Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan Region
In this study a new tomographic method is applied to over 43,400 high-quality absolute direct P arrival times and 200,660 relative P arrival times to determine detailed 3D crustal velocity structures as well as the absolute and relative hypocenter parameters of 2809 seismic events under the Beijing-...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2011/216315 |
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| _version_ | 1832549342735499264 |
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| author | Xiangwei Yu Wenbo Zhang Yun-tai Chen |
| author_facet | Xiangwei Yu Wenbo Zhang Yun-tai Chen |
| author_sort | Xiangwei Yu |
| collection | DOAJ |
| description | In this study a new tomographic method is applied to over 43,400 high-quality absolute direct P arrival times and 200,660 relative P arrival times to determine detailed 3D crustal velocity structures as well as the absolute and relative hypocenter parameters of 2809 seismic events under the Beijing-Tianjin-Tangshan region. The inferred velocity model of the upper crust correlates well with the surface geological and topographic features in the BTT region. In the North China Basin, the depression and uplift areas are imaged as slow and fast velocities, respectively. After relocation, the double-difference tomography method provides a sharp picture of the seismicity in the BTT region, which is concentrated along with the major faults. A broad low-velocity anomaly exists in Tangshan and surrounding area from 20 km down to 30 km depth. Our results suggest that the top boundary of low-velocity anomalies is at about 25.4 km depth. The event relocations inverted from double-difference tomography are clusted tightly along the Tangshan-Dacheng Fault and form three clusters on the vertical slice. The maximum focal depth after relocation is about 25 km depth in the Tangshan area. |
| format | Article |
| id | doaj-art-ebb2ccbe639648a98d6f3a7f248ff1db |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-ebb2ccbe639648a98d6f3a7f248ff1db2025-02-03T06:11:34ZengWileyInternational Journal of Geophysics1687-885X1687-88682011-01-01201110.1155/2011/216315216315Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan RegionXiangwei Yu0Wenbo Zhang1Yun-tai Chen2Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, ChinaKey Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, ChinaSchool of Earth and Space Sciences, Peking University, Beijing 100871, ChinaIn this study a new tomographic method is applied to over 43,400 high-quality absolute direct P arrival times and 200,660 relative P arrival times to determine detailed 3D crustal velocity structures as well as the absolute and relative hypocenter parameters of 2809 seismic events under the Beijing-Tianjin-Tangshan region. The inferred velocity model of the upper crust correlates well with the surface geological and topographic features in the BTT region. In the North China Basin, the depression and uplift areas are imaged as slow and fast velocities, respectively. After relocation, the double-difference tomography method provides a sharp picture of the seismicity in the BTT region, which is concentrated along with the major faults. A broad low-velocity anomaly exists in Tangshan and surrounding area from 20 km down to 30 km depth. Our results suggest that the top boundary of low-velocity anomalies is at about 25.4 km depth. The event relocations inverted from double-difference tomography are clusted tightly along the Tangshan-Dacheng Fault and form three clusters on the vertical slice. The maximum focal depth after relocation is about 25 km depth in the Tangshan area.http://dx.doi.org/10.1155/2011/216315 |
| spellingShingle | Xiangwei Yu Wenbo Zhang Yun-tai Chen Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan Region International Journal of Geophysics |
| title | Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan Region |
| title_full | Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan Region |
| title_fullStr | Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan Region |
| title_full_unstemmed | Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan Region |
| title_short | Seismic Imaging and Seismicity Analysis in Beijing-Tianjin-Tangshan Region |
| title_sort | seismic imaging and seismicity analysis in beijing tianjin tangshan region |
| url | http://dx.doi.org/10.1155/2011/216315 |
| work_keys_str_mv | AT xiangweiyu seismicimagingandseismicityanalysisinbeijingtianjintangshanregion AT wenbozhang seismicimagingandseismicityanalysisinbeijingtianjintangshanregion AT yuntaichen seismicimagingandseismicityanalysisinbeijingtianjintangshanregion |