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A reprocessed multichannel seismic reflection line across the ODP Leg 131 area allows well-controlled structural interpretations of the accretionary prism toe. A 2.5-km-wide protothrust zone is characterized by thickening and seaward tilting of the trench wedge strata, associated with a significant amount of layer-parallel shortening and fluid expulsion. The frontal thrust is imaged as a fault-plane reflection and ramps upward from a décollement within the Shikoku Basin hemipelagic section. Over this ramp, the overthrusting sediments form a fault-bend fold on which ODP Site 808 is located. The spacing of the first three thrusts at the toe of the prism is approximately 1.5-1.7 km. Thrust spacing decreases arcward to less than 1 km as horizontal shortening progresses. The polarity of the reflection marking the basal décollement is reversed under the trench and accretionary prism. This polarity reversal is generated by a zone of low velocity beneath the décollement, indicating that the subducting basin hemipelagic section has not dewatered to the extent that the section above has, and therefore may be overpressured.

Structural Framework of the ODP Leg 131 Area, Nankai Trough