| 天祝-古浪5.4级地震震源机制和发震断层以及海原西断裂大震危险性讨论 |
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| 引用本文： | 李亚荣,朱新运.天祝-古浪5.4级地震震源机制和发震断层以及海原西断裂大震危险性讨论[J].西北地震学报,2002,24(3):236-240. |
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| 作者姓名： | 李亚荣 朱新运 |
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| 作者单位： | 1. 中国地震局兰州地震研究所,甘肃,兰州,730000
2. 浙江省地震局,浙江,杭州,310007 |
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| 基金项目： | 中国地震局兰州地震研究所论著编号 :LC2 0 0 2 0 39 |
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| 摘 要： | 研究了发生在海西断裂天祝拉分盆地1996年6月1日5.4级地震的震源机制，利用位于天祝－古浪地区的数字式微震监测台网纪录的余震的精确定位确定了本次地震的发震断层，研究表明这次地震是天祝拉分盆地中垂直于主断裂的近南北向断裂所形成，根据破裂模型和海原西断裂的应力积累状况，讨论了海原西断裂近期的大震危险性。
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| 关 键 词： | 天祝－古浪5.4级地震 震源机制 发震断层 地震危险性 |
| 文章编号： | 1000-0844(2002)03-0236-05 |
| 收稿时间： | 2002/5/9 0:00:00 |
| 修稿时间： | 2002年5月9日 |
DISCUSSION ON THE FOCAL MECHANISM, SEISMOGENIC FAULT OF TIANZHU-GULANG EARTHQUAKE (MS5.4)AND THE SEISMIC RISK OF WESTERN HAIYUAN FAULT |
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| Li Ya-rong and Zhu Xin-yun.DISCUSSION ON THE FOCAL MECHANISM, SEISMOGENIC FAULT OF TIANZHU-GULANG EARTHQUAKE (MS5.4)AND THE SEISMIC RISK OF WESTERN HAIYUAN FAULT[J].Northwestern Seismological Journal,2002,24(3):236-240. |
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| Authors: | Li Ya-rong and Zhu Xin-yun |
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| Institution: | Li Ya rong 1,Zhu Xin yun 2 |
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| Abstract: | The focal mechanism of MS 5.4 earthquake on June 1, 1996, in the Tianzhu pull-apart basin of western Haiyuan fault is studied. The seismogenic fault of the event is determined by using the precisely locating aftershocks, which recorded by the local digital seismic network.The result shows that the earthquake caused by the fracture of a nearly SN direction small fault, which perpendicular to western Haiyuan main fault, in the Tianzhu basin. The seismic risk along western Haiyuan fault is discussed on the basis of the fracture model and the condition of stress concentration in the area. |
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| Keywords: | Tianzhu-Gulang M S5 4 earthquake Focal mechanism Seismogenic fault Seismic risk |
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