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Priority:
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Primary
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Position:
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32.39809°N, 140.36548°E (1.8 km from the nearest submarine cable.)
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Water depth (m):
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1776.6
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Target drilling depth (mbsf):
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150
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Approved maximum penetration (mbsf):
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Not yet approved
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Survey coverage:
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• Cruise KR08-09, Line IBM-EW5, CDP 8376, and Line IBM-NS5, CDP 8626 (Figs. AF1, AF2, AF3, AF4)
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Objective(s):
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CDEX requires sediment properties information for a potential future deep (5500 mbsf) drilling program at proposed Site IBM-4 with the Chikyu. In particular, shear strength data are needed to design the top hole for riser installation. Preliminary data from IODP Site 792 (0–64 mbsf) indicate a formation strength that is weaker than those for other riser expeditions (Nankai and Shimokita).
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Coring program:
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One hole will be drilled to 150 mbsf using the APC/XCB system. The APC will be used as far as possible, and at APC refusal depth the XCB will be used.
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Wireline logging program:
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None
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Anticipated lithology:
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Silty clay
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