Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002
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 afte...
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| Format: | Article |
| Language: | English |
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Springer
2010-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
| Subjects: | |
| Online Access: |
http://tao.cgu.org.tw/images/attachments/v213p477.pdf
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| _version_ | 1818038259989610496 |
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| author | Yi-Ling Huang Bor-Shouh Huang Kuo-Liang Wen Ya-Chuan Lai Yi-Ru Chen |
| author_facet | Yi-Ling Huang Bor-Shouh Huang Kuo-Liang Wen Ya-Chuan Lai Yi-Ru Chen |
| author_sort | Yi-Ling Huang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-10T07:39:54Z |
| format | Article |
| id | doaj.art-57ea8271e2564a57a2b149d5b45cfbc9 |
| institution | Directory Open Access Journal |
| issn | 1017-0839 2311-7680 |
| language | English |
| last_indexed | 2024-12-10T07:39:54Z |
| publishDate | 2010-01-01 |
| publisher | Springer |
| record_format | Article |
| series | Terrestrial, Atmospheric and Oceanic Sciences |
| spelling | doaj.art-57ea8271e2564a57a2b149d5b45cfbc92022-12-22T01:57:20ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802010-01-0121347710.3319/TAO.2009.12.11.01(TH)926Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002Yi-Ling HuangBor-Shouh HuangKuo-Liang WenYa-Chuan LaiYi-Ru ChenAccording 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. http://tao.cgu.org.tw/images/attachments/v213p477.pdf Frequency-wavenumber spectrum analysisConverted wavesReflectionTopography effect |
| spellingShingle | Yi-Ling Huang Bor-Shouh Huang Kuo-Liang Wen Ya-Chuan Lai Yi-Ru Chen Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002 Terrestrial, Atmospheric and Oceanic Sciences Frequency-wavenumber spectrum analysis Converted waves Reflection Topography effect |
| title | Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002 |
| title_full | Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002 |
| title_fullStr | Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002 |
| title_full_unstemmed | Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002 |
| title_short | Investigation for Strong Ground Shaking across the Taipei Basin during the MW 7.0 Eastern Taiwan Offshore Earthquake of 31 March 2002 |
| title_sort | investigation for strong ground shaking across the taipei basin during the mw 7 0 eastern taiwan offshore earthquake of 31 march 2002 |
| topic | Frequency-wavenumber spectrum analysis Converted waves Reflection Topography effect |
| url |
http://tao.cgu.org.tw/images/attachments/v213p477.pdf
|
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