Site summaries (continued)

Proposed Site NT1-03C
Alternate for proposed Site NT1-03B
33°2.000′N, 136°47.403′E
Water depth (m):
Target drilling depth (mbsf):
950 sediment (Stage 1)
Approved maximum penetration (mbsf):
1800; approved by CDEX and TAMU safety panels based on EPSP Jan 2007 recommendation
Survey coverage:
CDEX 2006 3-D MCS; extensive survey data outlined in Proposal 603A-Full2 (
• Track map (Fig. AF15)
• CDEX/IFREE 3-D inline (Fig. AF16)
(see text for full details):
Penetrate the toe of the Nankai accretionary prism to:
• Characterize incoming sedimentary sequence (lithologic, hydrologic, thermal, geotechnical, geochemical properties)
• Document early phases of deformation
• Verify location of frontal décollement
Although penetration to basement is desirable, a more important goal is to sample as much of the lower Shikoku Basin as possible.
Drilling, coring, and downhole measurement program:
See NT1-03B
Anticipated lithology:
0–200 mbsf: hemipelagics and slumped trench material
200–850 mbsf: uplifted trench turbidites
~850 mbsf: frontal thrust
850–1290 mbsf: trench wedge turbidites
1290–1550 mbsf: upper Shikoku Basin hemipelagics and volcanic ash
1550–2920 mbsf: lower Shikoku Basin hemipelagics and turbidites