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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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