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 |
Kodakara-jima |
active, confirmed |
arc volcano |
Ryukyu Arc |
29.2166 |
129.3333 |
10 |
1993 or earlier, likely by SCUBA |
Taketomi Thermal Area |
active, confirmed |
arc volcano |
Ryukyu Arc |
24.3483 |
124.1017 |
23 |
1987 or earlier, likely by SCUBA |
Reykjanes Ridge, Area A |
active, inferred |
mid-ocean ridge |
Reykjanes Ridge |
62.4500 |
-25.4330 |
500 |
NotProvided |
Reykjanes Ridge, Area B |
active, inferred |
mid-ocean ridge |
Reykjanes Ridge |
59.8167 |
-29.6833 |
1000 |
1992 submersible Mir did not find vents |
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) |
Red Sea Rift, 18 N |
active, inferred |
mid-ocean ridge |
Red Sea |
17.9667 |
40.0667 |
1500 |
1980 submersible Pisces XI (deposits 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 |
Kebrit Deep |
active, inferred |
mid-ocean ridge |
Red Sea |
24.7233 |
36.2767 |
1590 |
1972 deposits 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 |
Shaban Deep |
active, inferred |
mid-ocean ridge |
Red Sea |
26.2250 |
35.3500 |
1540 |
1983 deposits only |
Nereus Deep |
active, inferred |
mid-ocean ridge |
Red Sea |
23.1670 |
37.2830 |
2400 |
1972 deposits only |
Suakin Deep |
active, inferred |
mid-ocean ridge |
Red Sea |
19.6333 |
38.7333 |
2850 |
1972 deposits only |
Parece Vela Ridge, Philippine Sea |
inactive |
back-arc spreading center |
Parece Vela Basin |
16.0000 |
139.1667 |
5000 |
NotProvided |
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, 37 48'S Axial Dome |
active, confirmed |
mid-ocean ridge |
Pacific-Antarctic Ridge |
-37.8000 |
-110.9167 |
2200 |
2001 towed video and TV-grab |
Pacific-Antarctic Ridge, 60 S segment |
active, inferred |
mid-ocean ridge |
Pacific-Antarctic Ridge |
-60.0000 |
-152.0000 |
2300 |
2009 plume only |
Pacific-Antarctic Ridge, 64 S segment |
active, inferred |
mid-ocean ridge |
Pacific-Antarctic Ridge |
-64.5000 |
-170.0000 |
2300 |
2009 plume only |
Higashi-Ensei |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
28.4393 |
128.1724 |
1220 |
2016 ROV Kaiko dives 723 and 724 |
Futagoyama |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
24.8674 |
123.3081 |
1270 |
2016 ROV Kaiko dive 717 |
Kueishan Island |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
24.8333 |
121.9500 |
30 |
1999, likely by SCUBA |
SPOT, Hatoma Knoll |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
24.8550 |
123.8410 |
1520 |
1999 submersible Shinkai 2000 |
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 |
Tarama Knoll |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
25.0916 |
124.5416 |
1990 |
2009 ROV HyperDolphin |
Kueishan Island, offshore |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
24.8333 |
122.0000 |
1200 |
2008 or earlier |
SPOT, Yonaguni Knoll IV |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
24.8490 |
122.7000 |
1385 |
2000 submersibles Shinkai 2000 and Shinkai 6500 |
Okinawa Trough, Site ES1 |
active, inferred |
back-arc spreading center |
Okinawa Trough |
30.3303 |
129.0827 |
521 |
1992 dredge only |
Higa |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
26.5550 |
126.2233 |
1485 |
2015 ROV Kaiko |
Okinawa Trough, Site ES2 |
active, inferred |
back-arc spreading center |
Okinawa Trough |
28.8137 |
128.1028 |
779 |
1992 dredge only |
Irabu Knoll |
active, confirmed |
back-arc spreading center |
Okinawa Trough |
25.2300 |
124.8800 |
1850 |
2000 submersible Shinkai 6500; 1986 seafloor photos did not confirm activity |