mid-ocean ridge

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.
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Vent Field Name ID	Activity	Tectonic Setting	Region	Latitude	Longitude	Maximum or Single Reported Depth	Year and How Discovered
MAR, 23 35'N	inactive	mid-ocean ridge	N MAR	23.5833	-45.0000	3500	1980 submersible Alvin did not observe hydrothermal activity
Hess Deep	inactive	mid-ocean ridge	Galapagos Rift	2.2500	-101.5000	5100	NotProvided
Mount Jourdanne	inactive	mid-ocean ridge	SWIR	-27.8500	63.9333	2940	1998 submersible Shinkai 6500
Gorda Ridge, 41 30'N	inactive	mid-ocean ridge	Gorda Ridge	41.5167	-127.4500	3350	1984 deposits only
Galapagos Rift, 85 50'W	inactive	mid-ocean ridge	Galapagos Rift	0.7500	-85.8333	2600	1988 or earlier submersible observations
MAR, 12 48'N	inactive	mid-ocean ridge	N MAR	12.8000	-44.7883	2400	NotProvided
MAR, 24 20'N	inactive	mid-ocean ridge	N MAR	24.3500	-46.2000	3200	NotProvided
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
Dellwood Seamount	inactive	mid-ocean ridge	Explorer Ridge	50.7470	-130.8961	800	1974 or earlier deposits only; 2018 ROV Hercules inactive
MAR, 24 30'N	inactive	mid-ocean ridge	N MAR	24.5000	-46.1533	3900	1987 deposits only
Ashadze-4	inactive	mid-ocean ridge	N MAR	12.9700	-44.8500	4530	2007 ROV VICTOR 6000 did not find hydrothermal activity
Explorer Deep	inactive	mid-ocean ridge	Explorer Ridge	50.1000	-129.7500	3200	1969, deposits only
Romanche Fracture Zone	inactive	mid-ocean ridge	S MAR	-0.9767	-24.5133	3100	NotProvided
MAR, 15 50'N	inactive	mid-ocean ridge	N MAR	15.8667	-46.6667	3000	NotProvided
Galapagos Rift, 95 W	inactive	mid-ocean ridge	Galapagos Rift	2.5000	-95.1667	2600	NotProvided
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]
Jade Emperor Mountain	inactive	mid-ocean ridge	SWIR	-37.9400	49.2600	1500	2010 video sled, plume survey, and geological sampling all suggest inactive
Squid Forest	inactive	mid-ocean ridge	Kolbeinsey Ridge	68.0000	-17.5000	900	1999 ROV Aglantha
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
MAR, 16 46'N	inactive	mid-ocean ridge	N MAR	16.7950	-46.3800	3300	NotProvided
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)
MAR, 25 50'N	inactive	mid-ocean ridge	N MAR	25.8083	-44.9833	3000	NotProvided
DSDP Hole 504B	inactive	mid-ocean ridge	Galapagos Rift	1.2267	-83.7300	3500	NotProvided
Guaymas Basin, Northern Trough	inactive	mid-ocean ridge	Gulf of California	27.3050	-111.5067	2000	1977 submersible Seacliff (hydrothermal deposits only)
Owen transform fault	inactive	mid-ocean ridge	Carlsberg Ridge	9.8333	57.9500	4500	NotProvided
Brown Bear Seamount	inactive	mid-ocean ridge	JdF Ridge	46.0333	-130.5500	1500	NotProvided
EPR, 14 N seamount	inactive	mid-ocean ridge	N EPR	14.1500	-104.3667	2600	NotProvided
Carlsberg Ridge, 1.67 S	inactive	mid-ocean ridge	Carlsberg Ridge	-1.6768	67.7700	4500	NotProvided
EPR 87D1 Seamount	inactive	mid-ocean ridge	N EPR	11.5333	-103.8600	2090	NotProvided
E Eye of Mordor	inactive	mid-ocean ridge	Galapagos Rift	1.9058	-91.2310	1600	2005 towed video Medea found inactive chimneys
Ashadze-3	inactive	mid-ocean ridge	N MAR	12.9860	-44.8610	4200	2005 plume and dredge only
Petersburgskoe	inactive	mid-ocean ridge	N MAR	19.8666	-45.8666	3100	2010 dredging only
MESO Zone	inactive	mid-ocean ridge	CIR	-23.3927	69.2422	2850	1993 TV grab and water column measurements
Green Seamount	inactive	mid-ocean ridge	N EPR	20.8033	-109.2833	2000	1982 submersible Alvin observed only inactive
Logatchev-5	inactive	mid-ocean ridge	N MAR	14.7500	-44.9700	3100	2007 ROV VICTOR 6000 did not find hydrothermal activity
W Eye of Mordor	inactive	mid-ocean ridge	Galapagos Rift	1.9707	-91.3900	1600	2005 towed video Medea observed inactive chimneys
MAR, 22 30'N	inactive	mid-ocean ridge	N MAR	22.5000	-45.0050	2800	NotProvided
SEIR	inactive	mid-ocean ridge	SEIR	-28.0614	74.1733	5000	NotProvided
Chile Triple Junction, 10 km north	active, inferred	mid-ocean ridge	Chile Rise	-46.2000	-75.8333	3000	2010 plume only
GEISEIR site 30, segment O1	active, inferred	mid-ocean ridge	SEIR	-46.6240	96.0594	2500	2009 plume only
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
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
MAR, 11 N	active, inferred	mid-ocean ridge	N MAR	11.0380	-43.6483	4010	1984 plume only; 2009 plume only
EPR, 21 20'S	active, inferred	mid-ocean ridge	S EPR	-21.3670	-114.2570	2900	1981 plume only; 1987-1988 deposits only
SEIR-WXC15	active, inferred	mid-ocean ridge	SEIR	-50.2500	135.3000	3000	2015 plume only
Area EX/FX	active, inferred	mid-ocean ridge	CIR	-21.4000	68.7666	3300	1986 plume and sediments
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)
Reykjanes Ridge, Area A	active, inferred	mid-ocean ridge	Reykjanes Ridge	62.4500	-25.4330	500	NotProvided
Bai Causeway	active, inferred	mid-ocean ridge	SWIR	-37.9000	48.8000	3000	2014 leg 2 or 3 of the 30th Chinese Cruise
EPR, 17 56'S	active, inferred	mid-ocean ridge	S EPR	-17.9400	-113.3170	2620	1993 plume only
EPR, 31.4 S, Segment E4	active, inferred	mid-ocean ridge	S EPR	-31.4330	-111.9670	2350	1998 plume only
SWIR, D62	active, inferred	mid-ocean ridge	SWIR	-52.2530	15.1030	3990	2000-2001 plume and dredge only
Walsh	active, inferred	mid-ocean ridge	Mid-Cayman Rise	17.8333	-81.8333	4000	2009 plume only; 2013 plume only
GEISEIR site 11, segment K4	active, inferred	mid-ocean ridge	SEIR	-42.5375	82.8266	2600	2010 plume only
EPR, Manzanillo Spreading Segment	active, inferred	mid-ocean ridge	N EPR	18.2500	-106.3000	2600	1997 plume 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
S AMAR 2	active, inferred	mid-ocean ridge	N MAR	35.9670	-34.1830	2240	1992 plume only; 1994 plume only
Gakkel Ridge, Site 8	active, inferred	mid-ocean ridge	Gakkel Ridge	86.5333	69.0000	3500	2001 plume only
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)
CIR, 8-17 S, Segment 4, 10.9 S	active, inferred	mid-ocean ridge	CIR	-10.9000	66.7000	3500	2010 plume only
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
Chile Triple Junction	active, inferred	mid-ocean ridge	Chile Rise	-46.3000	-75.8000	3000	2010 plume only
GEISEIR site 31, segment O1	active, inferred	mid-ocean ridge	SEIR	-46.8956	96.5709	2600	2009 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
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)
Galapagos Rift, 94.4 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.5300	-94.3300	2400	2005 plume only
SEIR-WXC12	active, inferred	mid-ocean ridge	SEIR	-50.2500	136.2500	2780	2015 plume 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)
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
Gorda Ridge, EP96B	active, inferred	mid-ocean ridge	Gorda Ridge	42.5500	-126.8333	3400	1984 deposits only; 1996 plume only
Reykjanes Ridge, Area B	active, inferred	mid-ocean ridge	Reykjanes Ridge	59.8167	-29.6833	1000	1992 submersible Mir did not find vents
EPR, 27.7 S, Segment W3	active, inferred	mid-ocean ridge	S EPR	-27.7000	-112.9170	2105	1998 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
EPR, 7 S	active, inferred	mid-ocean ridge	S EPR	-7.0000	-107.5500	2600	1985/86 or 1989 TV grab
Mohns Ridge, 72.8 N	active, inferred	mid-ocean ridge	Mohns Ridge	72.8060	4.1650	2300	2013 plume only
SWIR, D82	active, inferred	mid-ocean ridge	SWIR	-52.2080	15.5830	4100	2000-2001 plume only
Wagner Basin	active, inferred	mid-ocean ridge	Gulf of California	31.0666	-114.0833	120	2007 echosounder and grab samples
GEISEIR site 12, segment K4	active, inferred	mid-ocean ridge	SEIR	-42.6600	83.0366	2600	2010 plume only
EPR, mid 17 N segment	active, inferred	mid-ocean ridge	N EPR	17.0000	-105.3800	2750	1997 plume only
GEISEIR site 20, segment L3	active, inferred	mid-ocean ridge	SEIR	-41.9508	87.8008	2400	2010 plume only
S Oceanographer	active, inferred	mid-ocean ridge	N MAR	34.8670	-36.4330	3460	1992 plume only
Gakkel Ridge, 7.5 E	active, inferred	mid-ocean ridge	Gakkel Ridge	85.0167	7.4500	3600	2001 plume only
Markov Deep	active, inferred	mid-ocean ridge	N MAR	5.9100	-33.1800	3500	2001-2002 and 2003 dredge only
GEISEIR site 32, segment O2	active, inferred	mid-ocean ridge	SEIR	-47.1196	96.8947	2600	2009 plume only
Stockwork	active, inferred	mid-ocean ridge	JdF Ridge	47.9000	-129.1240	2300	2005 submersible Alvin (need publication to determine if confirmed)
Red Sea Rift, 18 N	active, inferred	mid-ocean ridge	Red Sea	17.9667	40.0667	1500	1980 submersible Pisces XI (deposits only)
MAR, 33 S	active, inferred	mid-ocean ridge	S MAR	-32.9676	-14.4517	2600	2013 plume only
EPR, 27.9 S, Segment W3	active, inferred	mid-ocean ridge	S EPR	-27.8670	-112.9120	2180	1998 plume only
Galapagos Rift, 94.7 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.6000	-94.7750	2690	2005 plume only
SEIR-WXC02	active, inferred	mid-ocean ridge	SEIR	-50.2500	137.0000	2620	2015 plume only
SWIR, Plume 3, Segment 16	active, inferred	mid-ocean ridge	SWIR	-30.8500	59.3830	3900	1997 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
Vityaz megamullion	active, inferred	mid-ocean ridge	CIR	-5.4000	68.5833	3500	1979 plume and deposits only
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
South Kurchatov	active, inferred	mid-ocean ridge	N MAR	40.4670	-29.5500	2900	1992 plume only; 1995 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
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
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
Consag Basin	active, inferred	mid-ocean ridge	Gulf of California	30.6333	-113.9083	140	2007 echosounder and grab samples
GEISEIR site 13, segment L1	active, inferred	mid-ocean ridge	SEIR	-41.0125	86.0608	2800	2010 plume only
EPR, northern 17 N segment	active, inferred	mid-ocean ridge	N EPR	17.6700	-105.0050	2800	1997 plume only
GEISEIR site 21, segment L3	active, inferred	mid-ocean ridge	SEIR	-42.0050	87.8808	2400	2010 plume only
EPR, 8 53'N	active, inferred	mid-ocean ridge	N EPR	8.9000	-104.2000	2580	1991 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
Gakkel Ridge, Site 2	active, inferred	mid-ocean ridge	Gakkel Ridge	83.8500	-2.0000	3900	2001 plume only
Kolbeinsey Ridge, 69 N	active, inferred	mid-ocean ridge	Kolbeinsey Ridge	68.7581	-16.0000	1200	1980 or earlier sediments only
MAR, 30 S	active, inferred	mid-ocean ridge	S MAR	-29.9505	-13.8545	3379	2013 plume only
EPR, 17 S	active, inferred	mid-ocean ridge	S EPR	-17.0000	-113.1170	2680	1993 plume only
EPR, 21 40'S	active, inferred	mid-ocean ridge	S EPR	-21.6340	-114.3010	2730	1987-1988 deposits only
GEISEIR site 33, segment O2	active, inferred	mid-ocean ridge	SEIR	-47.2383	97.1566	2700	2009 plume only
AAR KR1, Mujin	active, inferred	mid-ocean ridge	SEIR	-62.1000	158.8000	2100	2011 plume and biological samples
Suakin Deep	active, inferred	mid-ocean ridge	Red Sea	19.6333	38.7333	2850	1972 deposits only
EPR, 28 S, Segment W3	active, inferred	mid-ocean ridge	S EPR	-28.0170	-112.9040	2130	1998 plume only
SEIR-WXC07	active, inferred	mid-ocean ridge	SEIR	-50.2500	138.3000	2420	2015 plume only
SWIR, Plume 5	active, inferred	mid-ocean ridge	SWIR	-27.9170	64.4500	4000	1997 plume only
Boomerang Seamount	active, inferred	mid-ocean ridge	SEIR	-37.7217	77.8250	850	1996 plume and wax core 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
ET	active, inferred	mid-ocean ridge	JdF Ridge	48.1993	-128.9257	2500	NotProvided
CIR, 8-17 S, Segment 5, 12.6 S	active, inferred	mid-ocean ridge	CIR	-12.6000	66.1000	3800	2010 plume only
EPR, 14 18'S	active, inferred	mid-ocean ridge	S EPR	-14.3000	-112.6670	2630	1993 plume only
W Los Huellos Caldera	active, inferred	mid-ocean ridge	Galapagos Rift	1.0000	-90.6000	1600	2005 plume only
GEISEIR site 14, segment L1	active, inferred	mid-ocean ridge	SEIR	-41.0716	86.1550	2700	2010 plume only
EPR, southern 17 N segment	active, inferred	mid-ocean ridge	N EPR	16.5800	-105.3000	2700	1997 plume only
GEISEIR site 23, segment M2	active, inferred	mid-ocean ridge	SEIR	-42.0272	89.2205	2400	2009 plume only
S-OH2	active, inferred	mid-ocean ridge	N MAR	34.0670	-37.4830	3250	2000 or earlier plume only
Gakkel Ridge, Site 3	active, inferred	mid-ocean ridge	Gakkel Ridge	84.4333	2.1333	4300	2001 plume only
MAR, 28 S	active, inferred	mid-ocean ridge	S MAR	-27.7936	-13.3730	3217	2013 plume only
EPR, 28.4 S, Segment W4	active, inferred	mid-ocean ridge	S EPR	-28.4170	-112.9640	2350	1998 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
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]
CIR, 8-17 S, Segment 6, 14.75 S	active, inferred	mid-ocean ridge	CIR	-14.7500	66.5000	3400	2010 plume only
GEISEIR site 34, segment O3	active, inferred	mid-ocean ridge	SEIR	-47.4145	97.4373	2700	2009 plume only
Landing Stage	active, inferred	mid-ocean ridge	SWIR	-37.5000	51.0000	2300	2014 leg 2 or 3 of the 30th Chinese Cruise
AAR KR2	active, inferred	mid-ocean ridge	SEIR	-60.0000	152.5000	3200	2011 plume only
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
Split Seamount	active, inferred	mid-ocean ridge	JdF Ridge	47.6400	-128.9667	2350	1990 camera tow (need reference to check if activity confirmed)
AMAR	active, inferred	mid-ocean ridge	N MAR	36.3833	-33.6500	2600	1992 plume only; 1994 plume only
Pacific-Antarctic Ridge, 60 S segment	active, inferred	mid-ocean ridge	Pacific-Antarctic Ridge	-60.0000	-152.0000	2300	2009 plume only
EPR, 28.3 S, Segment W3	active, inferred	mid-ocean ridge	S EPR	-28.3000	-112.9830	2220	1998 plume only
SEIR-WXC06	active, inferred	mid-ocean ridge	SEIR	-50.2500	138.5500	2400	2015 plume only
GEISEIR site 1, segment J2	active, inferred	mid-ocean ridge	SEIR	-39.4400	78.0920	2270	1996 plume only
SWIR, Plume 6	active, inferred	mid-ocean ridge	SWIR	-27.7670	65.1330	3200	1997 plume only
MAR, 7 57'S	active, inferred	mid-ocean ridge	S MAR	-7.9500	-13.4420	2600	2001 plume only
Gakkel Ridge, Site 5	active, inferred	mid-ocean ridge	Gakkel Ridge	86.3500	37.0000	3600	2001 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
EPR, 14 35'S	active, inferred	mid-ocean ridge	S EPR	-14.5830	-112.6670	2630	1993 plume only
SWIR, D20	active, inferred	mid-ocean ridge	SWIR	-53.0200	22.1880	4170	2000-2001 plume and dredge only
near Jade Emperor Mountain, on-axis	active, inferred	mid-ocean ridge	SWIR	-37.8666	49.2166	3000	2010 plume only
GEISEIR site 24, segment M3	active, inferred	mid-ocean ridge	SEIR	-43.0369	91.0357	2400	2009 plume only
MAR, 27 S	active, inferred	mid-ocean ridge	S MAR	-27.1476	-13.4753	3341	2013 plume only
EPR, 17 42'S	active, inferred	mid-ocean ridge	S EPR	-17.7000	-113.2500	2600	1993 plume only
EPR, 28.7 S, Segment W4	active, inferred	mid-ocean ridge	S EPR	-28.7000	-112.9880	2350	1998 plume only
GEISEIR site 35, segment O3	active, inferred	mid-ocean ridge	SEIR	-47.6179	97.8678	2600	2009 plume only
Area JX	active, inferred	mid-ocean ridge	CIR	-22.9666	69.1833	3500	1986 plume only (camera tow did not confirm)
MAR, 4 02'S	active, inferred	mid-ocean ridge	S MAR	-4.0333	-12.2500	4000	2005 plume only
Aden New Century Mountains	active, inferred	mid-ocean ridge	Aden Ridge	12.0833	45.6667	800	2000-2001 plume only
North FAMOUS	active, inferred	mid-ocean ridge	N MAR	36.9670	-32.9670	2500	1994 plume only
Pacific-Antarctic Ridge, 64 S segment	active, inferred	mid-ocean ridge	Pacific-Antarctic Ridge	-64.5000	-170.0000	2300	2009 plume only
Puy des Folles	active, inferred	mid-ocean ridge	N MAR	20.5083	-45.6417	2000	1996 submersible Nautile observed only inactive vents
Galapagos Rift, 93.7 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.4970	-93.7700	2220	2005 plume only
SWIR, 51.7 E	active, inferred	mid-ocean ridge	SWIR	-37.4660	51.7320	1595	2008 plume and dredge only
GEISEIR site 3, segment J4	active, inferred	mid-ocean ridge	SEIR	-41.7720	79.7530	2800	1996 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
SESCA	active, inferred	mid-ocean ridge	Gorda Ridge	40.7500	-127.5200	3300	1986 sediments and heat-flow measurements
MAR, 8 10'S	active, inferred	mid-ocean ridge	S MAR	-8.1670	-13.4670	2000	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
CIR, 8-17 S, Segment 7	active, inferred	mid-ocean ridge	CIR	-17.0000	66.8000	3100	2010 plume only
SWIR, D36	active, inferred	mid-ocean ridge	SWIR	-52.7490	11.7110	3981	2000-2001 plume and dredge only
GEISEIR site 25, segment M4	active, inferred	mid-ocean ridge	SEIR	-43.3115	92.1335	2700	2009 plume only
Gorda Ridge, GR-15	active, inferred	mid-ocean ridge	Gorda Ridge	42.9500	-126.5500	3365	1985 plume only
Carlsberg Ridge, CR2003	active, inferred	mid-ocean ridge	Carlsberg Ridge	6.0500	60.9500	3500	2003 plume only; 2007 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)
MAR, 23 S	active, inferred	mid-ocean ridge	S MAR	-23.7428	-13.3936	2880	2013 plume only
EPR, 29.5 S, Segment E1	active, inferred	mid-ocean ridge	S EPR	-29.5000	-111.7200	2580	1998 plume only
GEISEIR site 36, segment O3	active, inferred	mid-ocean ridge	SEIR	-47.7009	98.0631	2700	2009 plume only
Pobeda-1	active, inferred	mid-ocean ridge	N MAR	17.1500	-46.4200	3100	2014/2015 video profiling, TVgrab and corer
Carlsberg Ridge, 63 40'E	active, inferred	mid-ocean ridge	Carlsberg Ridge	3.7000	63.6666	3500	2007 plume only
Tevnia	active, inferred	mid-ocean ridge	N EPR	10.3333	-103.5533	2925	1994 submersible Alvin did not confirm activity
S AMAR 1	active, inferred	mid-ocean ridge	N MAR	36.0830	-34.0830	2630	1992 plume only; 1994 plume only
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
SWIR, 53.2 E	active, inferred	mid-ocean ridge	SWIR	-36.1010	53.2550	2218	2008 plume and dredge only
GEISEIR site 5, segment K1	active, inferred	mid-ocean ridge	SEIR	-41.2420	81.1580	2860	1996 plume only; 2007 plume only
MAR, 27 N	active, inferred	mid-ocean ridge	N MAR	27.0000	-44.5000	2900	1993 plume only
Knipovich Ridge, 75 N	active, inferred	mid-ocean ridge	Knipovich Ridge	74.8000	8.4417	3185	2000 plume only
EPR, 15 24'S	active, inferred	mid-ocean ridge	S EPR	-15.4000	-112.8350	2640	1993 plume 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
EPR, 1 S	active, inferred	mid-ocean ridge	S EPR	-0.8000	-102.4600	2800	2005 plume only
SWIR, D50B	active, inferred	mid-ocean ridge	SWIR	-52.4200	12.7480	3913	2000-2001 plume and dredge only
TaiJi	active, inferred	mid-ocean ridge	S MAR	-13.5900	-14.5200	3180	2011 plume only
GEISEIR site 26, segment M4	active, inferred	mid-ocean ridge	SEIR	-43.6901	92.8451	2500	2009 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
EPR, southern 16 N segment	active, inferred	mid-ocean ridge	N EPR	15.5000	-105.4000	2300	1997 plume only
MAR, 19 S	active, inferred	mid-ocean ridge	S MAR	-19.3301	-11.9421	2707	2013 plume only
EPR, 29.8 S, Segment E1	active, inferred	mid-ocean ridge	S EPR	-29.8000	-111.7300	2580	1998 plume only
GEISEIR site 37, segment O4	active, inferred	mid-ocean ridge	SEIR	-47.7483	98.1756	2800	2009 plume only
SEIR-WXC25	active, inferred	mid-ocean ridge	SEIR	-50.2500	131.9000	3050	2015 plume only
GEISEIR site 15, segment L1	active, inferred	mid-ocean ridge	SEIR	-41.2230	86.3892	2500	2010 plume only
Lucky Strike segment, southern end	active, inferred	mid-ocean ridge	N MAR	37.0500	-32.4200	2600	1994 plume only
Chile Rise, Segment N8	active, inferred	mid-ocean ridge	Chile Rise	-38.7167	-91.5667	3330	1998 plume only
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
Eye of Mordor Seamount	active, inferred	mid-ocean ridge	Galapagos Rift	1.9410	-91.3100	1555	2005 plume only
MAR, 17 S	active, inferred	mid-ocean ridge	S MAR	-17.2522	-14.2270	3280	2013 plume only
SWIR, Plume 1, Segment 17	active, inferred	mid-ocean ridge	SWIR	-31.1830	58.5000	3600	1997 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 4, segment K1	active, inferred	mid-ocean ridge	SEIR	-41.2025	81.0625	2800	2010 plume only
MAR, 30 N	active, inferred	mid-ocean ridge	N MAR	30.0333	-42.5000	3400	1993 plume only
Kebrit Deep	active, inferred	mid-ocean ridge	Red Sea	24.7233	36.2767	1590	1972 deposits 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
EPR, 16 08'S	active, inferred	mid-ocean ridge	S EPR	-16.1300	-113.0000	2640	1993 plume only
EPR, 20 S	active, inferred	mid-ocean ridge	S EPR	-20.0333	-113.6843	3000	1999 submersible Alvin did not confirm activity
SWIR, D54	active, inferred	mid-ocean ridge	SWIR	-52.4370	13.3120	4029	2000-2001 plume and dredge only
Rainbow Bay	active, inferred	mid-ocean ridge	S MAR	-14.0300	-14.3400	2900	2009 towed video did not confirm activity
GEISEIR site 27, segment M5	active, inferred	mid-ocean ridge	SEIR	-43.9805	93.4571	2700	2009 plume only
SEIR-WXC22	active, inferred	mid-ocean ridge	SEIR	-50.2500	132.1000	2950	2015 plume only
EPR, 30.1 S, Segment E1	active, inferred	mid-ocean ridge	S EPR	-30.1330	-111.7640	2480	1998 plume only
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)
GEISEIR site 38, segment O4	active, inferred	mid-ocean ridge	SEIR	-48.0048	98.8232	2800	2009 plume only
GEISEIR site 6, segment K2	active, inferred	mid-ocean ridge	SEIR	-41.6600	81.6617	2600	2007 plume only; 2010 plume only
EPR/Tamayo intersection	active, inferred	mid-ocean ridge	N EPR	22.9333	-108.0667	3200	1979 submersible Alvin did not confirm activity
GEISEIR site 16, segment L3	active, inferred	mid-ocean ridge	SEIR	-41.5883	87.2615	2500	2010 plume only
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)
Chile Rise, Segment N9A	active, inferred	mid-ocean ridge	Chile Rise	-39.0500	-91.5833	3450	1998 plume only
MAR, 25 S	active, inferred	mid-ocean ridge	S MAR	-25.3350	-13.6305	2570	2013 plume only
SWIR, Plume 2, Segment 16	active, inferred	mid-ocean ridge	SWIR	-31.0670	58.9670	4200	1997 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 28, segment M6	active, inferred	mid-ocean ridge	SEIR	-44.7237	94.6039	2700	2009 plume only
Shaban Deep	active, inferred	mid-ocean ridge	Red Sea	26.2250	35.3500	1540	1983 deposits only
Knipovich Ridge, 77 40'N	active, inferred	mid-ocean ridge	Knipovich Ridge	77.6300	7.5800	3000	2000 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
SWIR, D9B	active, inferred	mid-ocean ridge	SWIR	-52.7070	18.8170	3931	2000-2001 plume and dredge only
SEIR-WXC17	active, inferred	mid-ocean ridge	SEIR	-50.3000	133.8000	2780	2015 plume 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
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
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)
MAR, segment south of St. Paul system	active, inferred	mid-ocean ridge	N MAR	0.5000	-25.0000	3500	2013 plume only
EPR, 17 47'S	active, inferred	mid-ocean ridge	S EPR	-17.7900	-113.3000	2600	1993 plume only
EPR, 30.4 S, Segment E2	active, inferred	mid-ocean ridge	S EPR	-30.3750	-111.7640	2320	1998 plume only
CIR, 8-17 S, Segment 1	active, inferred	mid-ocean ridge	CIR	-8.2500	68.2000	3600	2010 plume only
SWIR, unnamed, Segment 26	active, inferred	mid-ocean ridge	SWIR	-37.6080	50.8527	2800	2008 dredge only DY115-20 Leg 6
GEISEIR site 10, segment K4	active, inferred	mid-ocean ridge	SEIR	-42.4770	82.7100	2500	1996 plume only; 2010 plume only
GEISEIR site 8, segment K3	active, inferred	mid-ocean ridge	SEIR	-41.8833	81.9816	2800	2010 plume only
GEISEIR site 17, segment L3	active, inferred	mid-ocean ridge	SEIR	-41.6498	87.3481	2500	2010 plume only
Gakkel Ridge, Site 6	active, inferred	mid-ocean ridge	Gakkel Ridge	86.5333	43.0000	3000	2001 plume only
CIR, 8-17 S, Segment 2	active, inferred	mid-ocean ridge	CIR	-9.9000	66.7500	4000	2010 plume only
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)
MAR, 30.8 S	active, inferred	mid-ocean ridge	S MAR	-30.8327	-13.4690	2950	2013 plume only
GEISEIR site 29, segment M6	active, inferred	mid-ocean ridge	SEIR	-44.9054	94.9673	2700	2009 plume only
Nereus Deep	active, inferred	mid-ocean ridge	Red Sea	23.1670	37.2830	2400	1972 deposits only
Lucky B	active, inferred	mid-ocean ridge	Lena Trough	81.3610	-3.4400	4000	1999 dredging only
Mohns Ridge, 72 N	active, inferred	mid-ocean ridge	Mohns Ridge	72.0390	-0.2520	2500	1987 plume only; 2013 plume only
EPR, 16 24'S	active, inferred	mid-ocean ridge	S EPR	-16.4000	-113.0500	2640	1993 plume only
MAR, 11 26'N	active, inferred	mid-ocean ridge	N MAR	11.4482	-43.7035	3835	2009 plume only
EPR, 2 S, off-axis	active, inferred	mid-ocean ridge	S EPR	-2.0840	-102.8270	3000	2008 plume only
Galapagos Rift, 95.5 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.6700	-95.4500	3200	1990 submersible Alvin did not confirm activity
SEIR-WXC27	active, inferred	mid-ocean ridge	SEIR	-50.4000	134.3000	2760	2015 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
MAR, 43 N	active, inferred	mid-ocean ridge	N MAR	43.0000	-29.0000	3400	1986 or earlier plume only
Su Causeway	active, inferred	mid-ocean ridge	SWIR	-38.1000	48.6000	3000	2014 leg 2 or 3 of the 30th Chinese Cruise
EPR, 17 53'S	active, inferred	mid-ocean ridge	S EPR	-17.8800	-113.3000	2610	1993 plume only
EPR, 30.8 S, Segment E2	active, inferred	mid-ocean ridge	S EPR	-30.7500	-111.8770	2360	1998 plume only
Logatchev-3	active, inferred	mid-ocean ridge	N MAR	14.7083	-44.9667	3100	1993-1999 (between these dates)
MAR, 31 S	active, inferred	mid-ocean ridge	S MAR	-31.7377	-13.3772	3050	2013 plume only
SWIR, D57	active, inferred	mid-ocean ridge	SWIR	-52.2240	13.7380	3517	2000-2001 plume and dredge 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 9, segment K3	active, inferred	mid-ocean ridge	SEIR	-41.9633	82.0600	2700	2010 plume only
GEISEIR site 18, segment L3	active, inferred	mid-ocean ridge	SEIR	-41.7133	87.4375	2500	2010 plume only
N Oceanographer	active, inferred	mid-ocean ridge	N MAR	35.2830	-34.8670	2600	1992 plume only
Gakkel Ridge, Site 7	active, inferred	mid-ocean ridge	Gakkel Ridge	86.9833	55.5000	3800	2001 plume only
Magic Mountain, 3-km south	active, inferred	mid-ocean ridge	Explorer Ridge	49.7250	-130.2667	1850	2002 AUV ABE plume only
CIR, 8-17 S, Segment 3	active, inferred	mid-ocean ridge	CIR	-10.6600	66.5000	3500	2010 plume only
Aden	active, confirmed	mid-ocean ridge	Aden Ridge	11.9500	43.6667	1600	1984 submersible Cyana
High-Rise Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9666	-129.0894	2200	1988 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
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
Axial Seamount, International District	active, confirmed	mid-ocean ridge	JdF Ridge	45.9266	-129.9795	1544	1986 submersible Pisces IV
EPR, 26.5 S	active, confirmed	mid-ocean ridge	S EPR	-26.4833	-112.6250	2064	1993 submersible Nautile (or earlier)
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
Aegir	active, confirmed	mid-ocean ridge	Mohns Ridge	72.3440	1.5550	2600	2015 ROV Ægir 6000; 2013 plume only; 2015 AUV
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, 21 25'S	active, confirmed	mid-ocean ridge	S EPR	-21.4333	-114.2917	2850	1984 submersible Cyana; 1983 deposits only
Mothra Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9233	-129.1082	2270	1996 ROV ROPOS; 1986 plume only
Loki's Castle	active, confirmed	mid-ocean ridge	Mohns Ridge	73.5500	8.1500	2400	2008 ROV Bathysaurus
Ribeira Quente	active, confirmed	mid-ocean ridge	Terceira Rift	37.7250	-25.3160	10	1986 or earlier, likely from shore or by SCUBA
Dodo Field	active, confirmed	mid-ocean ridge	CIR	-18.3470	65.3050	2730	2009 submersible Shinkai 6500; 2006 plume only
Nolan's Nook	active, confirmed	mid-ocean ridge	S EPR	-31.1500	-111.9167	2330	1999 submersible Alvin; 1998 plume 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
Calyfield	active, confirmed	mid-ocean ridge	Galapagos Rift	0.8300	-89.6083	1660	2002 submersible Alvin
EPR, 9 50'N	active, confirmed	mid-ocean ridge	N EPR	9.8300	-104.2900	2520	1989 Argo I towed video
EPR, Ridge 1, 20 40'S	active, confirmed	mid-ocean ridge	S EPR	-20.8333	-114.1667	3000	1983 Deep Tow camera
EPR, 10 02'N	active, confirmed	mid-ocean ridge	N EPR	10.0330	-104.3300	2560	1992 submersible Alvin
Floc	active, confirmed	mid-ocean ridge	JdF Ridge	46.3133	-129.7050	2290	1993 DEEPTOW and submersible Alvin
Kolbeinsey Field	active, confirmed	mid-ocean ridge	Kolbeinsey Ridge	67.0833	-18.7167	110	1988 submersible GEO
EPR, 17 12'S	active, confirmed	mid-ocean ridge	S EPR	-17.2000	-113.1500	2590	1993 submersible Nautile
Alarcon Rise, Ja Sit	active, confirmed	mid-ocean ridge	Gulf of California	23.3765	-108.5315	2304	2012 ROV Doc Ricketts
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, 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, 18 15'S	active, confirmed	mid-ocean ridge	S EPR	-18.2500	-113.3500	2680	1993 submersible Nautile
Lilliput	active, confirmed	mid-ocean ridge	S MAR	-9.5500	-13.1800	1500	2005 ROV Quest
Central Cleft, off-axis	active, confirmed	mid-ocean ridge	JdF Ridge	44.7583	-130.2750	2200	2000 ROV Tiburon
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
Source	active, confirmed	mid-ocean ridge	JdF Ridge	46.1550	-129.8100	2055	1993 submersible Alvin
Menez Hom	active, confirmed	mid-ocean ridge	N MAR	37.1500	-32.4333	1802	2002 ROV Victor 6000
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
Alarcon Rise, Meyibo	active, confirmed	mid-ocean ridge	Gulf of California	23.3553	-108.5443	2295	2012 ROV Doc Ricketts
NESCA	active, confirmed	mid-ocean ridge	Gorda Ridge	41.0000	-127.4917	3300	1988 submersible Alvin; 1986 dredge and photographs did not confirm activity
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
Don Joao de Castro Bank	active, confirmed	mid-ocean ridge	Terceira Rift	38.2300	-26.6300	45	1995 SCUBA
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
Longqi	active, confirmed	mid-ocean ridge	SWIR	-37.7838	49.6494	2785	2007 towed video sled followed by AUV ABE; 2005 plume only
EPR, 9 17'N	active, confirmed	mid-ocean ridge	N EPR	9.2800	-104.2166	2585	1989 Argo I towed video
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)
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
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
Navidad	active, confirmed	mid-ocean ridge	Galapagos Rift	2.5300	-94.0750	2380	2005 towed video Medea
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;
Alarcon Rise, Tzab-ek	active, confirmed	mid-ocean ridge	Gulf of California	23.3526	-108.5597	2249	2015 ROV Doc Ricketts
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
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)
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
Sasquatch Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9969	-129.0662	2200	2000 submersible Alvin
Semyenov-2	active, confirmed	mid-ocean ridge	N MAR	13.5137	-44.9630	2440	2009 TV grab and photo-TV profiling; 2007 deposits 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)
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)
Teotihuacan	active, confirmed	mid-ocean ridge	N EPR	15.7333	-105.4333	2300	2010 submersible Nautile; 1997 plume only
EPR, 9 30'N	active, confirmed	mid-ocean ridge	N EPR	9.5167	-104.2414	2580	1989 Argo I towed video
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
Soria Moria	active, confirmed	mid-ocean ridge	Mohns Ridge	71.2593	-5.8146	750	2005 ROV BIODEEP-05 cruise
Beebe	active, confirmed	mid-ocean ridge	Mid-Cayman Rise	18.5466	-81.7182	4957	2010 AUV Autosub6000 and HyBIS TVG; 2009 plume only
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
Von Damm	active, confirmed	mid-ocean ridge	Mid-Cayman Rise	18.3777	-81.7972	2372	2010 AUV Autosub6000 and HyBIS TVG; 2009 plume only
Feather Duster	active, confirmed	mid-ocean ridge	N EPR	10.9267	-103.6767	2520	1984 towed camera and submersible Alvin
Evan	active, confirmed	mid-ocean ridge	N MAR	37.2667	-32.2833	1775	2006 submersible Nautile
Guaymas Basin, Northern Trough_2	active, confirmed	mid-ocean ridge	Gulf of California	27.4110	-111.3879	1800	2015 ROV Hybis
Salty Dawg Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9822	-129.0756	2200	1995 submersible Alvin, followed by ROV ROPOS
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
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
EPR, 18 32'S	active, confirmed	mid-ocean ridge	S EPR	-18.5550	-113.4160	2647	1993 submersible Nautile
Zouyu ridge	active, confirmed	mid-ocean ridge	S MAR	-13.2800	-14.4100	2315	2009 towed video
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
Medusa	active, confirmed	mid-ocean ridge	N EPR	9.1404	-104.2065	2580	2007 ROV Jason II; 1991 plume only
Flow	active, confirmed	mid-ocean ridge	JdF Ridge	46.5250	-129.5783	2390	1993 ROV ROPOS
Troll Wall	active, confirmed	mid-ocean ridge	Mohns Ridge	71.2833	-5.7667	550	2005 ROV BIODEEP-05 cruise
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
Pito Seamount	active, confirmed	mid-ocean ridge	S EPR	-23.3275	-111.6402	2270	1993 submersible Nautile
Lucky Strike	active, confirmed	mid-ocean ridge	N MAR	37.2933	-32.2733	1740	1993 submersible Alvin; 1992 dredge and plume only
Saguaro Field	active, confirmed	mid-ocean ridge	S EPR	-31.8500	-112.0333	2330	1999 submersible Alvin; 1998 plume only
Iguanas-Pinguinos	active, confirmed	mid-ocean ridge	Galapagos Rift	2.1000	-91.9350	1640	2005 towed video Medea
Luso	active, confirmed	mid-ocean ridge	N MAR	38.9833	-29.8833	570	2018 ROV Luso
Ringvent	active, confirmed	mid-ocean ridge	Gulf of California	27.5083	-111.6792	1740	2016 submersible Alvin; 2009 towed camera/CTD/bottles
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
Nibelungen	active, confirmed	mid-ocean ridge	S MAR	-8.3000	-13.5200	2900	2006 AUV ABE followed by ROV Quest; 2004 plume only
Middle Valley, Dead Dog Vent Field	active, confirmed	mid-ocean ridge	JdF Ridge	48.4560	-128.7088	2450	1990 HOV Alvin
Tempus Fugit	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7683	-85.9100	2560	2011 ROV Little Hercules
EPR, 20 06'S	active, confirmed	mid-ocean ridge	S EPR	-20.1000	-113.7080	3000	1981 Angus camera tow; 1984 submersible Cyana
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
North Cleft, low temperature	active, confirmed	mid-ocean ridge	JdF Ridge	44.8833	-130.2667	2250	1987-1989 camera/CTD tows
Eyjafjördur	active, confirmed	mid-ocean ridge	Kolbeinsey Ridge	65.8500	-18.1333	65	1997, likely by SCUBA
Stealth	active, confirmed	mid-ocean ridge	S EPR	-17.6167	-113.2330	2600	1996 Argo II towed video; 1993 plume only; 1998 submersible Alvin
Rapa Nui	active, confirmed	mid-ocean ridge	S EPR	-21.5620	-114.3000	2845	1999 submersible Alvin; 1987-1988 deposits only
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, 10 44.6'N	active, confirmed	mid-ocean ridge	N EPR	10.7433	-103.6500	2580	1985 Argo video tow with temperature
Rainbow	active, confirmed	mid-ocean ridge	N MAR	36.2300	-33.9020	2320	1997 submersible Nautile
AHA Field	active, confirmed	mid-ocean ridge	N EPR	1.7333	-102.2830	2850	2000 towed imaging ARGO-II
Middle Valley, Bent Hill Massive Sulfide	active, confirmed	mid-ocean ridge	JdF Ridge	48.4341	-128.6812	2440	1990 HOV Alvin, 1985 deposits only
Pegasus	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7500	-88.2000	2000	2011 ROV Little Hercules
Ashadze-1	active, confirmed	mid-ocean ridge	N MAR	12.9733	-44.8633	4200	2003 TV profiling; 2007 ROV Victor 6000
EPR, 1.4 S, off-axis	active, confirmed	mid-ocean ridge	S EPR	-1.3690	-102.4560	3000	2008 towed video
Kairei Field	active, confirmed	mid-ocean ridge	CIR	-25.3195	70.0400	2460	2000 ROV Kaiko; 1993 plume only
Precious Stone Mountain	active, confirmed	mid-ocean ridge	Galapagos Rift	1.2200	-101.4900	1700	2009 deep-tow video and TV grab
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
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
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)
Deyin-1	active, confirmed	mid-ocean ridge	S MAR	-15.1666	-13.3558	2850	2012 TV-grab; 2011 deposits only; 2013 plume only
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
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)
Menez Gwen	active, confirmed	mid-ocean ridge	N MAR	37.8417	-31.5250	865	1994 submersible Nautile
Saldanha	active, confirmed	mid-ocean ridge	N MAR	36.5667	-33.4333	2300	1998 submersible Nautile
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
TAG	active, confirmed	mid-ocean ridge	N MAR	26.1367	-44.8267	3670	1985 towed camera and temperature anomaly; 1986 submersible Alvin
Baby Bare Seamount	active, confirmed	mid-ocean ridge	JdF Ridge	47.7100	-127.7870	2600	1995 submersible Alvin
Uka Pacha	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7700	-88.3000	2100	2011 ROV Little Hercules
EPR, 2 S	active, confirmed	mid-ocean ridge	S EPR	-2.2200	-102.6550	2900	2008 towed video and AUV ABE
Animal Farm	active, confirmed	mid-ocean ridge	S EPR	-18.6080	-113.4000	2675	1993 submersible Nautile
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
South Cleft	active, confirmed	mid-ocean ridge	JdF Ridge	44.6667	-130.3667	2250	1981 deep-tow photographs; 1984 submersible Alvin
Axial Seamount, ASHES	active, confirmed	mid-ocean ridge	JdF Ridge	45.9333	-130.0140	1540	1984 submersible Alvin
Grimsey Field	active, confirmed	mid-ocean ridge	Kolbeinsey Ridge	66.6067	-17.6542	400	1997 submersible Jago
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, 9 33'N	active, confirmed	mid-ocean ridge	N EPR	9.5583	-104.2500	2574	1989 Argo I towed video; 1991 submersible Alvin
Lost City	active, confirmed	mid-ocean ridge	N MAR	30.1250	-42.1183	800	2000 towed video ARGO-II and submersible Alvin
Magic Mountain	active, confirmed	mid-ocean ridge	Explorer Ridge	49.7500	-130.2667	1850	1984 submersible Pisces IV
Main Endeavour Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9487	-129.0981	2220	1984 submersible Alvin; 1982 dredge only
EPR, Ridge 3, 20 40'S	active, confirmed	mid-ocean ridge	S EPR	-20.3333	-113.6792	3050	1983 Deep Tow camera
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
Edmond Field	active, confirmed	mid-ocean ridge	CIR	-23.8780	69.5960	3320	2001 ROV Jason
East Blanco Depression	active, confirmed	mid-ocean ridge	JdF Ridge	44.2170	-129.6250	3460	1994 ROV U.S. Navy's Advanced Tethered Vehicle
Solitaire Field	active, confirmed	mid-ocean ridge	CIR	-19.5450	65.8500	2630	2009 submersible Shinkai 6500; 2006 plume only
Axial Seamount, CASM	active, confirmed	mid-ocean ridge	JdF Ridge	45.9892	-130.0272	1580	1983 submersible Pisces IV
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, 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
Galapagos Mounds	active, confirmed	mid-ocean ridge	Galapagos Rift	1.4500	-86.1665	2700	1977 submersible Alvin
Red Seamount	active, confirmed	mid-ocean ridge	N EPR	20.8033	-109.3783	2000	1982 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, 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

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