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题名: Source complexity of the 4 March 2010 Jiashian, Taiwan, Earthquake determined by joint inversion of teleseismic and near field data
作者: Bor-Shouh Huang
Shiann-Jong Lee
Laetitia Mozziconacci
Wen-Tzong Liang
Ya-Ju Hsu
Wen-Gee Huang
贡献者: 國立臺灣海洋大學:應用地球科學研究所
关键词: Computational seismology
Rupture process
Joint source inversion
Seismicity and tectonics
Inverse theory
日期: 2013-03
上传时间: 2017-02-06T07:11:18Z
出版者: Journal of Asian Earth Sciences
摘要: Abstract: The Jiashian earthquake (ML 6.4) occurred on 4 March 2010. It was the largest inland event in southern Taiwan of 2010. The mainshock location was unexpected since it occurred in an area with relatively low background seismicity. In addition, reports of earthquake focal mechanisms do not fit with any known active fault geometry. In order to understand the origin of this earthquake, especially its rupture process, we perform a joint source inversion by using teleseismic body wave, GPS coseismic displacements and near field ground motion data. In this study, we considered a northwest–southeast trending fault with a northeast dip retrieved from GPS coseismic data and aftershocks distribution. To analyze the detailed slip distribution in space and time, we used near field 3D Green’s functions provided by spectral-element method and a full time–space inversion technique. We find a complex rupture process with several slip patches distributed inside two main asperities. The slip map reveals a mean slip of 12.9 cm for a maximum slip of 27.3 cm leading to a Mw 6.47 for this event. The rupture initiates in the deepest portion of the fault at 20 km depth, and propagated upward up to 2 km depth to form the two asperities. The source time function of this event revealed two pulses corresponding to the two asperities, for a total duration time of about 16 s. Most aftershocks occurred near the upper boundary of the deepest asperity while no aftershocks are located close to the shallowest one. We infer that the locations of these slip patches are related to the surrounding fault systems that may have restricted the rupture propagation during the earthquake.
關聯: 64
显示于类别:[應用地球科學研究所] 期刊論文


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