Significant crustal structural variation across the Chaochou Fault, southern Taiwan: New tectonic implications for convergent plate boundary |
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Authors: | Chi-Chia Tang Lupei Zhu Chau-Huei Chen Ta-Liang Teng |
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Institution: | a Institute of Seismology, National Chung Cheng University, 168 University Rd., Min-Hsiung, Chia-Yi County 62102, Taiwan, ROC;b Dept. of Earth and Atmos. Sciences, Saint Louis University, 3642 Lindell Blvd, Saint Louis, MO 63108, USA;c Dept. of Earth Sciences, University of Southern California, 3651 Trousdale Parkway, Los Angeles, CA 90089, USA |
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Abstract: | The Chaochou Fault, a major geological boundary in southern Taiwan is considered to be a part of the convergent plate boundary between the Eurasia Plate and the Philippine Sea Plate. We applied the Common Conversion Point stacking technique to teleseismic radial receiver functions and obtained Moho variation and crustal structure across the Chaochou Fault. In the Eurasia Plate to its west, the Moho depth is about 37 km and the crust is subducting to the east beneath the Philippine Sea Plate with a dip angle of about 30° between the Backbone Belt and the Tananao Schist. In the Philippine Sea Plate, the Moho depth is about 17 km. The Longitudinal Valley marks the collision boundary between the Eurasia Plate and the Philippine Sea Plate. The results suggest that the depth extent of the Chaochou Fault is about 30–35 km and the fault becomes a “shallow-angle” thrust fault at depth. The Common Conversion Point image also shows several bending interfaces of velocity contrast in the crust. We proposed a simple model to explain the Philippine Sea Plate and Eurasia Plate collision process and the observed crustal deformations. |
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Keywords: | Plate boundary Moho depth Crustal structure |
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