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doi:10.2204/iodp.proc.314315316.115.2009

Structural geology and geomechanics

Because of the lack of image data and the poor quality of the density and sonic logs, we derived general structural interpretations from the caliper, gamma ray, and resistivity logs. A number of washed out (high caliper) intervals occur in logging Unit III (Table T2; Fig. F8). Because the gamma ray and resistivity logs do not decrease through these intervals they probably represent poorly consolidated argillaceous material or, most likely, fault zones. Three prominent washout zones occur between 416 and 451 m LSF, with several others within tens of meters above and below this interval. This area of the borehole also corresponds to bright tilted reflectors, further strengthening the interpretation of these washout zones as faults.

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