3-D Shear Wave Shallow Crustal Structures at Meishan Fault Zone using Ambient Noise Tomography
| Autor: | Ching-Yu Cheng, 鄭璟郁 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 1906 Ｍ7.1 Meishan earthquake occurred near Chiayi city in southwestern Taiwan and resulted in more than three thousands casualties and six thousands of buildings collapsed. Based on the geological survey, the Meishan fault zone a right-lateral strike-slip fault with a length of 25 kilometers, was the main contributor for this event. In previous studies, many researchers have done lot of investigation about the Meishan Fault zone, including geologic researches at surface and seismic explorations at shallow crust. However, there is still limited information about 3-D shallow crustal structure of this study area. Therefore, we deployed 100 Texan instruments (~2 km interval) between Aug. and Nov. 2015, covered around the Meishan Fault zone. We obtained a 3-D shear wave shallow crustal velocity structure using ambient noise tomography. The reliable periods of phase velocity from Rayleigh wave are 0.6 to 5.8 seconds, which correspond to around 0-5 km at depths. The results are consistent with surface geology and seismic explorations study. Furthermore, Meishan fault, Chiayi blind thrust, and Xiaomei anticline near the fault zone are observed from this study. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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