PEAT-3 Line 3:
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2006 JD 095 20:27:35 UTC, SP 21183
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Nearest crossing:
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PEAT-5 Line 8 at 2006 JD 095 03:47:46 UTC, SP 12824
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Estimated crustal age (Ma):
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46
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Ship location:
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SP 21183: 10°30.999’N, 138°25.123’W
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Basement depth (m):
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5048 (6.719 s TWT)
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Sediment thickness (m):
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174 from Site 574 velocity profile (0.221 s TWT)
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Velocity (Mayer et al., 1985):
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Site PEAT-3C was chosen slightly west of the intersection between Lines 3 and 8 to maximize the thickness of the deeper section. The cross with Line 8, unfortunately, was just south of a minor basement hill. The low amplitudes of the seismic horizons suggest that the sediment is not lithified, fitting in with the shallow depth to basement. The drill site is a relatively small target, ~720 m across.
A second site, PEAT-3D, was chosen as an alternate (see "Proposed Site PEAT-3D [alternate to Site PEAT-3C]"). It is located ~2 km north of the cross between Lines 6 and 3 along Line 6. This alternate site has a slightly thinner basal section, although the total sediment column is slightly thicker. Subbottom profiling occasionally reveals indistinct horizons to ~60 m subsurface. However, over most of the area few or no subsurface horizons can be distinguished.
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