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Logging and core-log-seismic integration

Hole C0012 B logging data quality

No scientifically useful wireline logging data were obtained at Site C0012, on a side track of Hole C0012A (see "Operations").

Seismic analysis

Seismic stratigraphy

We tried to consistently trace the seismic units identified at Site C0011 up to Site C0012 throughout the three dimensional (3-D) seismic data. In-line 95 and Cross-line 435 of the 3-D prestack depth migration (PSDM) across Site C0012 and their interpretations are shown in Figures F21 and F59, respectively. Based on reflection characteristics, we identified six of the seven major seismic reflection units that were identified at Site C0011. Unit F is missing around this site. Units A and B both show several discontinuous and chaotic reflectors, and the Unit A/B boundary is more or less continuous along Cross-line 435 and ambiguous on In-line 95. Compared with Site C0011 seismic profiles, they represent a significant thickness decrease. On In-line 95, the upper boundary of Unit C, which is highly reflective, shows more or less continuous reflection, whereas the lower boundary is quite disrupted. The ~200 m thick Unit D is characterized by a transparent reflection character. Unit E, a series of strong reflectors just above Unit G, seems to show thickness changes and unconformably overlies the basement Unit G. We recognize a normal fault on the northwest flank of Unit E. Unit E appears to show northeast tilting on Cross-line 435, even though its upper and lower boundaries are limited to the central part of the profile because of a lack of sufficient common depth point coverage. Unit G is oceanic crust of the Philippine Sea plate.

Based on core-log-seismic integration at Site C0011 and lithologic/seismic correlation between Sites C0011 and C0012, seismic Units A–B, C, D, and E correspond to lithologic Units I, II, III–upper IV, and lower IV–V, respectively.