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Three-dimensional simulations of seismic-wave propagation in the Taipei basin with realistic topography based upon the spectral-element method

Lee, Shiann-Jong and Chen, How-Wei and Liu, Qinya and Komatitsch, Dimitri and Huang, Bor-Shouh and Tromp, Jeroen (2008) Three-dimensional simulations of seismic-wave propagation in the Taipei basin with realistic topography based upon the spectral-element method. Bulletin of the Seismological Society of America, 98 (1). pp. 253-264. ISSN 0037-1106. doi:10.1785/0120070033.

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We use the spectral-element method to simulate strong ground motion throughout the Taipei metropolitan area. Mesh generation for the Taipei basin poses two main challenges: (1) the basin is surrounded by steep mountains, and (2) the city is located on top of a shallow, low-wave-speed sedimentary basin. To accommodate the steep and rapidly varying topography, we introduce a thin high-resolution mesh layer near the surface. The mesh for the shallow sedimentary basin is adjusted to honor its complex geometry and sharp lateral wave-speed contrasts. Variations in Moho thickness beneath Northern Taiwan are also incorporated in the mesh. Spectral-element simulations show that ground motion in the Taipei metropolitan region is strongly affected by the geometry of the basin and the surrounding mountains. The amplification of ground motion is mainly controlled by basin depth and shallow shear-wave speeds, although surface topography also serves to amplify and prolong seismic shaking.

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Tromp, Jeroen0000-0002-2742-8299
Additional Information:© 2008 Seismological Society of America. This research is a collaborative effort between California Institute of Technology, Institute of Earth Sciences, Academia Sinica (IESAS) (Taiwan), and National Central University (NCU) (Taiwan). The authors would like to thank S.-B. Yu and J.-P. Avouac for making this collaboration possible. Special thanks go to IESAS and the Caltech Seismo Lab, where many fruitful discussions occurred. Most of the simulations were carried out on Caltech’s Division of Geological & Planetary Sciences Dell cluster. This research was supported by Academia Sinica, Taiwan, Republic of China, under Grant Number AS-94-TP-A08, and by the U.S. National Science Foundation under Grant Number EAR-0309576.
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Academia SinicaAS-94-TP-A08
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Record Number:CaltechAUTHORS:LEEbssa08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13845
Deposited By: Tony Diaz
Deposited On:14 Jul 2009 18:23
Last Modified:08 Nov 2021 22:41

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