| 大桥水库MS4.6级诱发地震的初步研究 |
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| 引用本文： | 胡先明,叶有清.大桥水库MS4.6级诱发地震的初步研究[J].四川地震,2005(4):25-31. |
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| 作者姓名： | 胡先明 叶有清 |
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| 作者单位： | 四川省地震局,四川,成都,610041 |
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| 摘 要： | 2002年3月3日大桥水库诱发了Ms4．6级水库地震，其发震构造是安宁河东支断裂近傍具有正断层性质的一个分支断裂。据大桥台网7年多库区地震观测事件记录，地震空间分布上水体附近有一个明显的活跃过程，大坝上游发生小震群，大坝下游发生主震序列。地震的震源深度在蓄水前后有明显变化。4．6级地震的震源机制解的主压应力轴方位和倾角与大多数活动断裂上的地震有明显的差别，主压应力轴的倾角与其它的水库地震相比也存在较大差别。
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| 关 键 词： | 大桥水库 诱发地震 正断层 |
| 文章编号： | 1001-8115(2005)04-0025-07 |
| 收稿时间： | 2005-02-18 |
| 修稿时间： | 2005-09-15 |
Primary study about the induced MS4.6 Daqiao Reservoir Earthquake |
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| HU Xian-ming,YE You-qing.Primary study about the induced MS4.6 Daqiao Reservoir Earthquake[J].Earthquake Research in Sichuan,2005(4):25-31. |
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| Authors: | HU Xian-ming YE You-qing |
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| Institution: | Earthquake Administration of Sichuan Province, Sichuan Chengdu 610041, China |
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| Abstract: | An Ms 4.6 Earthquake happened on 3 March 2002 in the area of Daqiao Reservoir. The causative fault is belong to the branch of Anninghe faults and is of normal. According to the data of seismic events 7 years from Daqiao Telemetered Seismic Network, the seismicity increased after storing water and the distribution of earthquakes is near the reservoir of Daqiao. First a seismic swarm with small magnitude happened and then the main seismic swarm happened. The depths of earthquakes are different between pre and post storing water. The direction and the dip angle of the principal axis of stress from the focal mechanism solution of Ms 4.6 Earthquake is different from that of seismic swarm. |
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| Keywords: | Daqiao Reservoir induced earthquake normal fault |
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