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N. Pacific

Below is the subset of Vent Fields that contain the taxonomy term (Activity, Tectonic Setting, Region, Ocean, National Jurisdiction, Temperature Category, or MGDS Feature ID) listed above.
You can sort the list below by clicking on a column header.

Vent Field Name IDsort descending Activity Tectonic Setting Region Latitude Longitude Maximum or Single Reported Depth Year and How Discovered
13 N Ridge Site active, confirmed back-arc spreading center Mariana Trough 13.1000 143.6833 2900 2000 deep-tow camera
AHA Field active, confirmed mid-ocean ridge N EPR 1.7333 -102.2830 2850 2000 towed imaging ARGO-II
Ahyi active, inferred arc volcano Mariana Arc 20.4200 145.0300 60 2003 plume only
Akuseki-jima active, confirmed arc volcano Ryukyu Arc 29.4610 129.5970 5 1993 or earlier, likely by SCUBA
Alarcon Rise, Ja Sit active, confirmed mid-ocean ridge Gulf of California 23.3765 -108.5315 2304 2012 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, Tzab-ek active, confirmed mid-ocean ridge Gulf of California 23.3526 -108.5597 2249 2015 ROV Doc Ricketts
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/Tamayo intersection active, inferred mid-ocean ridge Gulf of California 23.2336 -108.6168 2358 2015 ROV Doc Ricketts did not confirm activity
Alice Springs Field active, confirmed back-arc spreading center Mariana Trough 18.2167 144.6833 3640 1987 submersible Alvin; 1982 plume only
Axial Seamount, ASHES active, confirmed mid-ocean ridge JdF Ridge 45.9333 -130.0140 1540 1984 submersible Alvin
Axial Seamount, CASM active, confirmed mid-ocean ridge JdF Ridge 45.9892 -130.0272 1580 1983 submersible Pisces IV
Axial Seamount, International District active, confirmed mid-ocean ridge JdF Ridge 45.9266 -129.9795 1544 1986 submersible Pisces IV
Baby Bare Seamount active, confirmed mid-ocean ridge JdF Ridge 47.7100 -127.7870 2600 1995 submersible Alvin
Bahia Concepcion active, confirmed other Coastal Baja California 26.6667 -111.8333 15 1968 or earlier, likely by SCUBA
Banua Wuhu submarine volcano active, confirmed arc volcano Sangihe Arc 3.1380 125.4910 10 1996 or earlier, likely by SCUBA
Bataan active, inferred arc volcano Luzon/Bicol Arc 20.0000 122.0000 2002 or earlier some indications of activity
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
Brown Bear Seamount inactive mid-ocean ridge JdF Ridge 46.0333 -130.5500 1500 NotProvided
Calyfield active, confirmed mid-ocean ridge Galapagos Rift 0.8300 -89.6083 1660 2002 submersible Alvin
Central Cleft, off-axis active, confirmed mid-ocean ridge JdF Ridge 44.7583 -130.2750 2200 2000 ROV Tiburon
Chamorro volcano active, inferred arc volcano Mariana Arc 20.8100 144.7050 875 2003 plume only
Consag Basin active, inferred mid-ocean ridge Gulf of California 30.6333 -113.9083 140 2007 echosounder and grab samples
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
Daikoku volcano active, confirmed arc volcano Mariana Arc 21.3240 144.1940 450 2004 ROV ROPOS; 2003 plume only
Dellwood Seamount inactive mid-ocean ridge Explorer Ridge 50.8579 -129.3515 800 NotProvided
Doyo Seamount active, confirmed arc volcano Izu-Bonin Arc 27.6833 140.8167 520 1990 submersible Shinkai 2000
DSDP Hole 504B inactive mid-ocean ridge Galapagos Rift 1.2267 -83.7300 3500 NotProvided
E Eye of Mordor inactive mid-ocean ridge Galapagos Rift 1.9058 -91.2310 1600 2005 towed video Medea found inactive chimneys
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
East Blanco Depression active, confirmed mid-ocean ridge JdF Ridge 44.2170 -129.6250 3460 1994 ROV U.S. Navy's Advanced Tethered Vehicle
East Diamante volcano active, confirmed arc volcano Mariana Arc 15.9300 145.6700 457 2004 ROV ROPOS; 2003 plume only
EPR 87D1 Seamount inactive mid-ocean ridge N EPR 11.5333 -103.8600 2090 NotProvided
EPR, 10 02'N active, confirmed mid-ocean ridge N EPR 10.0330 -104.3300 2560 1992 submersible Alvin
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 44.6'N active, confirmed mid-ocean ridge N EPR 10.7433 -103.6500 2580 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, 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 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 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 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 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, 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, 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, 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, 14 N seamount inactive mid-ocean ridge N EPR 14.1500 -104.3667 2600 NotProvided
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, 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, 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, 8 53'N active, inferred mid-ocean ridge N EPR 8.9000 -104.2000 2580 1991 plume only
EPR, 9 17'N active, confirmed mid-ocean ridge N EPR 9.2800 -104.2166 2585 1989 Argo I towed video
EPR, 9 30'N active, confirmed mid-ocean ridge N EPR 9.5167 -104.2414 2580 1989 Argo I towed video
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 40'N active, confirmed mid-ocean ridge N EPR 9.6500 -104.2600 2572 1989 Argo I towed video; 1991 submersible Alvin
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 50'N active, confirmed mid-ocean ridge N EPR 9.8300 -104.2900 2520 1989 Argo I towed video
EPR, Manzanillo Spreading Segment active, inferred mid-ocean ridge N EPR 18.2500 -106.3000 2600 1997 plume only
EPR, mid 17 N segment active, inferred mid-ocean ridge N EPR 17.0000 -105.3800 2750 1997 plume only
EPR, northern 17 N segment active, inferred mid-ocean ridge N EPR 17.6700 -105.0050 2800 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, southern 16 N segment active, inferred mid-ocean ridge N EPR 15.5000 -105.4000 2300 1997 plume only
EPR, southern 17 N segment active, inferred mid-ocean ridge N EPR 16.5800 -105.3000 2700 1997 plume only
EPR/Tamayo intersection active, inferred mid-ocean ridge N EPR 22.9333 -108.0667 3200 1979 submersible Alvin did not confirm activity
Esmeralda Bank active, confirmed arc volcano Mariana Arc 14.9667 145.2500 323 1990 towed video and TV-grab; 1978 hydrothermal deposits only
ET active, inferred mid-ocean ridge JdF Ridge 48.1993 -128.9257 2500 NotProvided
Explorer Deep inactive mid-ocean ridge Explorer Ridge 50.0833 -129.7500 3200 NotProvided
Eye of Mordor Seamount active, inferred mid-ocean ridge Galapagos Rift 1.9410 -91.3100 1555 2005 plume only
Feather Duster active, confirmed mid-ocean ridge N EPR 10.9267 -103.6767 2520 1984 towed camera and submersible Alvin
Floc active, confirmed mid-ocean ridge JdF Ridge 46.3133 -129.7050 2290 1993 DEEPTOW and submersible Alvin
Flow active, confirmed mid-ocean ridge JdF Ridge 46.5250 -129.5783 2390 1993 ROV ROPOS
Forecast active, confirmed arc volcano Mariana Arc 13.4000 143.9166 1470 1992 submersible Shinkai 6500
Fukujin volcano active, inferred arc volcano Mariana Arc 21.9300 143.4700 1100 1987 deposits only
Galapagos Mounds active, confirmed mid-ocean ridge Galapagos Rift 1.4500 -86.1665 2700 1977 submersible Alvin
Galapagos Rift, 85 50'W inactive mid-ocean ridge Galapagos Rift 0.7500 -85.8333 2600 1988 or earlier submersible observations
Galapagos Rift, 93.7 W active, inferred mid-ocean ridge Galapagos Rift 2.4970 -93.7700 2220 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, 94.7 W active, inferred mid-ocean ridge Galapagos Rift 2.6000 -94.7750 2690 2005 plume only
Galapagos Rift, 95 W inactive mid-ocean ridge Galapagos Rift 2.5000 -95.1667 2600 NotProvided
Galapagos Rift, 95.5 W active, inferred mid-ocean ridge Galapagos Rift 2.6700 -95.4500 3200 1990 submersible Alvin did not confirm activity
Gorda Ridge, 41 30'N inactive mid-ocean ridge Gorda Ridge 41.5167 -127.4500 3350 1984 deposits 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, EP96B active, inferred mid-ocean ridge Gorda Ridge 42.5500 -126.8333 3400 1984 deposits only; 1996 plume only
Gorda Ridge, GR-15 active, inferred mid-ocean ridge Gorda Ridge 42.9500 -126.5500 3365 1985 plume only
Green Seamount inactive mid-ocean ridge N EPR 20.8033 -109.2833 2000 1982 submersible Alvin observed only inactive
Guaymas Basin, Northern Trough inactive mid-ocean ridge Gulf of California 27.3050 -111.5067 2000 1977 submersible Seacliff (hydrothermal deposits only)
Guaymas Basin, Northern Trough off-axis active, inferred mid-ocean ridge Gulf of California 27.5600 -111.5500 1600 2009 towed camera/CTD/bottles
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
Hawaiian Ridge inactive intra-plate volcano Central Pacific 15.0000 -157.5000 5000 1987 or earlier
Hess Deep inactive mid-ocean ridge Galapagos Rift 2.2500 -101.5000 5100 NotProvided
High-Rise Field active, confirmed mid-ocean ridge JdF Ridge 47.9667 -129.0900 2200 1988 submersible Alvin
Hot Beach, Mendeleev Volcano active, confirmed arc volcano Kuril Arc 43.9760 145.7360 1 1990 or earlier, from the beach
Iguanas-Pinguinos active, confirmed mid-ocean ridge Galapagos Rift 2.1000 -91.9350 1640 2005 towed video Medea
Iheya Ridge active, confirmed back-arc spreading center Okinawa Trough 27.5417 126.9750 1430 1988 submersible Shinkai 2000; 1987 plume only
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
Izena Cauldron active, confirmed back-arc spreading center Okinawa Trough 27.2667 127.0833 1610 1988 submersible Shinkai 2000
Jaco Scar active, confirmed arc volcano Costa Rica fore arc 9.1175 -84.8397 1790 2009 submersible Alvin
Kagamil Island active, confirmed arc volcano Aleutian Arc, western 52.9800 -169.7200 5 2007 SCUBA
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)
Kaikata Seamount active, confirmed arc volcano Izu-Bonin Arc 26.7000 141.0833 930 1988 submersible Shinkai 2000; 1985 dredge only
Kasuga 1 Seamount inactive arc volcano Mariana Arc 21.7650 143.7100 600 2003 no plume detected
Kasuga 2 Seamount active, confirmed arc volcano Mariana Arc 21.6000 143.6167 500 1987 submersible Alvin
Kasuga 3 Seamount active, confirmed arc volcano Mariana Arc 21.3833 143.6000 1140 1987 submersible Alvin
Kawio Barat active, confirmed arc volcano Sangihe Arc 4.8133 125.0816 1890 2003 towed video, CTD/transmissometer, and dredge
Kodakara-jima active, confirmed arc volcano Ryukyu Arc 29.2166 129.3333 10 1993 or earlier, likely by SCUBA
Kraternaya Bight, Ushishir Volcano active, confirmed arc volcano Kuril Arc 47.5167 152.8000 60 1985 SCUBA
Kueishan Island active, confirmed back-arc spreading center Okinawa Trough 24.8333 121.9500 30 1999, likely by SCUBA
Kueishan Island, offshore active, confirmed back-arc spreading center Okinawa Trough 24.8333 122.0000 1200 2008 or earlier
Kurose Hole inactive arc volcano Izu-Bonin Arc 33.4000 139.6800 760 1989 inactive; 2009 inactive
Lembeh Strait active, confirmed arc volcano Sangihe Arc 1.8000 125.2000 3 NotProvided
Leyte active, inferred arc volcano Luzon/Bicol Arc 11.5000 124.7000 2002 or earlier some indications of activity
Loihi Seamount active, confirmed intra-plate volcano Central Pacific 18.9500 -155.2500 4800 1985 bottom photography R/V Hakuho Maru; 1987 submersible Alvin
Magic Mountain active, confirmed mid-ocean ridge Explorer Ridge 49.7500 -130.2667 1850 1984 submersible Pisces IV
Magic Mountain, 3-km south active, inferred mid-ocean ridge Explorer Ridge 49.7250 -130.2667 1850 2002 AUV ABE plume only
Main Endeavour Field active, confirmed mid-ocean ridge JdF Ridge 47.9500 -129.1000 2220 1984 submersible Alvin; 1982 dredge only
Makhahnas active, inferred arc volcano Mariana Arc 20.5300 144.8833 420 2003 no plume detected
Mariana Mounds active, confirmed back-arc spreading center Mariana Trough 18.0333 144.2833 3600 1987 submersible Alvin
Mariana Trough, plume 2 active, inferred back-arc spreading center Mariana Trough 12.7600 143.4800 2880 2003 plume only
Mariana Trough, unnamed active, confirmed back-arc spreading center Mariana Trough 18.0467 144.7533 3676 1987 submersible Alvin
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
Medusa active, confirmed mid-ocean ridge N EPR 9.1404 -104.2065 2580 2007 ROV Jason II; 1991 plume only
Middle Valley, Bent Hill Massive Sulfide inactive mid-ocean ridge JdF Ridge 48.4500 -128.6783 2400 1985 deposits only
Middle Valley, Dead Dog Vent Field active, confirmed mid-ocean ridge JdF Ridge 48.4567 -128.7083 2450 1992 or earlier towed video
Middle Valley, ODP Mound active, confirmed mid-ocean ridge JdF Ridge 48.4300 -128.6816 2440 1992 or earlier towed video
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
Minami-Hiyoshi submarine volcano active, confirmed arc volcano Mariana Arc 23.4970 141.9400 80 2005 ROV HyperDolphin
Mokuyo Seamount active, confirmed arc volcano Izu-Bonin Arc 28.3200 140.5800 1200 1990 submersible Shinkai 2000
Mothra Field active, confirmed mid-ocean ridge JdF Ridge 47.9230 -129.1090 2270 1996 ROV ROPOS; 1986 plume only
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
Myojin Knoll active, confirmed arc volcano Izu-Bonin Arc 32.1033 139.8683 1360 1996 submersible Shinkai 2000
Myojinsho Caldera active, inferred arc volcano Izu-Bonin Arc 31.8833 139.9500 1110 1988 deposits only; 2005 plume only
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
Natsushima 84-1 Knoll active, confirmed back-arc spreading center Okinawa Trough 27.5750 127.1417 1600 1986 submersible Shinkai 2000
Naung active, inferred arc volcano Sangihe Arc 3.7791 125.3750 600 2001 dredge only, 2003 CTD only
Navidad active, confirmed mid-ocean ridge Galapagos Rift 2.5300 -94.0750 2380 2005 towed video Medea
NE Anatahan submarine volcano active, inferred arc volcano Mariana Arc 16.3750 145.7250 460 2003 multibeam and sidescan sonar only
NESCA active, confirmed mid-ocean ridge Gorda Ridge 41.0000 -127.4917 3300 1988 submersible Alvin; 1986 dredge and photographs did not confirm activity
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
Nishi-Shichito Ridge inactive arc volcano Izu-Bonin Arc 31.3667 138.7500 1600 NotProvided
Nishinoshima Island active, inferred arc volcano Izu-Bonin Arc 27.2367 140.8783 5 1975 SCUBA
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
North Cleft, low temperature active, confirmed mid-ocean ridge JdF Ridge 44.8833 -130.2667 2250 1987-1989 camera/CTD tows
North Knoll, Iheya Ridge active, confirmed back-arc spreading center Okinawa Trough 27.7908 126.8966 1100 1995 deep tow survey
Northwest Eifuku active, confirmed arc volcano Mariana Arc 21.4850 144.0430 1604 2004 ROV ROPOS; 2003 plume only
Northwest Rota-1 volcano active, confirmed arc volcano Mariana Arc 14.6010 144.7750 599 2004 ROV ROPOS; 2003 plume 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
Okinawa Trough, Site ES1 active, inferred back-arc spreading center Okinawa Trough 30.3303 129.0827 521 1992 dredge only
Okinawa Trough, Site ES2 active, inferred back-arc spreading center Okinawa Trough 28.8137 128.1028 779 1992 dredge only
Omuro Hole active, confirmed arc volcano Izu-Bonin Arc 34.5467 139.4417 200 2012 ROV Hyper-Dolphin
Paramushir Island inactive arc volcano Kuril Arc 50.3300 155.5000 800 NotProvided
Parece Vela Ridge, Philippine Sea inactive back-arc spreading center Parece Vela Basin 16.0000 139.1667 5000 NotApplicable
Pegasus active, confirmed mid-ocean ridge Galapagos Rift 0.7500 -88.2000 2000 2011 ROV Little Hercules
Pescadero Basin, Auka active, confirmed mid-ocean ridge Gulf of California 23.9567 -108.8618 3673 2015 ROV Doc Ricketts
Philippine Ridge, West Philippine Basin inactive back-arc spreading center West Philippine Basin 12.0000 131.4170 5800 NotApplicable
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
Pika active, confirmed back-arc spreading center Mariana Trough 12.9183 143.6483 2990 2003 submersible Shinkai 6500; 2003 plume only
Precious Stone Mountain active, confirmed mid-ocean ridge Galapagos Rift 1.2200 -101.4900 1700 2009 deep-tow video and TV grab
Pulau Weh active, confirmed arc volcano Banda/Sunda Arc 5.8166 95.3000 8 1982 or earlier, likely by SCUBA
Punta Banda active, confirmed other Coastal Baja California 31.7500 -116.7500 30 1960's commercial abalone divers
Punta Mita, Bahia de Banderas active, confirmed other Coastal Mexico 20.7700 -105.5200 10 1997 photo/video most likely by SCUBA
Red Seamount active, confirmed mid-ocean ridge N EPR 20.8033 -109.3783 2000 1982 submersible Alvin
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)
Ruby active, confirmed arc volcano Mariana Arc 15.6200 145.5700 214 2006 ROV Jason II; 2003 plume only
Salty Dawg Field active, confirmed mid-ocean ridge JdF Ridge 47.9820 -129.0760 2200 1995 submersible Alvin, followed by ROV ROPOS
San Felipe active, inferred other Coastal Baja California 31.0000 -114.8000 1 1982 or earlier, likely from shore
Sasquatch Field active, confirmed mid-ocean ridge JdF Ridge 47.9970 -129.0660 2200 2000 submersible Alvin
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
Seamount X active, confirmed arc volcano Mariana Arc 13.2500 144.0200 1450 1994 or earlier submersible Shinkai 6500
SESCA active, inferred mid-ocean ridge Gorda Ridge 40.7500 -127.5200 3300 1986 sediments and heat-flow measurements
Shinkurose Bank inactive arc volcano Izu-Bonin Arc 33.5667 140.1667 200 1992 or earlier submersible Shinkai 2000
Snail active, confirmed back-arc spreading center Mariana Trough 12.9533 143.6200 2880 2003 ROV Jason II; 2003 plume only
Source active, confirmed mid-ocean ridge JdF Ridge 46.1550 -129.8100 2055 1993 submersible Alvin
South Cleft active, confirmed mid-ocean ridge JdF Ridge 44.6667 -130.3667 2250 1981 deep-tow photographs; 1984 submersible Alvin
South Sarigan Seamount active, inferred arc volcano Mariana Arc 16.5800 145.7800 240 2013 ROV HyperDolphin (did not confirm activity)
Split Seamount active, inferred mid-ocean ridge JdF Ridge 47.6400 -128.9667 2350 1990 camera tow (need reference to check if activity confirmed)
SPOT, Hatoma Knoll active, confirmed back-arc spreading center Okinawa Trough 24.8550 123.8410 1520 1999 submersible Shinkai 2000
SPOT, Yonaguni Knoll IV active, confirmed back-arc spreading center Okinawa Trough 24.8490 122.7000 1385 2000 submersibles Shinkai 2000 and Shinkai 6500
Stockwork active, inferred mid-ocean ridge JdF Ridge 47.9000 -129.1240 2300 2005 submersible Alvin (need publication to determine if confirmed)
Suiyo Seamount active, confirmed arc volcano Izu-Bonin Arc 28.5750 140.6417 1380 1991 submersible Shinkai 2000
Sumisu Caldera active, confirmed arc volcano Izu-Bonin Arc 31.4667 140.0667 690 1998 submersible Shinkai 2000
Sumisu Rift active, inferred back-arc spreading center Izu-Bonin back-arc 31.1000 139.8917 1600 1987 submersible Alvin inactive chimneys only
SW Syoyo active, inferred arc volcano Mariana Arc 22.3870 142.7620 1750 2003 plume only
Taketomi Thermal Area active, confirmed arc volcano Ryukyu Arc 24.3483 124.1017 23 1987 or earlier, likely by SCUBA
Tarama Knoll active, confirmed back-arc spreading center Okinawa Trough 25.0916 124.5416 1540 2009 ROV HyperDolphin
Tempus Fugit active, confirmed mid-ocean ridge Galapagos Rift 0.7683 -85.9100 2560 2011 ROV Little Hercules
Teotihuacan active, confirmed mid-ocean ridge N EPR 15.7333 -105.4333 2300 2010 submersible Nautile; 1997 plume only
Tevnia active, inferred mid-ocean ridge N EPR 10.3333 -103.5533 2925 1994 submersible Alvin did not confirm activity
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
Uka Pacha active, confirmed mid-ocean ridge Galapagos Rift 0.7700 -88.3000 2100 2011 ROV Little Hercules
W Eye of Mordor inactive mid-ocean ridge Galapagos Rift 1.9707 -91.3900 1600 2005 towed video Medea observed inactive chimneys
W Los Huellos Caldera active, inferred mid-ocean ridge Galapagos Rift 1.0000 -90.6000 1600 2005 plume only
W Syoyo active, inferred arc volcano Mariana Arc 22.5080 142.5330 2150 2003 plume only
Wagner Basin active, inferred mid-ocean ridge Gulf of California 31.0666 -114.0833 120 2007 echosounder and grab samples
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 Valley active, inferred mid-ocean ridge JdF Ridge 48.4833 -129.0417 3000 1987 and 1988 deposits only (towed camera did not confirm activity)
White Point, Palos Verde, California active, confirmed other Coastal California 33.7000 -118.3167 10 1984 or earlier, likely by SCUBA
Yoron Hole active, confirmed back-arc spreading center Okinawa Trough 27.4916 127.5333 590 2010 ROV Hyperdolphin
Zealandia active, inferred arc volcano Mariana Arc 16.8800 145.8500 144 2003 plume only; 2009 or earlier ROV did not confirm activity
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