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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45414

Title: Velocity-interface structure of the southwestern Ryukyu subduction zone from EW9509-1 OBS/MCS data
Authors: Tan K. Wang;Kirk McIntosh;Yosio Nakamura;Char-Shine Liu;How-Wei Chen
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Date: 2001
Issue Date: 2018-03-16T08:32:21Z
Publisher: Marine Geophysical Researches
Abstract: Abstract:A wide-angle seismic survey, combining ocean-bottom seismometers (OBS) and multi-channel seismic (MCS) profiling, was implemented in the southwestern Ryukyu subduction zone during August and September 1995. In this paper, we present the data analysis of eight OBSs and the corresponding MCS line along profile EW9509-1 from this experiment. Seismic data modeling includes identification of refracted and reflected arrivals, initial model building from velocity analysis of the MCS data, and simultaneous and layer-stripping inversions of the OBS and MCS arrivals. The velocity-interface structure constructed along profile EW9509-1 shows that the northward subduction of the Philippine Sea Plate has resulted in a northward thickening of the sediments of the Ryukyu Trench and the Yaeyama accretionary wedge north of the trench. The boundary between the subducting oceanic crust and the overriding continental crust (represented by a velocity contour of 6.75 km/s) and a sudden increase of the subducting angle (from 5 degrees to 25 degrees) are well imaged below the Nanao Basin. Furthermore, velocity undulation and interface variation are found within the upper crust of the Ryukyu Arc. Therefore, the strongest compression due to subduction and a break-off of the slab may have occurred and induced the high seismicity in the forearc region.
Relation: 22(4) pp.265-287
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45414
Appears in Collections:[應用地球科學研究所] 期刊論文

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