| Study on distribution characteristics of strong earthquakes in Sichuan-Yunnan area and their geological tectonic background |
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| 作者姓名： | 韩渭宾 蒋国芳 |
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| 作者单位： | Earthquake Administration of Sichuan Province，Chengdu 610041，China，Earthquake Administration of Sichuan Province，Chengdu 610041，China |
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| 基金项目： | State Key Basic Research Development and Programming Project of China (G1998040700/95-13-02-03). |
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| 摘 要： | Introduction Both Sichuan and Yunnan are provinces with more earthquakes. Based on catalogue of strong earthquakes in China compiled by the Prediction Department of China Earthquake Administration, there are 639 M5.0 earthquakes during 26 B.C.~A.D. 2001. Among them, 475 are M=5.0~5.9 events, 124 are M=6.0~6.9 events, 39 are M=7.0~7.9 events, and one is M=8 event occurred in Sichuan and Yunnan area. Here is one of the areas where seismic activities are most active in China. Sichuan-Yun…
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| 收稿时间： | 24 December 2002 |
| 修稿时间： | 3 May 2003 |
Study on distribution characteristics of strong earthquakes in Sichuan-Yunnan area and their geological tectonic background |
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| Han Wei-Bin and Jiang Guo-Fang.Study on distribution characteristics of strong earthquakes in Sichuan-Yunnan area and their geological tectonic background[J].Acta Seismologica Sinica(English Edition),2004,17(2):230-243. |
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| Authors: | Han Wei-Bin and Jiang Guo-Fang |
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| Institution: | Earthquake Administration of Sichuan Province, Chengdu 610041, China |
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| Abstract: | In the paper, the distribution characteristics of strong earthquakes in Sichuan-Yunnan area and their geological tectonic background, especially the relation to Sichuan-Yunnan and Sichuan-Qinghai crustal blocks have been studied. The main results are: a) Strong earthquakes in Sichuan-Yunnan area distribute mainly in Sichuan-Yunnan and Sichuan-Qinghai crustal blocks; b) Most of strong earthquakes of the two blocks distribute mainly along their boundary faults; c) A few strong earthquakes are not obviously related to active faults. It shows that the relation between strong earthquakes and geological tectonics can be very complex; d) There is a certain correlativity for seismic activities among boundary faults of the two blocks, but they have different features; e) There are some anomalous changes of velocity structures in the deep crust of boundary faults of the two blocks. Many boundary faults, especially Longmenshan fault, cut obviously the Moho discontinuity. The Xianshuihe fault, a typical strike-slip fault, has no obvious indication of cutting the Moho discontinuity, but has distinct low-velocity zone in different depths. |
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| Keywords: | Sichuan-Yunnan area seismicity crustal block deep structure |
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