N. Pacific

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

Vent Field Name ID	Activity	Tectonic Setting	Region	Latitude	Longitude	Maximum or Single Reported Depth	Year and How Discovered
Banua Wuhu submarine volcano	active, confirmed	arc volcano	Sangihe Arc	3.1380	125.4910	10	1996 or earlier, likely by SCUBA
Alarcon Rise, Ja Sit	active, confirmed	mid-ocean ridge	Gulf of California	23.3765	-108.5315	2304	2012 ROV Doc Ricketts
Natsushima 84-1 Knoll	active, confirmed	back-arc spreading center	Okinawa Trough	27.5750	127.1417	1600	1986 submersible Shinkai 2000
AHA Field	active, confirmed	mid-ocean ridge	N EPR	1.7333	-102.2830	2850	2000 towed imaging ARGO-II
Main Endeavour Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9487	-129.0981	2220	1984 submersible Alvin; 1982 dredge only
Ruby	active, confirmed	arc volcano	Mariana Arc	15.6200	145.5700	214	2006 ROV Jason II; 2003 plume only
Sumisu Caldera	active, confirmed	arc volcano	Izu-Bonin Arc	31.4667	140.0667	690	1998 submersible Shinkai 2000
Axial Seamount, CASM	active, confirmed	mid-ocean ridge	JdF Ridge	45.9892	-130.0272	1580	1983 submersible Pisces IV
Bahia Concepcion	active, confirmed	other	Coastal Baja California	26.6667	-111.8333	15	1968 or earlier, likely by SCUBA
Yokosuka	active, confirmed	back-arc spreading center	Okinawa Trough	25.2638	124.3733	2190	2016 ROV Kaiko; 2014 plume only
Mariana Trough, Central Trough	active, confirmed	back-arc spreading center	Mariana Trough	18.0467	144.7533	3676	1987 submersible Alvin
Kasuga 2 Seamount	active, confirmed	arc volcano	Mariana Arc	21.6000	143.6167	500	1987 submersible Alvin
EPR, 10 02'N	active, confirmed	mid-ocean ridge	N EPR	10.0330	-104.3300	2560	1992 submersible Alvin
Piip Submarine Volcano	active, confirmed	arc volcano	Aleutian Arc, western	55.4167	167.2717	500	1990 Mir submersible; 1981 R/V "Vulcanolog" cruise; 1987 (or 1986) echo-sounder fluid discharge
NESCA	active, confirmed	mid-ocean ridge	Gorda Ridge	41.0000	-127.4917	3300	1988 submersible Alvin; 1986 dredge and photographs did not confirm activity
Loihi Seamount	active, confirmed	intra-plate volcano	Central Pacific	18.9500	-155.2500	4800	1985 bottom photography R/V Hakuho Maru; 1987 submersible Alvin
Alarcon Rise, Meyibo	active, confirmed	mid-ocean ridge	Gulf of California	23.3553	-108.5443	2295	2012 ROV Doc Ricketts
Irabu Knoll	active, confirmed	back-arc spreading center	Okinawa Trough	25.2300	124.8800	1850	2000 submersible Shinkai 6500; 1986 seafloor photos did not confirm activity
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)
High-Rise Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9666	-129.0894	2200	1988 submersible Alvin
East Diamante volcano	active, confirmed	arc volcano	Mariana Arc	15.9300	145.6700	457	2004 ROV ROPOS; 2003 plume only
Suiyo Seamount	active, confirmed	arc volcano	Izu-Bonin Arc	28.5750	140.6417	1380	1991 submersible Shinkai 2000
Higashi-Ensei	active, confirmed	back-arc spreading center	Okinawa Trough	28.4393	128.1724	1220	2016 ROV Kaiko dives 723 and 724
Alice Springs Field	active, confirmed	back-arc spreading center	Mariana Trough	18.2103	144.7073	3640	1987 submersible Alvin; 1982 plume only
Northwest Eifuku	active, confirmed	arc volcano	Mariana Arc	21.4850	144.0430	1604	2004 ROV ROPOS; 2003 plume only
Central Cleft, off-axis	active, confirmed	mid-ocean ridge	JdF Ridge	44.7583	-130.2750	2200	2000 ROV Tiburon
EPR, 9 33'N	active, confirmed	mid-ocean ridge	N EPR	9.5583	-104.2500	2574	1989 Argo I towed video; 1991 submersible Alvin
Kagamil Island	active, confirmed	arc volcano	Aleutian Arc, western	52.9800	-169.7200	5	2007 SCUBA
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
Alarcon Rise, Tzab-ek	active, confirmed	mid-ocean ridge	Gulf of California	23.3526	-108.5597	2249	2015 ROV Doc Ricketts
Izena Cauldron	active, confirmed	back-arc spreading center	Okinawa Trough	27.2667	127.0833	1610	1988 submersible Shinkai 2000
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
Mothra Field	active, confirmed	mid-ocean ridge	JdF Ridge	47.9233	-129.1082	2270	1996 ROV ROPOS; 1986 plume only
West Rota volcano	active, confirmed	arc volcano	Mariana Arc	14.3250	144.8330	1150	2005 ROV Hyper-Dolphin; 2003 plume only; 2004 ROV ROPOS did not observe venting
Kaikata Seamount	active, confirmed	arc volcano	Izu-Bonin Arc	26.7000	141.0833	930	1988 submersible Shinkai 2000; 1985 dredge only
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
Futagoyama	active, confirmed	back-arc spreading center	Okinawa Trough	24.8674	123.3081	1270	2016 ROV Kaiko dive 717
Axial Seamount, International District	active, confirmed	mid-ocean ridge	JdF Ridge	45.9266	-129.9795	1544	1986 submersible Pisces IV
Pika	active, confirmed	back-arc spreading center	Mariana Trough	12.9183	143.6483	2990	2003 submersible Shinkai 6500; 2003 plume only
Daikoku volcano	active, confirmed	arc volcano	Mariana Arc	21.3240	144.1940	450	2004 ROV ROPOS; 2003 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
Floc	active, confirmed	mid-ocean ridge	JdF Ridge	46.3133	-129.7050	2290	1993 DEEPTOW and submersible Alvin
White Point, Palos Verde, California	active, confirmed	other	Coastal California	33.7000	-118.3167	10	1984 or earlier, likely by SCUBA
Sakai	active, confirmed	back-arc spreading center	Okinawa Trough	27.5481	126.9895	1600	1988 submersible Shinkai 2000; 1987 plume only
Pegasus	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7500	-88.2000	2000	2011 ROV Little Hercules
Esmeralda Bank	active, confirmed	arc volcano	Mariana Arc	14.9667	145.2500	323	1990 towed video and TV-grab; 1978 hydrothermal deposits only
Galapagos Mounds	active, confirmed	mid-ocean ridge	Galapagos Rift	1.4500	-86.1665	2700	1977 submersible Alvin
Taketomi Thermal Area	active, confirmed	arc volcano	Ryukyu Arc	24.3483	124.1017	23	1987 or earlier, likely by SCUBA
Daisan-Kume Knoll	active, confirmed	arc volcano	Ryukyu Arc	26.3020	126.4125	1370	2015 ROV Kaiko; 2014 ROV Hyper Dolphin 3000 Dive 1761 may have confirmed; 2014 AUV temperature anomaly
Precious Stone Mountain	active, confirmed	mid-ocean ridge	Galapagos Rift	1.2200	-101.4900	1700	2009 deep-tow video and TV grab
EPR, 9 47'N	active, confirmed	mid-ocean ridge	N EPR	9.7750	-104.2802	2560	1989 Argo I towed video; 1991 submersible Alvin
Source	active, confirmed	mid-ocean ridge	JdF Ridge	46.1550	-129.8100	2055	1993 submersible Alvin
Punta Banda	active, confirmed	other	Coastal Baja California	31.7500	-116.7500	30	1960's commercial abalone divers
Ringvent	active, confirmed	mid-ocean ridge	Gulf of California	27.5083	-111.6792	1740	2016 submersible Alvin; 2009 towed camera/CTD/bottles
Kueishan Island, offshore	active, confirmed	back-arc spreading center	Okinawa Trough	24.8333	122.0000	1200	2008 or earlier
Jaco Scar	active, confirmed	arc volcano	Costa Rica fore arc	9.1175	-84.8397	1790	2009 submersible Alvin
Punta Mita, Bahia de Banderas	active, confirmed	other	Coastal Mexico	20.7700	-105.5200	10	1997 photo/video most likely by SCUBA
Uka Pacha	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7700	-88.3000	2100	2011 ROV Little Hercules
Northwest Rota-1 volcano	active, confirmed	arc volcano	Mariana Arc	14.6010	144.7750	599	2004 ROV ROPOS; 2003 plume only
Yoron Hole	active, confirmed	back-arc spreading center	Okinawa Trough	27.4916	127.5333	590	2010 ROV Hyperdolphin
EPR, 9 50'N	active, confirmed	mid-ocean ridge	N EPR	9.8300	-104.2900	2520	1989 Argo I towed video
Hot Beach, Mendeleev Volcano	active, confirmed	arc volcano	Kuril Arc	43.9760	145.7360	1	1990 or earlier, from the beach
Higa	active, confirmed	back-arc spreading center	Okinawa Trough	26.5550	126.2233	1485	2015 ROV Kaiko
North Cleft, low temperature	active, confirmed	mid-ocean ridge	JdF Ridge	44.8833	-130.2667	2250	1987-1989 camera/CTD tows
Teotihuacan	active, confirmed	mid-ocean ridge	N EPR	15.7333	-105.4333	2300	2010 submersible Nautile; 1997 plume only
Tempus Fugit	active, confirmed	mid-ocean ridge	Galapagos Rift	0.7683	-85.9100	2560	2011 ROV Little Hercules
Minami-Hiyoshi submarine volcano	active, confirmed	arc volcano	Mariana Arc	23.4970	141.9400	80	2005 ROV HyperDolphin
Calyfield	active, confirmed	mid-ocean ridge	Galapagos Rift	0.8300	-89.6083	1660	2002 submersible Alvin
Omuro Hole	active, confirmed	arc volcano	Izu-Bonin Arc	34.5467	139.4417	200	2012 ROV Hyper-Dolphin
Forecast	active, confirmed	arc volcano	Mariana Arc	13.4000	143.9166	1470	1992 submersible Shinkai 6500
Tarama Knoll	active, confirmed	back-arc spreading center	Okinawa Trough	25.0916	124.5416	1990	2009 ROV HyperDolphin
Nagahama Bay, Iwo-dake Volcano	active, confirmed	arc volcano	Ryukyu Arc	30.7500	130.3330	26	1994 or earlier intertidal; 2008 or earlier SCUBA subtidal
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
Maug Caldera	active, confirmed	arc volcano	Mariana Arc	20.0200	145.2200	145	2003 SCUBA shallow vents; 2004 ROV ROPOS deeper vents; 2003 plume only deeper vents
SPOT, Hatoma Knoll	active, confirmed	back-arc spreading center	Okinawa Trough	24.8550	123.8410	1520	1999 submersible Shinkai 2000
Myojin Knoll	active, confirmed	arc volcano	Izu-Bonin Arc	32.1033	139.8683	1360	1996 submersible Shinkai 2000
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, 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
Nikko volcano	active, confirmed	arc volcano	Mariana Arc	23.0833	142.3333	600	1992 submersible Shinkai 6500; 1979 first observed discolored water above the seamount
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
Seamount X	active, confirmed	arc volcano	Mariana Arc	13.2500	144.0200	1450	1994 or earlier submersible Shinkai 6500
Chamorro volcano	active, confirmed	arc volcano	Mariana Arc	20.8100	144.7050	896	2016 ROV Deep Discoverer; 2003 plume only
Kagoshima Bay	active, confirmed	arc volcano	Ryukyu Arc	31.6583	130.8000	200	1993 towed TV system (Haorimushi site); 2007 ROV Hyper-dolphin (Tagiri site)
EPR, 9 17'N	active, confirmed	mid-ocean ridge	N EPR	9.2800	-104.2166	2585	1989 Argo I towed video
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
Kueishan Island	active, confirmed	back-arc spreading center	Okinawa Trough	24.8333	121.9500	30	1999, likely by SCUBA
Flow	active, confirmed	mid-ocean ridge	JdF Ridge	46.5250	-129.5783	2390	1993 ROV ROPOS
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, 21 N	active, confirmed	mid-ocean ridge	N EPR	20.8333	-109.0833	2600	1979 submersible Alvin; 1978 submersible Cyana discovered mineral deposits only
Mariana Mounds	active, confirmed	back-arc spreading center	Mariana Trough	18.0333	144.2833	3600	1987 submersible Alvin
Kawio Barat	active, confirmed	arc volcano	Sangihe Arc	4.8133	125.0816	1890	2003 towed video, CTD/transmissometer, and dredge
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)
Guaymas Basin, Northern Trough_2	active, confirmed	mid-ocean ridge	Gulf of California	27.4110	-111.3879	1800	2015 ROV Hybis
EPR, 9 30'N	active, confirmed	mid-ocean ridge	N EPR	9.5167	-104.2414	2580	1989 Argo I towed video
Middle Valley, Dead Dog Vent Field	active, confirmed	mid-ocean ridge	JdF Ridge	48.4560	-128.7088	2450	1990 HOV Alvin
Mariana Trough, 15.5 N	active, confirmed	back-arc spreading center	Mariana Trough	15.4080	144.5090	4196	2015 plume only, 2016 ROV did not confirm
East Blanco Depression	active, confirmed	mid-ocean ridge	JdF Ridge	44.2170	-129.6250	3460	1994 ROV U.S. Navy's Advanced Tethered Vehicle
SPOT, Yonaguni Knoll IV	active, confirmed	back-arc spreading center	Okinawa Trough	24.8490	122.7000	1385	2000 submersibles Shinkai 2000 and Shinkai 6500
Mokuyo Seamount	active, confirmed	arc volcano	Izu-Bonin Arc	28.3200	140.5800	1200	1990 submersible Shinkai 2000
Navidad	active, confirmed	mid-ocean ridge	Galapagos Rift	2.5300	-94.0750	2380	2005 towed video Medea
Snail	active, confirmed	back-arc spreading center	Mariana Trough	12.9533	143.6200	2880	2003 ROV Jason II; 2003 plume only
Kasuga 3 Seamount	active, confirmed	arc volcano	Mariana Arc	21.3833	143.6000	1140	1987 submersible Alvin
Rose Garden	active, confirmed	mid-ocean ridge	Galapagos Rift	0.8058	-86.2267	2550	1977 submersible Alvin; 1976 plume and photographs of clam shells did not confirm activity (note: Rose Garden is used here as the name of the vent field, but Rose Garden vent site itself not discovered until 1979)
Pulau Weh	active, confirmed	arc volcano	Banda/Sunda Arc	5.8166	95.3000	8	1982 or earlier, likely by SCUBA
Feather Duster	active, confirmed	mid-ocean ridge	N EPR	10.9267	-103.6767	2520	1984 towed camera and submersible Alvin
Hafa Adai	active, confirmed	back-arc spreading center	Mariana Trough	16.9570	144.8680	3294	2016 ROV Deep Discoverer; 2015 AUV Sentry plume mapping
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
Minami-Ensei Knoll	active, confirmed	back-arc spreading center	Okinawa Trough	28.3917	127.6417	740	1988 deep tow TV surveys followed by submersible Shinkai 2000; 1986 dredged Calyptogena shells
Medusa	active, confirmed	mid-ocean ridge	N EPR	9.1404	-104.2065	2580	2007 ROV Jason II; 1991 plume only
Middle Valley, Bent Hill Massive Sulfide	active, confirmed	mid-ocean ridge	JdF Ridge	48.4341	-128.6812	2440	1990 HOV Alvin, 1985 deposits only
Doyo Seamount	active, confirmed	arc volcano	Izu-Bonin Arc	27.6833	140.8167	520	1990 submersible Shinkai 2000
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
TOTO Caldera	active, confirmed	arc volcano	Mariana Arc	12.7167	143.5333	2960	2000 deep-tow camera (later, same year - ROV Kaiko); 1998 or earlier hydrothermal deposits dredged; 1998 plume only
Akuseki-jima	active, confirmed	arc volcano	Ryukyu Arc	29.4610	129.5970	5	1993 or earlier, likely by SCUBA
Kraternaya Bight, Ushishir Volcano	active, confirmed	arc volcano	Kuril Arc	47.5167	152.8000	60	1985 SCUBA
Perseverance	active, confirmed	back-arc spreading center	Mariana Trough	15.4802	144.5077	3935	2016 ROV SuBastian; 2015 AUV Sentry plume mapping
Lembeh Strait	active, confirmed	arc volcano	Sangihe Arc	1.8000	125.2000	3	NotProvided
North Knoll, Iheya Ridge	active, confirmed	back-arc spreading center	Okinawa Trough	27.7908	126.8966	1100	1995 deep tow survey
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
Baby Bare Seamount	active, confirmed	mid-ocean ridge	JdF Ridge	47.7100	-127.7870	2600	1995 submersible Alvin
Iguanas-Pinguinos	active, confirmed	mid-ocean ridge	Galapagos Rift	2.1000	-91.9350	1640	2005 towed video Medea
Axial Seamount, ASHES	active, confirmed	mid-ocean ridge	JdF Ridge	45.9333	-130.0140	1540	1984 submersible Alvin
Red Seamount	active, confirmed	mid-ocean ridge	N EPR	20.8033	-109.3783	2000	1982 submersible Alvin
Dorado Outcrop	active, confirmed	other		9.0800	-87.0950	3000	2013 ROV Jason Dive J2-751
13 N Ridge Site	active, confirmed	back-arc spreading center	Mariana Trough	13.0987	143.6886	3036	2000 deep-tow camera (later, same year - ROV Kaiko)
Kodakara-jima	active, confirmed	arc volcano	Ryukyu Arc	29.2166	129.3333	10	1993 or earlier, likely by SCUBA
EPR, 10 44.6'N	active, confirmed	mid-ocean ridge	N EPR	10.7433	-103.6500	2580	1985 Argo video tow with temperature
Magic Mountain	active, confirmed	mid-ocean ridge	Explorer Ridge	49.7500	-130.2667	1850	1984 submersible Pisces IV
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
Bayonnaise Knoll caldera	active, inferred	back-arc spreading center	Izu-Bonin back-arc	31.9667	139.7333	900	2003 temperature anomalies, but camera survey observed inactive vent deposits
Eye of Mordor Seamount	active, inferred	mid-ocean ridge	Galapagos Rift	1.9410	-91.3100	1555	2005 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)
Magic Mountain, 3-km south	active, inferred	mid-ocean ridge	Explorer Ridge	49.7250	-130.2667	1850	2002 AUV ABE 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)
EPR, Manzanillo Spreading Segment	active, inferred	mid-ocean ridge	N EPR	18.2500	-106.3000	2600	1997 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)
EPR, mid 17 N segment	active, inferred	mid-ocean ridge	N EPR	17.0000	-105.3800	2750	1997 plume only
Stockwork	active, inferred	mid-ocean ridge	JdF Ridge	47.9000	-129.1240	2300	2005 submersible Alvin (need publication to determine if confirmed)
Okinawa Trough, Site ES1	active, inferred	back-arc spreading center	Okinawa Trough	30.3303	129.0827	521	1992 dredge 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
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
EPR, 11 45'N, OSC	active, inferred	mid-ocean ridge	N EPR	11.7775	-103.8300	2580	1984 Angus camera (or 1985 Argo video) tow with temperature; 1988 submersible Alvin dive #2004 (need reference to confirm activity)
EPR, northern 17 N segment	active, inferred	mid-ocean ridge	N EPR	17.6700	-105.0050	2800	1997 plume only
W Syoyo	active, inferred	arc volcano	Mariana Arc	22.5080	142.5330	2150	2003 plume only
Gorda Ridge, GR-15	active, inferred	mid-ocean ridge	Gorda Ridge	42.9500	-126.5500	3365	1985 plume only
Mariana Trough, plume 2	active, inferred	back-arc spreading center	Mariana Trough	12.7610	143.4730	2950	2003 plume only
Makhahnas	active, inferred	arc volcano	Mariana Arc	20.5300	144.8833	420	2003 no plume detected
EPR, southern 17 N segment	active, inferred	mid-ocean ridge	N EPR	16.5800	-105.3000	2700	1997 plume only
SW Syoyo	active, inferred	arc volcano	Mariana Arc	22.3870	142.7620	1750	2003 plume only
ET	active, inferred	mid-ocean ridge	JdF Ridge	48.1993	-128.9257	2500	NotProvided
Ahyi	active, inferred	arc volcano	Mariana Arc	20.4200	145.0300	60	2003 plume only
Galapagos Rift, 94.4 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.5300	-94.3300	2400	2005 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)
SESCA	active, inferred	mid-ocean ridge	Gorda Ridge	40.7500	-127.5200	3300	1986 sediments and heat-flow measurements
Wagner Basin	active, inferred	mid-ocean ridge	Gulf of California	31.0666	-114.0833	120	2007 echosounder and grab samples
EPR, 11 07'N	active, inferred	mid-ocean ridge	N EPR	11.1330	-103.7800	2580	1988 submersible Alvin dive #1989 (need reference to confirm activity); 1991 plume only
EPR, 8 53'N	active, inferred	mid-ocean ridge	N EPR	8.9000	-104.2000	2580	1991 plume only
Tangyin	active, inferred	back-arc spreading center	Okinawa Trough	25.0667	122.5667	1206	2014 likely by dredging or ROV during the HOBAB3 cruise on R/V Kexue
Galapagos Rift, 94.7 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.6000	-94.7750	2690	2005 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
Consag Basin	active, inferred	mid-ocean ridge	Gulf of California	30.6333	-113.9083	140	2007 echosounder and grab samples
San Felipe	active, inferred	other	Coastal Baja California	31.0000	-114.8000	1	1982 or earlier, likely from shore
Daiichi-Amami knoll	active, inferred	arc volcano	Ryukyu Arc	28.4500	128.7500	350	2013 multibeam echo sounder on S/V Takuyo and AUV Gondo
Mariana Trough, 14.5 N	active, inferred	back-arc spreading center	Mariana Trough	14.4870	144.0940	4120	2015 plume only
Bataan	active, inferred	arc volcano	Luzon/Bicol Arc	20.0000	122.0000		2002 or earlier some indications of activity
Myojinsho Caldera	active, inferred	arc volcano	Izu-Bonin Arc	31.8833	139.9500	1110	1988 deposits only; 2005 plume only
Sumisu Rift	active, inferred	back-arc spreading center	Izu-Bonin back-arc	31.1000	139.8917	1600	1987 submersible Alvin inactive chimneys only
W Los Huellos Caldera	active, inferred	mid-ocean ridge	Galapagos Rift	1.0000	-90.6000	1600	2005 plume only
Zealandia	active, inferred	arc volcano	Mariana Arc	16.8800	145.8500	144	2003 plume only; 2009 or earlier ROV did not confirm activity
South Sarigan Seamount	active, inferred	arc volcano	Mariana Arc	16.5800	145.7800	240	2013 ROV HyperDolphin (did not confirm activity)
Okinawa Trough, Site ES2	active, inferred	back-arc spreading center	Okinawa Trough	28.8137	128.1028	779	1992 dredge only
Leyte	active, inferred	arc volcano	Luzon/Bicol Arc	11.5000	124.7000		2002 or earlier some indications of activity
EPR/Tamayo intersection	active, inferred	mid-ocean ridge	N EPR	22.9333	-108.0667	3200	1979 submersible Alvin did not confirm activity
Naung	active, inferred	arc volcano	Sangihe Arc	3.7791	125.3750	600	2001 dredge only, 2003 CTD only
Mariana Trough, 16.5 N	active, inferred	back-arc spreading center	Mariana Trough	16.4010	144.8700	3829	2015 plume only
Galapagos Rift, 93.7 W	active, inferred	mid-ocean ridge	Galapagos Rift	2.4970	-93.7700	2220	2005 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)
Fukujin volcano	active, inferred	arc volcano	Mariana Arc	21.9300	143.4700	1100	1987 deposits only
Tevnia	active, inferred	mid-ocean ridge	N EPR	10.3333	-103.5533	2925	1994 submersible Alvin did not confirm activity
Alarcon Rise/Pescadero intersection	active, inferred	mid-ocean ridge	Gulf of California	23.6423	-108.3948	2384	2015 ROV Doc Ricketts did not confirm activity
Mariana Trough, 18.2 N	active, inferred	back-arc spreading center	Mariana Trough	18.1080	144.7380	3916	2015 plume only
Gorda Ridge, EP96B	active, inferred	mid-ocean ridge	Gorda Ridge	42.5500	-126.8333	3400	1984 deposits only; 1996 plume only
NE Anatahan submarine volcano	active, inferred	arc volcano	Mariana Arc	16.3750	145.7250	460	2003 multibeam and sidescan sonar only
Nishinoshima Island	active, inferred	arc volcano	Izu-Bonin Arc	27.2367	140.8783	5	1975 SCUBA
EPR, southern 16 N segment	active, inferred	mid-ocean ridge	N EPR	15.5000	-105.4000	2300	1997 plume only
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
W Eye of Mordor	inactive	mid-ocean ridge	Galapagos Rift	1.9707	-91.3900	1600	2005 towed video Medea observed inactive chimneys
Dellwood Seamount	inactive	mid-ocean ridge	Explorer Ridge	50.7470	-130.8961	800	1974 or earlier deposits only; 2018 ROV Hercules inactive
DSDP Hole 504B	inactive	mid-ocean ridge	Galapagos Rift	1.2267	-83.7300	3500	NotProvided
Explorer Deep	inactive	mid-ocean ridge	Explorer Ridge	50.1000	-129.7500	3200	1969, 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
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
Philippine Ridge, West Philippine Basin	inactive	back-arc spreading center	West Philippine Basin	12.0000	131.4170	5800	NotProvided
Shinkurose Bank	inactive	arc volcano	Izu-Bonin Arc	33.5667	140.1667	200	1992 or earlier submersible Shinkai 2000
Parece Vela Ridge, Philippine Sea	inactive	back-arc spreading center	Parece Vela Basin	16.0000	139.1667	5000	NotProvided
Guaymas Basin, Northern Trough	inactive	mid-ocean ridge	Gulf of California	27.3050	-111.5067	2000	1977 submersible Seacliff (hydrothermal deposits only)
Galapagos Rift, 95 W	inactive	mid-ocean ridge	Galapagos Rift	2.5000	-95.1667	2600	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
Gorda Ridge, 41 30'N	inactive	mid-ocean ridge	Gorda Ridge	41.5167	-127.4500	3350	1984 deposits only
Nishi-Shichito Ridge	inactive	arc volcano	Izu-Bonin Arc	31.3667	138.7500	1600	NotProvided
Green Seamount	inactive	mid-ocean ridge	N EPR	20.8033	-109.2833	2000	1982 submersible Alvin observed only inactive
Hawaiian Ridge	inactive	intra-plate volcano	Central Pacific	15.0000	-157.5000	5000	1987 or earlier
Kurose Hole	inactive	arc volcano	Izu-Bonin Arc	33.4000	139.6800	760	1989 inactive; 2009 inactive
Kasuga 1 Seamount	inactive	arc volcano	Mariana Arc	21.7650	143.7100	600	2003 no plume detected
Paramushir Island	inactive	arc volcano	Kuril Arc	50.3300	155.5000	800	NotProvided

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