National Taiwan Ocean University Institutional Repository:Item 987654321/24773
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题名: Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002
作者: Yi-Ling Huang;Bor-Shouh Huang;Kuo-Liang Wen;Ya-Chuan Lai;Yi-Ru Chen
贡献者: NTOU:Institute of Applied Geosciences
國立臺灣海洋大學:應用地球科學研究所
关键词: Frequency-wavenumber spectrum analysis;Converted waves;Reflection;Topography effect
日期: 2010-06
上传时间: 2011-10-20T08:17:38Z
出版者: Terrestrial, Atmospheric And Oceanic Sciences
摘要: abstract:According to reconstructed ground motion snapshots of the northern Taiwan area during the MW 7.0 eastern Taiwan offshore earthquake of 31 March 2002, the composite effects indicated complicated wave propagation behavior in the ground motion of the Taipei basin. A major low frequency pulse arose after the S-wave with the duration of about 20 seconds was observed in northern Taiwan and dominated the radial direction. Observed waveforms of a low frequency pulse show amplification during the seismic wave across the Taipei basin from its eastern edge to western portion. This effect has been considered to be generated by an unusual source radiation, deep Moho reflection or basin bottom surface. In this study, recorded ground motions from a dense seismic network were analyzed using a frequency-wavenumber spectrum analysis for seismic wave propagation properties. We investigated temporal and spatial variations in strong shaking in different frequency bands. Results show that a simple pulse incident seismic wave strongly interacts with inside soft sediments and the surrounding topography of the Taipei basin which in turn extends its shaking duration. Evidence showed that seismic waves have been reflected back from its western boundary of basin with a dominant frequency near one Hz. Findings in this study have been rarely reported and may provide useful information to further constrain a three-dimensional numerical simulation for the basin response and velocity structure, and to predict ground motions of further large earthquakes.
關聯: 21(3), pp.485-493
URI: http://ntour.ntou.edu.tw/handle/987654321/24773
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