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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/32264

Title: The PSDM and Travel-Time Inversion of MCS and OBS Data for Imaging Sedimentary and Crustal Structures across the Gagua Ridge, West Philippine Basin
Authors: Mirza A.;Yang B. J.;Wang T. K.;Hsu S.;Lee C.
Contributors: NTOU:Institute of Applied Geosciences
Keywords: [3025] MARINE GEOLOGY AND GEOPHYSICS / Marine seismics
Date: 2011-12
Issue Date: 2012-06-15T07:43:50Z
Publisher: American Geophysical Union
Abstract: abstract:Two Multi-Channel Seismic (MCS) lines (EW9509-3 and EW9509-19) and one recently acquired MCS line MGL0908-09 with 5 Ocean-Bottom Seismometers (OBS) from TAIGER project were investigated across the Gagua Ridge in the West Philippine Basin. The Pre-Stack Depth Migration (PSDM) is implemented to process these seismic reflection lines in sedimentary layers and to image variations of sedimentary thickness and velocity near the ridge. Initial crustal model along line MGL0908-09 is built by using the PSDM result and previous free-air gravity studies around the line MGL0908-09. Inversion of refracted, reflected, and head-wave arrivals from OBS data is subsequently applied to build P-wave velocity model from the shallowest layer until the deepest one. Results from line MGL0908-09 suggest that the material beneath the ridge is hard structures of the crust whereas the sedimentary layers in eastern and western sides onlap the ridge and adjacent to the oceanic basement. The thickness of sediment from west and east sides across the ridge is about 2 km and 3 km respectively, while seafloor on the west side is higher about 0.8 km from the east side. This is due to the ridge dammed the sediment derived to the west from Taiwan mountain belt, and to reach the east part of the ridge the sediment only has Ryukyu Trench for passage. P-wave velocity model shows the crustal thickness below the Gagua Ridge is about 10 km, while remains about 6 km to 7 km thick as normal oceanic crust on both sides of Gagua Ridge. The compression due to northwest convergence of the Philippine Sea Plate may cause these variations of crustal thickness from west to east of the Gagua Ridge.
URI: http://ntour.ntou.edu.tw/handle/987654321/32264
Appears in Collections:[應用地球科學研究所] 演講及研討會

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