| Analysis on small-earthquake composite fault plane solutions from 1961 to 1999 in Xinfengjiang reservoir area |
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| 作者姓名： | 郭贵安 刘特培 秦乃岗 陈丽芬 |
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| 作者单位： | Shenzhen Seismostation，Shenzhen 518003，China，Earthquake Administration of Guangdong Province，Guangzhou 510070，China，Earthquake Administration of Guangdong Province，Guangzhou 510070，China，Earthquake Administration of Guangdong Province，Guangzhou 510070，China |
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| 基金项目： | Seismic Research Foundation of Residential Office in Shenzhen，China Earthquake Administration (2003-1000). |
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| 摘 要： | Introduction XFJ reservoir has been about 40 years since its water loading in 1959 and has induced a great number of earthquakes. The largest one was the M = 6.1 earthquake occurred on March 19, 1962. Since then, a large amount of seismologists in our country have made many researches on the in-duced earthquake. In the paper, we have studied XFJ reservoir earthquakes and their relation with water cyclic fluctuation by using the mechanism solutions of small earthquakes occurred in these 40 y…
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| 关 键 词： | Mohr′s stress circle |
| 收稿时间： | 9 September 2002 |
| 修稿时间： | 28 December 2003 |
Analysis on small-earthquake composite fault plane solutions from 1961 to 1999 in Xinfengjiang reservoir area |
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| Guo Gui-an , Liu Te-pei , Qin Nai-gang and Chen Li-fen.Analysis on small-earthquake composite fault plane solutions from 1961 to 1999 in Xinfengjiang reservoir area[J].Acta Seismologica Sinica(English Edition),2004,17(3):287-295. |
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| Authors: | Guo Gui-an Liu Te-pei Qin Nai-gang and Chen Li-fen |
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| Institution: | 1. Shenzhen Seismostation, Shenzhen 518003, China
2. Earthquake Administration of Guangdong Province, Guangzhou 510070, China |
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| Abstract: | To understand the earthquake characteristics in Xinfengjiang (XFJ for short) reservoir area, we collected the small earthquakes occurred in the area from 1961 to 1999. We segmented this 40-year period, parted the research region and calculated the composite fault plane solution of each block, disscussed the effect characteristics of stress field of water pressure using Mohrs stress circle. The final result shows that the main rupture pattern was very different before and after the M = 6.1 main shock, changing from strike slip to normal rupture. The maximum principal stress axes of composite fault plane solutions are characterized by synchronous change with water level. |
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| Keywords: | Xinfengjiang reservoir Mohrs stress circle focal mechanism CLC number: P315 3 Document code: A |
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