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|Title: ||Imaging of crustal structures in the northernmost South China Sea based on TAIGER-OBS data|
|Authors: ||Wang T. K.;J. M. Deng;B. J. Yang;C. S. Lee;C. S. Liu|
|Contributors: ||NTOU:Institute of Applied Geosciences|
|Issue Date: ||2011-10-20T08:19:02Z
|Abstract: ||In April 2009, 36 ocean-bottom seismometers (OBS) recorded strong air-gun shots from RV Marcus Langseth of the TAIGER (TAIwan GEodynamic Research) experiment along three profiles (MGL0905-1, 8, 10) in the northernmost South China Sea. Intersection of these three profiles was located east of the deformation front in the Manila subduction zone where bottom-simulated reflectors (BSR) above the Taiwan accretionary prism are prevailed in the reflection seismic data. Stacking velocity of the reflection seismic data along three profiles was provided for constraining the sedimentary structure, and first arrivals of OBS data were used for inverting the crustal structure. The results delineate the deformation front from the sea floor, through the sediment, and at least to the upper crust. West of the deformation front, the transitional crust below the continental slope consisted of mainly the extended and thinned continental crust. East of the deformation front, the accretionary prism, with a large lateral variation of velocity (3-4.5 km/s) and a thickness of 12 km at least, is imaged. Velocity variation in the prism can be interpreted due to fractures or thrust faults where free gas can be migrated upward and accumulated below the BSR.|
|Appears in Collections:||[應用地球科學研究所] 演講及研討會|
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