Site summary

Site C0002 (riser top hole)

Priority: Primary: Chikyu Expedition 326 (NanTroSEIZE Stage 3: plate boundary deep riser: top hole engineering)
Position: 33°18.0507′N, 136°38.2029′E
Water depth (m): 2060
Target drilling depth (mbsf): 800
Approved maximum penetration (mbsf): 7000
Survey coverage: CDEX 2006 3-D MCS; extensive survey data outlined in Proposal 603C-Full:
• 3-D In-line 2529
• 3-D Cross-line 6225
Objective (see text for full details): • Case riser hole to 3300 mbsf in preparation for future extension to 7000 mbsf, for future permanent observatory installation
• Determine nature of the plate boundary below the drill site
Drilling, coring, and downhole measurement program: • Set 36 inch casing to 60 mbsf
• Set 20 inch casing to 800 mbsf
Anticipated lithology: 0–150 mbsf: Kumano forearc basin sediments
150–910 mbsf: lower sediments
910–1400 mbsf: accretionary prism