https://scholars.lib.ntu.edu.tw/handle/123456789/614601
標題: | Coseismic deformation revealed by inversion of strong motion and GPS data: The 2003 Chengkung earthquake in eastern Taiwan | 作者: | Hu, Jyr-Ching YIH-MIN WU YUE-GAU CHEN HAO KUO-CHEN |
關鍵字: | coseismic process; displacement; earthquake event; fault geometry; GPS; seismic zone; strong motion; Asia; Chengkung; Eurasia; Far East; Taiwan | 公開日期: | 2007 | 出版社: | Oxford University Press | 卷: | 169 | 期: | 2 | 起(迄)頁: | 667-674 | 來源出版物: | Geophysical Journal International | 摘要: | A moderate earthquake of Mw = 6.8 occurred on 2003 December 10. It ruptured the Chihshang Fault in eastern Taiwan which is the most active segment of the Longitudinal fault as a plate suture fault between the Luzon arc of the Philippine Sea plate and the Eurasian plate. The largest coseismic displacements were 13 cm (horizontal) and 26 cm (vertical). We analyse 40 strong motion and 91 GPS data to model the fault geometry and coseismic dislocations. The most realistic shape of the Chihshang fault surface is listric in type. The dipping angle of the seismic zone is steep (about 60°-70°) at depths shallower than 10 km and then gradually decreases to 40°-50° at depths of 20-30 km. Thus the polygonal elements in Poly3D are well suited for modelling complex surfaces with curving boundaries. Using the strong motion data, the displacement reaches 1.2 m dip-slip on the Chihshang Fault and decreases to 0.1 m near surface. The slip averages 0.34 m, releasing a scalar moment of 1.6E26 dyne-cm. For GPS data, our model reveals that the maximal dislocation is 1.8 m dip-slip. The dislocations decrease to 0.1 m near the surface. The average slip is 0.48 m, giving a scalar moment of 2.2E26 dyne-cm. Regarding post-seismic deformation, a displacements of 0.5 m were observed near the Chihshang Fault, indicating the strain had not been totally released, as a probable result of near-surface locking of the fault zone. © 2007 The Authors Journal compilation © 2007 RAS. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-34247252062&doi=10.1111%2fj.1365-246X.2007.03359.x&partnerID=40&md5=bae806e1f1876221173cb586dcd3b0cc https://scholars.lib.ntu.edu.tw/handle/123456789/614601 |
ISSN: | 0956540X | DOI: | 10.1111/j.1365-246X.2007.03359.x |
顯示於: | 地質科學系 |
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