碩士 / 國立臺灣海洋大學 / 應用地球科學研究所 / 99 / The major tectonic structures of Taiwan offshore area include the convergence between the Eurasia and Philippine Sea plates, and the complexity of compression and uplift of the Manila subduction and Ryukyu subduction systems. The data in this research were obtained from Leg 4 of 2009 TAIGER Project. In this experiment, we used 40 air guns (integrated in 10 arrays and had a total power of 6,000 cu-in in 2,000 psi each gun). Because of this big sound source, therefore, the refracted signals can be recorded up to 100 – 150 km from the ship. The seismic ship was R/V Macus Langseth of Lamont-Doherty Geological Observatory, Columbia University. The OBS, placed on the seafloor (from several hundred to several thousand meters of water depth) were responsible to collect artificial seismic source and provided us to analyze the P wave velocity model. The profile used in this research is the T2 lines, consisting of the MGL0908_01 and MGL0908_09 sections. The line was arranged in nearly east to west direction which is consisting of 12 American Scripps OBSs and 19 Taiwanese OBSs (total of 31 OBSs). The T2 line across the Manila Trench, Luzon Arc and Gagua Ridge (the major structure is striking about north to south direction). We use the software, the OBSTOOL, developed by University of Texas for picking the first arrivals, and conduct the Tomo2D software, developed by Korenaga et al. （2000）to model the P wave velocity model and analyze the tectonic structures of study area. Using the P wave velocity model and earthquake data from the CWB and the Philippine, we suggest that the complex terrains and frequent earthquake which make the collision and subduction of the Manila subductionn system and its associated high-speed velocity structure zones (the possible extension of the Luzon Arc). From the OBS, MCS, gravity, earthquake, and multi-beam echo sounding data, depth and data, we propose that the tsunami disaster that could be caused by the long-extension of the overlapping off-sequence and splay faults within the Manila subduction zone. The Gagua Ridge is interpreted as the4 initial subduction of the West Philippine Basin.
| Identifer | oai:union.ndltd.org:TW/099NTOU5135007 |
| Date | January 2011 |
| Creators | Hao-Wei Wu, 吳浩維 |
| Contributors | Chao-Shing Lee, 李昭興 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 53 |
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