碩士 / 國立臺灣大學 / 海洋研究所 / 106 / The Taiwan orogenic system is the result of the collision between the Luzon arc and the Asian continental margin with east-dipping subduction. The Philippine Sea plate moves to the northwest at a rate of 82 km/Ma relative to Eurasian plate, forms a series of fold-and-thrust belts with north-south direction. The obliquity between the Luzon arc and the Asian continental margin suggests a time-for-space equivalence. The collision began in the north about 5 million years ago, reached the middle of the island about 3 million years ago, and is just beginning near the southern Taiwan. The westernmost faults represent the deformation front. Nowadays, the major seismic activity is located in the Chukou-Chelungpu fault zone in Central Taiwan. In 1999, the largest inland seismic event of the century, Chi-Chi earthquake, which happened along the Chelungpu fault. The seismicity did not cross the Da’an stream to the north, because of the Sanyi-Puli Seismic Zone, a distinct NW-SE trending linear transition zone, probably controlled the morphology of the thrusts in northwestern Taiwan. Geologists indicate that the deformation front along the Da’an stream developed in the Miaoli-Hsinchu offshore. However, lack of the geological and geophysical data in the Miaoli-Hsinchu offshore, the location of the deformation front is uncertainty. This study collected the high-resolution geophysical surveys to define the location of the shallow structures and predict the seismicity of the faults in Taiwan. The reflection seismic profiles show a thrust fault with a low dip angle offset the Toukoshan Formation, representing the Hsinchu offshore has been in the Taiwan Orogeny.
| Identifer | oai:union.ndltd.org:TW/106NTU05279007 |
| Date | January 2017 |
| Creators | Yi-Sin Wu, 吳宜欣 |
| Contributors | 宋國士 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 87 |
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