Site summaries (continued)

Proposed Site NT1-03A

Alternate for proposed Site NT1-03B
33°01.23258′N, 136°47.94852′E
Water depth (m):
Target drilling depth (mbsf):
600 sediment (Stage 1)
Approved maximum penetration (mbsf):
1800; approved by CDEX and TAMU safety panels based on EPSP Jan 2007 recommendation
Survey coverage:
Extensive survey data outlined in Proposal 603A-Full2 (
  • Track maps (Figs. AF11, AF4)
  • Lines odkm 03-K SP 2435 (Fig. AF12) and 95 (Fig. AF5)
  • CrossLine KR9806-12 (Fig. AF13)
  • IFREE 3-D Inline (Fig. AF14)
(see text for full details):
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:
0–20 mbsf: hemipelagics
200–400 mbsf: uplifted trench turbidites
~400 mbsf: frontal thrust
400–830 mbsf: trench wedge turbidites
830–1050 mbsf: upper Shikoku Basin hemipelagics and volcanic ash
1050–2700 mbsf: lower Shikoku Basin hemipelagics and turbidites