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Structural restoration and application of dynamic Coulomb wedge theory to the Nankai Trough accretionary wedge toe

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Item Summary

Title: Structural restoration and application of dynamic Coulomb wedge theory to the Nankai Trough accretionary wedge toe
Authors: Studer, Melody A.
Keywords: Subduction zones -- Japan -- Pacific Coast
Geology, Structural -- Japan -- Pacific Coast
Nankai Trough
Issue Date: 2007
Abstract: A three-dimensional (3-D) prestack depth migrated seismic reflection data volume acquired off Shikoku Island, Japan, (Muroto Transect) images the seaward portion of the accretionary prism where the Philippine Sea plate subducts beneath the Eurasian Plate. We use structural restoration software (LithoTect®), in combination with velocity-porosity transforms derived from seismic interval velocities, to calculate and interpret total horizontal shortening lengths along four cross-sectional profiles through the volume. The results reveal that 63-82% of the total horizontal shortening results from strain. Evaluation of conjugate thrust pairs indicate a relatively low coefficient of internal friction (µ≈0.2-0.3) and basal friction (µb"≈0.025) along the wedge, suggesting that sediments deform internally yet still maintain low sediment strength during the initial stages of accretion. Application of the dynamic Coulomb theory demonstrates that the current state of the Muroto Transect outer wedge toe is in a near-critical stable state and may become critical upon small increases in either basal friction or fluid pressure observed during seismic rupture.
Description: Thesis (M.S.)--University of Hawaii at Manoa, 2007.
Includes bibliographical references (leaves 66-78).
x, 78 leaves, bound ill. (some col.), map 29 cm
Rights: All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections:M.S. - Geology and Geophysics

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