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.
You can sort the list below by clicking on a column header.

Vent Field Name ID	Activity	Tectonic Setting	Region	Latitude	Longitude	Maximum or Single Reported Depth	Year and How Discovered
East Blanco Depression	active, confirmed	mid-ocean ridge	JdF Ridge	44.2170	-129.6250	3460	1994 ROV U.S. Navy's Advanced Tethered Vehicle
EPR, Ridge 1, 20 40'S	active, confirmed	mid-ocean ridge	S EPR	-20.8333	-114.1667	3000	1983 Deep Tow camera
Semyenov-2	active, confirmed	mid-ocean ridge	N MAR	13.5137	-44.9630	2440	2009 TV grab and photo-TV profiling; 2007 deposits 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
Troll Wall	active, confirmed	mid-ocean ridge	Mohns Ridge	71.2833	-5.7667	550	2005 ROV BIODEEP-05 cruise
Middle Valley, Dead Dog Vent Field	active, confirmed	mid-ocean ridge	JdF Ridge	48.4560	-128.7088	2450	1990 HOV Alvin
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
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)
Beebe	active, confirmed	mid-ocean ridge	Mid-Cayman Rise	18.5466	-81.7182	4957	2010 AUV Autosub6000 and HyBIS TVG; 2009 plume only
Lucky Strike	active, confirmed	mid-ocean ridge	N MAR	37.2933	-32.2733	1740	1993 submersible Alvin; 1992 dredge and plume only
Red Seamount	active, confirmed	mid-ocean ridge	N EPR	20.8033	-109.3783	2000	1982 submersible Alvin
EPR, 9 30'N	active, confirmed	mid-ocean ridge	N EPR	9.5167	-104.2414	2580	1989 Argo I towed video
Solitaire Field	active, confirmed	mid-ocean ridge	CIR	-19.5450	65.8500	2630	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
EPR, 18 15'S	active, confirmed	mid-ocean ridge	S EPR	-18.2500	-113.3500	2680	1993 submersible Nautile
Middle Valley, Bent Hill Massive Sulfide	active, confirmed	mid-ocean ridge	JdF Ridge	48.4341	-128.6812	2440	1990 HOV Alvin, 1985 deposits only
Galapagos Mounds	active, confirmed	mid-ocean ridge	Galapagos Rift	1.4500	-86.1665	2700	1977 submersible Alvin
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
Eyjafjördur	active, confirmed	mid-ocean ridge	Kolbeinsey Ridge	65.8500	-18.1333	65	1997, likely by SCUBA
Ribeira Quente	active, confirmed	mid-ocean ridge	Terceira Rift	37.7250	-25.3160	10	1986 or earlier, likely from shore or by SCUBA
Feather Duster	active, confirmed	mid-ocean ridge	N EPR	10.9267	-103.6767	2520	1984 towed camera and submersible Alvin
Aden	active, confirmed	mid-ocean ridge	Aden Ridge	11.9500	43.6667	1600	1984 submersible Cyana
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
Medusa	active, confirmed	mid-ocean ridge	N EPR	9.1404	-104.2065	2580	2007 ROV Jason II; 1991 plume only
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
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
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, 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
Baby Bare Seamount	active, confirmed	mid-ocean ridge	JdF Ridge	47.7100	-127.7870	2600	1995 submersible Alvin
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
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)
Axial Seamount, ASHES	active, confirmed	mid-ocean ridge	JdF Ridge	45.9333	-130.0140	1540	1984 submersible Alvin
Menez Gwen	active, confirmed	mid-ocean ridge	N MAR	37.8417	-31.5250	865	1994 submersible Nautile
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
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
Dodo Field	active, confirmed	mid-ocean ridge	CIR	-18.3470	65.3050	2730	2009 submersible Shinkai 6500; 2006 plume only
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
Magic Mountain	active, confirmed	mid-ocean ridge	Explorer Ridge	49.7500	-130.2667	1850	1984 submersible Pisces IV
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)
Main Endeavour Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9487	-129.0981	2220	1984 submersible Alvin; 1982 dredge 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
Calyfield	active, confirmed	mid-ocean ridge	Galapagos Rift	0.8300	-89.6083	1660	2002 submersible Alvin
Ashadze-1	active, confirmed	mid-ocean ridge	N MAR	12.9733	-44.8633	4200	2003 TV profiling; 2007 ROV Victor 6000
Stealth	active, confirmed	mid-ocean ridge	S EPR	-17.6167	-113.2330	2600	1996 Argo II towed video; 1993 plume only; 1998 submersible Alvin
Grimsey Field	active, confirmed	mid-ocean ridge	Kolbeinsey Ridge	66.6067	-17.6542	400	1997 submersible Jago
Axial Seamount, CASM	active, confirmed	mid-ocean ridge	JdF Ridge	45.9892	-130.0272	1580	1983 submersible Pisces IV
EPR, 10 02'N	active, confirmed	mid-ocean ridge	N EPR	10.0330	-104.3300	2560	1992 submersible Alvin
EPR, 10 44.6'N	active, confirmed	mid-ocean ridge	N EPR	10.7433	-103.6500	2580	1985 Argo video tow with temperature
Kairei Field	active, confirmed	mid-ocean ridge	CIR	-25.3195	70.0400	2460	2000 ROV Kaiko; 1993 plume only
AHA Field	active, confirmed	mid-ocean ridge	N EPR	1.7333	-102.2830	2850	2000 towed imaging ARGO-II
Alarcon Rise, Ja Sit	active, confirmed	mid-ocean ridge	Gulf of California	23.3765	-108.5315	2304	2012 ROV Doc Ricketts
EPR, 18 32'S	active, confirmed	mid-ocean ridge	S EPR	-18.5550	-113.4160	2647	1993 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
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
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
High-Rise Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9666	-129.0894	2200	1988 submersible Alvin
NESCA	active, confirmed	mid-ocean ridge	Gorda Ridge	41.0000	-127.4917	3300	1988 submersible Alvin; 1986 dredge and photographs 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
Lilliput	active, confirmed	mid-ocean ridge	S MAR	-9.5500	-13.1800	1500	2005 ROV Quest
Pito Seamount	active, confirmed	mid-ocean ridge	S EPR	-23.3275	-111.6402	2270	1993 submersible Nautile
Axial Seamount, International District	active, confirmed	mid-ocean ridge	JdF Ridge	45.9266	-129.9795	1544	1986 submersible Pisces IV
Central Cleft, off-axis	active, confirmed	mid-ocean ridge	JdF Ridge	44.7583	-130.2750	2200	2000 ROV Tiburon
Aurora	active, confirmed	mid-ocean ridge	Gakkel Ridge	82.8833	-6.2500	4100	2001 shimmering water in camera tow and sulfide chimney in dredge
Alarcon Rise, Meyibo	active, confirmed	mid-ocean ridge	Gulf of California	23.3553	-108.5443	2295	2012 ROV Doc Ricketts
EPR, 20 06'S	active, confirmed	mid-ocean ridge	S EPR	-20.1000	-113.7080	3000	1981 Angus camera tow; 1984 submersible Cyana
Mothra Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9233	-129.1082	2270	1996 ROV ROPOS; 1986 plume only
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
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)
Rapa Nui	active, confirmed	mid-ocean ridge	S EPR	-21.5620	-114.3000	2845	1999 submersible Alvin; 1987-1988 deposits only
Teotihuacan	active, confirmed	mid-ocean ridge	N EPR	15.7333	-105.4333	2300	2010 submersible Nautile; 1997 plume only
EPR, 9 33'N	active, confirmed	mid-ocean ridge	N EPR	9.5583	-104.2500	2574	1989 Argo I towed video; 1991 submersible Alvin
Edmond Field	active, confirmed	mid-ocean ridge	CIR	-23.8780	69.5960	3320	2001 ROV Jason
Loki's Castle	active, confirmed	mid-ocean ridge	Mohns Ridge	73.5500	8.1500	2400	2008 ROV Bathysaurus
Saguaro Field	active, confirmed	mid-ocean ridge	S EPR	-31.8500	-112.0333	2330	1999 submersible Alvin; 1998 plume only
Alarcon Rise, Tzab-ek	active, confirmed	mid-ocean ridge	Gulf of California	23.3526	-108.5597	2249	2015 ROV Doc Ricketts
Navidad	active, confirmed	mid-ocean ridge	Galapagos Rift	2.5300	-94.0750	2380	2005 towed video Medea
Floc	active, confirmed	mid-ocean ridge	JdF Ridge	46.3133	-129.7050	2290	1993 DEEPTOW and submersible Alvin
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
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, 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 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
Von Damm	active, confirmed	mid-ocean ridge	Mid-Cayman Rise	18.3777	-81.7972	2372	2010 AUV Autosub6000 and HyBIS TVG; 2009 plume only
EPR, 9 40'N	active, confirmed	mid-ocean ridge	N EPR	9.6500	-104.2600	2572	1989 Argo I towed video; 1991 submersible Alvin
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
Kolbeinsey Field	active, confirmed	mid-ocean ridge	Kolbeinsey Ridge	67.0833	-18.7167	110	1988 submersible GEO
Tempus Fugit	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7683	-85.9100	2560	2011 ROV Little Hercules
Rainbow	active, confirmed	mid-ocean ridge	N MAR	36.2300	-33.9020	2320	1997 submersible Nautile
Animal Farm	active, confirmed	mid-ocean ridge	S EPR	-18.6080	-113.4000	2675	1993 submersible Nautile
Source	active, confirmed	mid-ocean ridge	JdF Ridge	46.1550	-129.8100	2055	1993 submersible Alvin
Zouyu ridge	active, confirmed	mid-ocean ridge	S MAR	-13.2800	-14.4100	2315	2009 towed video
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, 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, 9 47'N	active, confirmed	mid-ocean ridge	N EPR	9.7750	-104.2802	2560	1989 Argo I towed video; 1991 submersible Alvin
Iguanas-Pinguinos	active, confirmed	mid-ocean ridge	Galapagos Rift	2.1000	-91.9350	1640	2005 towed video Medea
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
Pegasus	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7500	-88.2000	2000	2011 ROV Little Hercules
Saldanha	active, confirmed	mid-ocean ridge	N MAR	36.5667	-33.4333	2300	1998 submersible Nautile
Ringvent	active, confirmed	mid-ocean ridge	Gulf of California	27.5083	-111.6792	1740	2016 submersible Alvin; 2009 towed camera/CTD/bottles
North Cleft, low temperature	active, confirmed	mid-ocean ridge	JdF Ridge	44.8833	-130.2667	2250	1987-1989 camera/CTD tows
EPR, Ridge 3, 20 40'S	active, confirmed	mid-ocean ridge	S EPR	-20.3333	-113.6792	3050	1983 Deep Tow camera
Don Joao de Castro Bank	active, confirmed	mid-ocean ridge	Terceira Rift	38.2300	-26.6300	45	1995 SCUBA
Deyin-1	active, confirmed	mid-ocean ridge	S MAR	-15.1666	-13.3558	2850	2012 TV-grab; 2011 deposits only; 2013 plume only
TAG	active, confirmed	mid-ocean ridge	N MAR	26.1367	-44.8267	3670	1985 towed camera and temperature anomaly; 1986 submersible Alvin
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
Nibelungen	active, confirmed	mid-ocean ridge	S MAR	-8.3000	-13.5200	2900	2006 AUV ABE followed by ROV Quest; 2004 plume only
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, 9 50'N	active, confirmed	mid-ocean ridge	N EPR	9.8300	-104.2900	2520	1989 Argo I towed video
EPR, 17 12'S	active, confirmed	mid-ocean ridge	S EPR	-17.2000	-113.1500	2590	1993 submersible Nautile
Uka Pacha	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7700	-88.3000	2100	2011 ROV Little Hercules
Lost City	active, confirmed	mid-ocean ridge	N MAR	30.1250	-42.1183	800	2000 towed video ARGO-II and submersible Alvin
Sasquatch Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9969	-129.0662	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
Guaymas Basin, Northern Trough_2	active, confirmed	mid-ocean ridge	Gulf of California	27.4110	-111.3879	1800	2015 ROV Hybis
EPR, 1.4 S, off-axis	active, confirmed	mid-ocean ridge	S EPR	-1.3690	-102.4560	3000	2008 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
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
EPR, 26.5 S	active, confirmed	mid-ocean ridge	S EPR	-26.4833	-112.6250	2064	1993 submersible Nautile (or earlier)
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, 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
Precious Stone Mountain	active, confirmed	mid-ocean ridge	Galapagos Rift	1.2200	-101.4900	1700	2009 deep-tow video and TV grab
EPR, 21 25'S	active, confirmed	mid-ocean ridge	S EPR	-21.4333	-114.2917	2850	1984 submersible Cyana; 1983 deposits only
Soria Moria	active, confirmed	mid-ocean ridge	Mohns Ridge	71.2593	-5.8146	750	2005 ROV BIODEEP-05 cruise
Salty Dawg Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9822	-129.0756	2200	1995 submersible Alvin, followed by ROV ROPOS
South Cleft	active, confirmed	mid-ocean ridge	JdF Ridge	44.6667	-130.3667	2250	1981 deep-tow photographs; 1984 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
Luso	active, confirmed	mid-ocean ridge	N MAR	38.9833	-29.8833	570	2018 ROV Luso
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, 2 S	active, confirmed	mid-ocean ridge	S EPR	-2.2200	-102.6550	2900	2008 towed video and AUV ABE
Evan	active, confirmed	mid-ocean ridge	N MAR	37.2667	-32.2833	1775	2006 submersible Nautile
Flow	active, confirmed	mid-ocean ridge	JdF Ridge	46.5250	-129.5783	2390	1993 ROV ROPOS
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;
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, 9 17'N	active, confirmed	mid-ocean ridge	N EPR	9.2800	-104.2166	2585	1989 Argo I towed video
SWIR, D20	active, inferred	mid-ocean ridge	SWIR	-53.0200	22.1880	4170	2000-2001 plume and dredge only
MAR, 17 S	active, inferred	mid-ocean ridge	S MAR	-17.2522	-14.2270	3280	2013 plume only
GEISEIR site 10, segment K4	active, inferred	mid-ocean ridge	SEIR	-42.4770	82.7100	2500	1996 plume only; 2010 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
S AMAR 2	active, inferred	mid-ocean ridge	N MAR	35.9670	-34.1830	2240	1992 plume only; 1994 plume only
GEISEIR site 24, segment M3	active, inferred	mid-ocean ridge	SEIR	-43.0369	91.0357	2400	2009 plume only
Gakkel Ridge, Site 8	active, inferred	mid-ocean ridge	Gakkel Ridge	86.5333	69.0000	3500	2001 plume only
GEISEIR site 8, segment K3	active, inferred	mid-ocean ridge	SEIR	-41.8833	81.9816	2800	2010 plume only
Nereus Deep	active, inferred	mid-ocean ridge	Red Sea	23.1670	37.2830	2400	1972 deposits only
EPR, 27.9 S, Segment W3	active, inferred	mid-ocean ridge	S EPR	-27.8670	-112.9120	2180	1998 plume only
EPR, 2 S, off-axis	active, inferred	mid-ocean ridge	S EPR	-2.0840	-102.8270	3000	2008 plume only
Bai Causeway	active, inferred	mid-ocean ridge	SWIR	-37.9000	48.8000	3000	2014 leg 2 or 3 of the 30th Chinese Cruise
GEISEIR site 35, segment O3	active, inferred	mid-ocean ridge	SEIR	-47.6179	97.8678	2600	2009 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
SWIR, 51.7 E	active, inferred	mid-ocean ridge	SWIR	-37.4660	51.7320	1595	2008 plume and dredge only
SEIR-WXC22	active, inferred	mid-ocean ridge	SEIR	-50.2500	132.1000	2950	2015 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
Puy des Folles	active, inferred	mid-ocean ridge	N MAR	20.5083	-45.6417	2000	1996 submersible Nautile observed only inactive vents
EPR, 14 35'S	active, inferred	mid-ocean ridge	S EPR	-14.5830	-112.6670	2630	1993 plume only
Knipovich Ridge, 75 N	active, inferred	mid-ocean ridge	Knipovich Ridge	74.8000	8.4417	3185	2000 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
Gakkel Ridge, 7.5 E	active, inferred	mid-ocean ridge	Gakkel Ridge	85.0167	7.4500	3600	2001 plume only
GEISEIR site 9, segment K3	active, inferred	mid-ocean ridge	SEIR	-41.9633	82.0600	2700	2010 plume only
SWIR, D36	active, inferred	mid-ocean ridge	SWIR	-52.7490	11.7110	3981	2000-2001 plume and dredge only
MAR, 25 S	active, inferred	mid-ocean ridge	S MAR	-25.3350	-13.6305	2570	2013 plume only
GEISEIR site 22, segment L3	active, inferred	mid-ocean ridge	SEIR	-42.1130	88.0420	2400	1996 plume only; 2009 plume only
EPR, 21 40'S	active, inferred	mid-ocean ridge	S EPR	-21.6340	-114.3010	2730	1987-1988 deposits only
EPR, 17 42'S	active, inferred	mid-ocean ridge	S EPR	-17.7000	-113.2500	2600	1993 plume only
S Oceanographer	active, inferred	mid-ocean ridge	N MAR	34.8670	-36.4330	3460	1992 plume only
GEISEIR site 25, segment M4	active, inferred	mid-ocean ridge	SEIR	-43.3115	92.1335	2700	2009 plume only
Chile Triple Junction, 10 km north	active, inferred	mid-ocean ridge	Chile Rise	-46.2000	-75.8333	3000	2010 plume only
EPR, 28 S, Segment W3	active, inferred	mid-ocean ridge	S EPR	-28.0170	-112.9040	2130	1998 plume only
Lucky Strike segment, southern end	active, inferred	mid-ocean ridge	N MAR	37.0500	-32.4200	2600	1994 plume only
GEISEIR site 36, segment O3	active, inferred	mid-ocean ridge	SEIR	-47.7009	98.0631	2700	2009 plume only
EPR, Manzanillo Spreading Segment	active, inferred	mid-ocean ridge	N EPR	18.2500	-106.3000	2600	1997 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
Area EX/FX	active, inferred	mid-ocean ridge	CIR	-21.4000	68.7666	3300	1986 plume and sediments
SWIR, 53.2 E	active, inferred	mid-ocean ridge	SWIR	-36.1010	53.2550	2218	2008 plume and dredge only
SEIR-WXC17	active, inferred	mid-ocean ridge	SEIR	-50.3000	133.8000	2780	2015 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
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
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
GEISEIR site 26, segment M4	active, inferred	mid-ocean ridge	SEIR	-43.6901	92.8451	2500	2009 plume only
Gakkel Ridge, Site 2	active, inferred	mid-ocean ridge	Gakkel Ridge	83.8500	-2.0000	3900	2001 plume only
GEISEIR site 11, segment K4	active, inferred	mid-ocean ridge	SEIR	-42.5375	82.8266	2600	2010 plume only
Gorda Ridge, EP96B	active, inferred	mid-ocean ridge	Gorda Ridge	42.5500	-126.8333	3400	1984 deposits only; 1996 plume only
SWIR, D50B	active, inferred	mid-ocean ridge	SWIR	-52.4200	12.7480	3913	2000-2001 plume and dredge only
MAR, 30.8 S	active, inferred	mid-ocean ridge	S MAR	-30.8327	-13.4690	2950	2013 plume only
Walsh	active, inferred	mid-ocean ridge	Mid-Cayman Rise	17.8333	-81.8333	4000	2009 plume only; 2013 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, 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]
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
MAR, 33 S	active, inferred	mid-ocean ridge	S MAR	-32.9676	-14.4517	2600	2013 plume only
EPR, mid 17 N segment	active, inferred	mid-ocean ridge	N EPR	17.0000	-105.3800	2750	1997 plume only
Chile Triple Junction	active, inferred	mid-ocean ridge	Chile Rise	-46.3000	-75.8000	3000	2010 plume only
Tevnia	active, inferred	mid-ocean ridge	N EPR	10.3333	-103.5533	2925	1994 submersible Alvin did not confirm activity
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, 28.3 S, Segment W3	active, inferred	mid-ocean ridge	S EPR	-28.3000	-112.9830	2220	1998 plume only
GEISEIR site 37, segment O4	active, inferred	mid-ocean ridge	SEIR	-47.7483	98.1756	2800	2009 plume only
EPR, 15 24'S	active, inferred	mid-ocean ridge	S EPR	-15.4000	-112.8350	2640	1993 plume only
Knipovich Ridge, 77 40'N	active, inferred	mid-ocean ridge	Knipovich Ridge	77.6300	7.5800	3000	2000 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
GEISEIR site 15, segment L1	active, inferred	mid-ocean ridge	SEIR	-41.2230	86.3892	2500	2010 plume only
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
SWIR, Plume 1, Segment 17	active, inferred	mid-ocean ridge	SWIR	-31.1830	58.5000	3600	1997 plume only
SEIR-WXC27	active, inferred	mid-ocean ridge	SEIR	-50.4000	134.3000	2760	2015 plume only
Galapagos Rift, 94.4 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.5300	-94.3300	2400	2005 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
MAR, 30 S	active, inferred	mid-ocean ridge	S MAR	-29.9505	-13.8545	3379	2013 plume only
S-OH2	active, inferred	mid-ocean ridge	N MAR	34.0670	-37.4830	3250	2000 or earlier plume only
GEISEIR site 27, segment M5	active, inferred	mid-ocean ridge	SEIR	-43.9805	93.4571	2700	2009 plume only
Gakkel Ridge, Site 3	active, inferred	mid-ocean ridge	Gakkel Ridge	84.4333	2.1333	4300	2001 plume only
GEISEIR site 12, segment K4	active, inferred	mid-ocean ridge	SEIR	-42.6600	83.0366	2600	2010 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
SWIR, D54	active, inferred	mid-ocean ridge	SWIR	-52.4370	13.3120	4029	2000-2001 plume and dredge only
MAR, 31 S	active, inferred	mid-ocean ridge	S MAR	-31.7377	-13.3772	3050	2013 plume only
Wagner Basin	active, inferred	mid-ocean ridge	Gulf of California	31.0666	-114.0833	120	2007 echosounder and grab samples
EPR, southern 16 N segment	active, inferred	mid-ocean ridge	N EPR	15.5000	-105.4000	2300	1997 plume only
GEISEIR site 38, segment O4	active, inferred	mid-ocean ridge	SEIR	-48.0048	98.8232	2800	2009 plume only
EPR, northern 17 N segment	active, inferred	mid-ocean ridge	N EPR	17.6700	-105.0050	2800	1997 plume only
Red Sea Rift, 18 N	active, inferred	mid-ocean ridge	Red Sea	17.9667	40.0667	1500	1980 submersible Pisces XI (deposits only)
EPR, 28.4 S, Segment W4	active, inferred	mid-ocean ridge	S EPR	-28.4170	-112.9640	2350	1998 plume only
Stockwork	active, inferred	mid-ocean ridge	JdF Ridge	47.9000	-129.1240	2300	2005 submersible Alvin (need publication to determine if confirmed)
EPR, 16 08'S	active, inferred	mid-ocean ridge	S EPR	-16.1300	-113.0000	2640	1993 plume only
Lucky B	active, inferred	mid-ocean ridge	Lena Trough	81.3610	-3.4400	4000	1999 dredging only
CIR, 8-17 S, Segment 5, 12.6 S	active, inferred	mid-ocean ridge	CIR	-12.6000	66.1000	3800	2010 plume only
Vityaz megamullion	active, inferred	mid-ocean ridge	CIR	-5.4000	68.5833	3500	1979 plume and deposits only
AMAR	active, inferred	mid-ocean ridge	N MAR	36.3833	-33.6500	2600	1992 plume only; 1994 plume only
GEISEIR site 16, segment L3	active, inferred	mid-ocean ridge	SEIR	-41.5883	87.2615	2500	2010 plume only
Pacific-Antarctic Ridge, 60 S segment	active, inferred	mid-ocean ridge	Pacific-Antarctic Ridge	-60.0000	-152.0000	2300	2009 plume only
Magic Mountain, 3-km south	active, inferred	mid-ocean ridge	Explorer Ridge	49.7250	-130.2667	1850	2002 AUV ABE plume only
SWIR, Plume 2, Segment 16	active, inferred	mid-ocean ridge	SWIR	-31.0670	58.9670	4200	1997 plume only
SEIR-WXC15	active, inferred	mid-ocean ridge	SEIR	-50.2500	135.3000	3000	2015 plume only
Galapagos Rift, 94.7 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.6000	-94.7750	2690	2005 plume only
MAR, 43 N	active, inferred	mid-ocean ridge	N MAR	43.0000	-29.0000	3400	1986 or earlier plume only
MAR, 28 S	active, inferred	mid-ocean ridge	S MAR	-27.7936	-13.3730	3217	2013 plume only
GEISEIR site 28, segment M6	active, inferred	mid-ocean ridge	SEIR	-44.7237	94.6039	2700	2009 plume only
Gakkel Ridge, Site 5	active, inferred	mid-ocean ridge	Gakkel Ridge	86.3500	37.0000	3600	2001 plume only
GEISEIR site 13, segment L1	active, inferred	mid-ocean ridge	SEIR	-41.0125	86.0608	2800	2010 plume only
SWIR, D9B	active, inferred	mid-ocean ridge	SWIR	-52.7070	18.8170	3931	2000-2001 plume and dredge only
Consag Basin	active, inferred	mid-ocean ridge	Gulf of California	30.6333	-113.9083	140	2007 echosounder and grab samples
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
CIR, 8-17 S, Segment 1	active, inferred	mid-ocean ridge	CIR	-8.2500	68.2000	3600	2010 plume only
EPR, southern 17 N segment	active, inferred	mid-ocean ridge	N EPR	16.5800	-105.3000	2700	1997 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)
Suakin Deep	active, inferred	mid-ocean ridge	Red Sea	19.6333	38.7333	2850	1972 deposits only
EPR, 28.7 S, Segment W4	active, inferred	mid-ocean ridge	S EPR	-28.7000	-112.9880	2350	1998 plume only
AAR KR1, Mujin	active, inferred	mid-ocean ridge	SEIR	-62.1000	158.8000	2100	2011 plume and biological samples
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
CIR, 8-17 S, Segment 6, 14.3 S	active, inferred	mid-ocean ridge	CIR	-14.3000	66.1000	3500	2010 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
North FAMOUS	active, inferred	mid-ocean ridge	N MAR	36.9670	-32.9670	2500	1994 plume only
GEISEIR site 17, segment L3	active, inferred	mid-ocean ridge	SEIR	-41.6498	87.3481	2500	2010 plume only
Pacific-Antarctic Ridge, 64 S segment	active, inferred	mid-ocean ridge	Pacific-Antarctic Ridge	-64.5000	-170.0000	2300	2009 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)
SWIR, unnamed, Segment 26	active, inferred	mid-ocean ridge	SWIR	-37.6080	50.8527	2800	2008 dredge only DY115-20 Leg 6
SEIR-WXC12	active, inferred	mid-ocean ridge	SEIR	-50.2500	136.2500	2780	2015 plume only
Boomerang Seamount	active, inferred	mid-ocean ridge	SEIR	-37.7217	77.8250	850	1996 plume and wax core only
EPR, 17 47'S	active, inferred	mid-ocean ridge	S EPR	-17.7900	-113.3000	2600	1993 plume only
Reykjanes Ridge, Area A	active, inferred	mid-ocean ridge	Reykjanes Ridge	62.4500	-25.4330	500	NotProvided
MAR, 27 S	active, inferred	mid-ocean ridge	S MAR	-27.1476	-13.4753	3341	2013 plume only
GEISEIR site 29, segment M6	active, inferred	mid-ocean ridge	SEIR	-44.9054	94.9673	2700	2009 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
GEISEIR site 14, segment L1	active, inferred	mid-ocean ridge	SEIR	-41.0716	86.1550	2700	2010 plume only
Mohns Ridge, 72.8 N	active, inferred	mid-ocean ridge	Mohns Ridge	72.8060	4.1650	2300	2013 plume only
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)
W Los Huellos Caldera	active, inferred	mid-ocean ridge	Galapagos Rift	1.0000	-90.6000	1600	2005 plume only
MAR, 11 26'N	active, inferred	mid-ocean ridge	N MAR	11.4482	-43.7035	3835	2009 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)
CIR, 8-17 S, Segment 6, 14.75 S	active, inferred	mid-ocean ridge	CIR	-14.7500	66.5000	3400	2010 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
EPR, 29.5 S, Segment E1	active, inferred	mid-ocean ridge	S EPR	-29.5000	-111.7200	2580	1998 plume only
AAR KR2	active, inferred	mid-ocean ridge	SEIR	-60.0000	152.5000	3200	2011 plume only
Logatchev-3	active, inferred	mid-ocean ridge	N MAR	14.7083	-44.9667	3100	1993-1999 (between these dates)
EPR, 16 24'S	active, inferred	mid-ocean ridge	S EPR	-16.4000	-113.0500	2640	1993 plume only
CIR, 8-17 S, Segment 7	active, inferred	mid-ocean ridge	CIR	-17.0000	66.8000	3100	2010 plume only
SWIR, Plume 6	active, inferred	mid-ocean ridge	SWIR	-27.7670	65.1330	3200	1997 plume only
S AMAR 1	active, inferred	mid-ocean ridge	N MAR	36.0830	-34.0830	2630	1992 plume only; 1994 plume only
GEISEIR site 18, segment L3	active, inferred	mid-ocean ridge	SEIR	-41.7133	87.4375	2500	2010 plume only
SWIR, D57	active, inferred	mid-ocean ridge	SWIR	-52.2240	13.7380	3517	2000-2001 plume and dredge only
SEIR-WXC02	active, inferred	mid-ocean ridge	SEIR	-50.2500	137.0000	2620	2015 plume only
GEISEIR site 1, segment J2	active, inferred	mid-ocean ridge	SEIR	-39.4400	78.0920	2270	1996 plume only
EPR, 20 S	active, inferred	mid-ocean ridge	S EPR	-20.0333	-113.6843	3000	1999 submersible Alvin did not confirm activity
EPR, 17 53'S	active, inferred	mid-ocean ridge	S EPR	-17.8800	-113.3000	2610	1993 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
MAR, 23 S	active, inferred	mid-ocean ridge	S MAR	-23.7428	-13.3936	2880	2013 plume only
MAR, 27 N	active, inferred	mid-ocean ridge	N MAR	27.0000	-44.5000	2900	1993 plume only
GEISEIR site 30, segment O1	active, inferred	mid-ocean ridge	SEIR	-46.6240	96.0594	2500	2009 plume only
SESCA	active, inferred	mid-ocean ridge	Gorda Ridge	40.7500	-127.5200	3300	1986 sediments and heat-flow measurements
near Jade Emperor Mountain, on-axis	active, inferred	mid-ocean ridge	SWIR	-37.8666	49.2166	3000	2010 plume only
MAR, 7 57'S	active, inferred	mid-ocean ridge	S MAR	-7.9500	-13.4420	2600	2001 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)
MAR, 11 N	active, inferred	mid-ocean ridge	N MAR	11.0380	-43.6483	4010	1984 plume only; 2009 plume only
Aden New Century Mountains	active, inferred	mid-ocean ridge	Aden Ridge	12.0833	45.6667	800	2000-2001 plume only
EPR, 29.8 S, Segment E1	active, inferred	mid-ocean ridge	S EPR	-29.8000	-111.7300	2580	1998 plume only
MAR, 4 02'S	active, inferred	mid-ocean ridge	S MAR	-4.0333	-12.2500	4000	2005 plume only
Galapagos Rift, 93.7 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.4970	-93.7700	2220	2005 plume only
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
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
Chile Rise, Segment N8	active, inferred	mid-ocean ridge	Chile Rise	-38.7167	-91.5667	3330	1998 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
Gorda Ridge, GR-15	active, inferred	mid-ocean ridge	Gorda Ridge	42.9500	-126.5500	3365	1985 plume only
SWIR, D62	active, inferred	mid-ocean ridge	SWIR	-52.2530	15.1030	3990	2000-2001 plume and dredge only
SEIR-WXC07	active, inferred	mid-ocean ridge	SEIR	-50.2500	138.3000	2420	2015 plume only
GEISEIR site 3, segment J4	active, inferred	mid-ocean ridge	SEIR	-41.7720	79.7530	2800	1996 plume only
EPR, 17 56'S	active, inferred	mid-ocean ridge	S EPR	-17.9400	-113.3170	2620	1993 plume only
South Kurchatov	active, inferred	mid-ocean ridge	N MAR	40.4670	-29.5500	2900	1992 plume only; 1995 plume only
MAR, 19 S	active, inferred	mid-ocean ridge	S MAR	-19.3301	-11.9421	2707	2013 plume only
MAR, 30 N	active, inferred	mid-ocean ridge	N MAR	30.0333	-42.5000	3400	1993 plume only
GEISEIR site 31, segment O1	active, inferred	mid-ocean ridge	SEIR	-46.8956	96.5709	2600	2009 plume only
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)
MAR, 8 10'S	active, inferred	mid-ocean ridge	S MAR	-8.1670	-13.4670	2000	2001 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
Carlsberg Ridge, CR2003	active, inferred	mid-ocean ridge	Carlsberg Ridge	6.0500	60.9500	3500	2003 plume only; 2007 plume only
EPR, 30.1 S, Segment E1	active, inferred	mid-ocean ridge	S EPR	-30.1330	-111.7640	2480	1998 plume only
Carlsberg Ridge, 63 40'E	active, inferred	mid-ocean ridge	Carlsberg Ridge	3.7000	63.6666	3500	2007 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)
Landing Stage	active, inferred	mid-ocean ridge	SWIR	-37.5000	51.0000	2300	2014 leg 2 or 3 of the 30th Chinese Cruise
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)
Kolbeinsey Ridge, 69 N	active, inferred	mid-ocean ridge	Kolbeinsey Ridge	68.7581	-16.0000	1200	1980 or earlier sediments only
GEISEIR site 20, segment L3	active, inferred	mid-ocean ridge	SEIR	-41.9508	87.8008	2400	2010 plume only
Chile Rise, Segment N9A	active, inferred	mid-ocean ridge	Chile Rise	-39.0500	-91.5833	3450	1998 plume only
ET	active, inferred	mid-ocean ridge	JdF Ridge	48.1993	-128.9257	2500	NotProvided
SWIR, D82	active, inferred	mid-ocean ridge	SWIR	-52.2080	15.5830	4100	2000-2001 plume only
SEIR-WXC06	active, inferred	mid-ocean ridge	SEIR	-50.2500	138.5500	2400	2015 plume only
GEISEIR site 5, segment K1	active, inferred	mid-ocean ridge	SEIR	-41.2420	81.1580	2860	1996 plume only; 2007 plume only
EPR, 1 S	active, inferred	mid-ocean ridge	S EPR	-0.8000	-102.4600	2800	2005 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
Split Seamount	active, inferred	mid-ocean ridge	JdF Ridge	47.6400	-128.9667	2350	1990 camera tow (need reference to check if activity confirmed)
TaiJi	active, inferred	mid-ocean ridge	S MAR	-13.5900	-14.5200	3180	2011 plume only
Area JX	active, inferred	mid-ocean ridge	CIR	-22.9666	69.1833	3500	1986 plume only (camera tow did not confirm)
EPR, 7 S	active, inferred	mid-ocean ridge	S EPR	-7.0000	-107.5500	2600	1985/86 or 1989 TV grab
EPR, 30.4 S, Segment E2	active, inferred	mid-ocean ridge	S EPR	-30.3750	-111.7640	2320	1998 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
SWIR, Plume 3, Segment 16	active, inferred	mid-ocean ridge	SWIR	-30.8500	59.3830	3900	1997 plume only
GEISEIR site 2, segment J4	active, inferred	mid-ocean ridge	SEIR	-41.2520	79.1030	2800	1996 plume and dredge only
EPR, 21 20'S	active, inferred	mid-ocean ridge	S EPR	-21.3670	-114.2570	2900	1981 plume only; 1987-1988 deposits only
Eye of Mordor Seamount	active, inferred	mid-ocean ridge	Galapagos Rift	1.9410	-91.3100	1555	2005 plume only
GEISEIR site 21, segment L3	active, inferred	mid-ocean ridge	SEIR	-42.0050	87.8808	2400	2010 plume only
Gakkel Ridge, Site 6	active, inferred	mid-ocean ridge	Gakkel Ridge	86.5333	43.0000	3000	2001 plume only
GEISEIR site 4, segment K1	active, inferred	mid-ocean ridge	SEIR	-41.2025	81.0625	2800	2010 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
MAR, segment south of St. Paul system	active, inferred	mid-ocean ridge	N MAR	0.5000	-25.0000	3500	2013 plume only
GEISEIR site 33, segment O2	active, inferred	mid-ocean ridge	SEIR	-47.2383	97.1566	2700	2009 plume only
EPR/Tamayo intersection	active, inferred	mid-ocean ridge	N EPR	22.9333	-108.0667	3200	1979 submersible Alvin did not confirm activity
Rainbow Bay	active, inferred	mid-ocean ridge	S MAR	-14.0300	-14.3400	2900	2009 towed video did not confirm activity
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
Kebrit Deep	active, inferred	mid-ocean ridge	Red Sea	24.7233	36.2767	1590	1972 deposits only
SWIR, Plume 5	active, inferred	mid-ocean ridge	SWIR	-27.9170	64.4500	4000	1997 plume only
Pobeda-1	active, inferred	mid-ocean ridge	N MAR	17.1500	-46.4200	3100	2014/2015 video profiling, TVgrab and corer
CIR, 8-17 S, Segment 2	active, inferred	mid-ocean ridge	CIR	-9.9000	66.7500	4000	2010 plume only
EPR, 8 53'N	active, inferred	mid-ocean ridge	N EPR	8.9000	-104.2000	2580	1991 plume only
EPR, 30.8 S, Segment E2	active, inferred	mid-ocean ridge	S EPR	-30.7500	-111.8770	2360	1998 plume only
GEISEIR site 7, segment K3	active, inferred	mid-ocean ridge	SEIR	-41.8020	81.8380	2540	1996 plume only; 2010 plume only
EPR, 17 S	active, inferred	mid-ocean ridge	S EPR	-17.0000	-113.1170	2680	1993 plume only
Mohns Ridge, 72 N	active, inferred	mid-ocean ridge	Mohns Ridge	72.0390	-0.2520	2500	1987 plume only; 2013 plume only
N Oceanographer	active, inferred	mid-ocean ridge	N MAR	35.2830	-34.8670	2600	1992 plume only
GEISEIR site 23, segment M2	active, inferred	mid-ocean ridge	SEIR	-42.0272	89.2205	2400	2009 plume only
Gakkel Ridge, Site 7	active, inferred	mid-ocean ridge	Gakkel Ridge	86.9833	55.5000	3800	2001 plume only
GEISEIR site 6, segment K2	active, inferred	mid-ocean ridge	SEIR	-41.6600	81.6617	2600	2007 plume only; 2010 plume only
Shaban Deep	active, inferred	mid-ocean ridge	Red Sea	26.2250	35.3500	1540	1983 deposits only
EPR, 27.7 S, Segment W3	active, inferred	mid-ocean ridge	S EPR	-27.7000	-112.9170	2105	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
Su Causeway	active, inferred	mid-ocean ridge	SWIR	-38.1000	48.6000	3000	2014 leg 2 or 3 of the 30th Chinese Cruise
GEISEIR site 34, segment O3	active, inferred	mid-ocean ridge	SEIR	-47.4145	97.4373	2700	2009 plume only
EPR, 31.4 S, Segment E4	active, inferred	mid-ocean ridge	S EPR	-31.4330	-111.9670	2350	1998 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
SEIR-WXC25	active, inferred	mid-ocean ridge	SEIR	-50.2500	131.9000	3050	2015 plume only
EPR, 14 18'S	active, inferred	mid-ocean ridge	S EPR	-14.3000	-112.6670	2630	1993 plume only
CIR, 8-17 S, Segment 3	active, inferred	mid-ocean ridge	CIR	-10.6600	66.5000	3500	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
W Eye of Mordor	inactive	mid-ocean ridge	Galapagos Rift	1.9707	-91.3900	1600	2005 towed video Medea observed inactive chimneys
MAR, 24 20'N	inactive	mid-ocean ridge	N MAR	24.3500	-46.2000	3200	NotProvided
Brown Bear Seamount	inactive	mid-ocean ridge	JdF Ridge	46.0333	-130.5500	1500	NotProvided
Gorda Ridge, 41 30'N	inactive	mid-ocean ridge	Gorda Ridge	41.5167	-127.4500	3350	1984 deposits only
MAR, 24 30'N	inactive	mid-ocean ridge	N MAR	24.5000	-46.1533	3900	1987 deposits only
Hess Deep	inactive	mid-ocean ridge	Galapagos Rift	2.2500	-101.5000	5100	NotProvided
Galapagos Rift, 85 50'W	inactive	mid-ocean ridge	Galapagos Rift	0.7500	-85.8333	2600	1988 or earlier submersible observations
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
EPR 87D1 Seamount	inactive	mid-ocean ridge	N EPR	11.5333	-103.8600	2090	NotProvided
Ashadze-3	inactive	mid-ocean ridge	N MAR	12.9860	-44.8610	4200	2005 plume and dredge only
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)
MESO Zone	inactive	mid-ocean ridge	CIR	-23.3927	69.2422	2850	1993 TV grab and water column measurements
Galapagos Rift, 95 W	inactive	mid-ocean ridge	Galapagos Rift	2.5000	-95.1667	2600	NotProvided
Logatchev-5	inactive	mid-ocean ridge	N MAR	14.7500	-44.9700	3100	2007 ROV VICTOR 6000 did not find hydrothermal activity
MAR, 25 50'N	inactive	mid-ocean ridge	N MAR	25.8083	-44.9833	3000	NotProvided
SEIR	inactive	mid-ocean ridge	SEIR	-28.0614	74.1733	5000	NotProvided
Jade Emperor Mountain	inactive	mid-ocean ridge	SWIR	-37.9400	49.2600	1500	2010 video sled, plume survey, and geological sampling all suggest inactive
Dellwood Seamount	inactive	mid-ocean ridge	Explorer Ridge	50.7470	-130.8961	800	1974 or earlier deposits only; 2018 ROV Hercules inactive
Mount Jourdanne	inactive	mid-ocean ridge	SWIR	-27.8500	63.9333	2940	1998 submersible Shinkai 6500
Explorer Deep	inactive	mid-ocean ridge	Explorer Ridge	50.1000	-129.7500	3200	1969, deposits only
MAR, 12 48'N	inactive	mid-ocean ridge	N MAR	12.8000	-44.7883	2400	NotProvided
Guaymas Basin, Northern Trough	inactive	mid-ocean ridge	Gulf of California	27.3050	-111.5067	2000	1977 submersible Seacliff (hydrothermal deposits only)
DSDP Hole 504B	inactive	mid-ocean ridge	Galapagos Rift	1.2267	-83.7300	3500	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
EPR, 14 N seamount	inactive	mid-ocean ridge	N EPR	14.1500	-104.3667	2600	NotProvided
Owen transform fault	inactive	mid-ocean ridge	Carlsberg Ridge	9.8333	57.9500	4500	NotProvided
Ashadze-4	inactive	mid-ocean ridge	N MAR	12.9700	-44.8500	4530	2007 ROV VICTOR 6000 did not find hydrothermal activity
Squid Forest	inactive	mid-ocean ridge	Kolbeinsey Ridge	68.0000	-17.5000	900	1999 ROV Aglantha
Romanche Fracture Zone	inactive	mid-ocean ridge	S MAR	-0.9767	-24.5133	3100	NotProvided
MAR, 22 30'N	inactive	mid-ocean ridge	N MAR	22.5000	-45.0050	2800	NotProvided
MAR, 15 50'N	inactive	mid-ocean ridge	N MAR	15.8667	-46.6667	3000	NotProvided
Carlsberg Ridge, 1.67 S	inactive	mid-ocean ridge	Carlsberg Ridge	-1.6768	67.7700	4500	NotProvided
E Eye of Mordor	inactive	mid-ocean ridge	Galapagos Rift	1.9058	-91.2310	1600	2005 towed video Medea found inactive chimneys
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]
MAR, 23 35'N	inactive	mid-ocean ridge	N MAR	23.5833	-45.0000	3500	1980 submersible Alvin did not observe hydrothermal activity
Green Seamount	inactive	mid-ocean ridge	N EPR	20.8033	-109.2833	2000	1982 submersible Alvin observed only inactive
Petersburgskoe	inactive	mid-ocean ridge	N MAR	19.8666	-45.8666	3100	2010 dredging only
MAR, 16 46'N	inactive	mid-ocean ridge	N MAR	16.7950	-46.3800	3300	NotProvided

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