Table T1. Primary and alternate proposed sites, Expedition 346.
| Site | Latitude | Longitude | Water depth (m) | Penetration depth (mbsf) | Comments |
|---|---|---|---|---|---|
| Primary: | |||||
| YB-1 | 35°57.92’N | 134°26.06’E | 316 | 550 | Shallow water; very gassy (H2S) sediment possible Inside Japan’s EEZ; may not be approved Pleistocene sediment |
| YB-2 (798) | 37°02.00’N | 134°48.00’E | 930 | 450 | Gassy (H2S) sediment possible Pliocene sediment |
| YR-1 | 39°29.44’N | 134°26.55’E | 1917 | 500 | Miocene to Pleistocene sediment |
| JB-1 (794) | 40°11.40’N | 138°13.90’E | 2811 | 200 | Pliocene sediment |
| JB-2 | 41°41.95’N | 139°04.98’E | 1785 | 250 | Pliocene sediment |
| JB-3 (795) | 43°45.99’N | 138°49.99’E | 3435 | 250 | Pliocene sediment |
| UB-1 | 37°54.16’N | 131°32.25’E | 1064 | 335 | Gassy (H2S) sediment possible Miocene to Pleistocene sediment |
| ECS-1B | 31°40.64’N | 129°02.00’E | 746 | 850 | Gassy sediment possible |
| Alternate: | |||||
| YB-3 (797) | 38°37.00’N | 134°32.00’E | 2874 | 250 | Pliocene sediment |
| ECS-1C* | 31°37.04’N | 128°59.85’E | 735 | 500 | Gassy sediment possible Pliocene sediment |
All penetration depths shown have been approved by the Environmental Protection and Safety Panel. Gassy to very gassy sediments may be found at shallower sites (<1500 m water depth). Previously drilled Ocean Drilling Program (ODP) sites numbers are in parentheses. ODP Site 795 is 40 km northeast of proposed Site JB-3. ODP Hole 794A penetrated 351.3 mbsf; Hole 794D penetrated 733.5 mbsf. ODP Hole 797C penetrated 900 mbsf. ODP Hole 798B penetrated 517.9 mbsf. ODP Hole 795B penetrated 762.2 mbsf. EEZ = Exclusive Economic Zone.
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