| 内蒙古中西部地区小震震源机制解分析 |
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| 引用本文： | 刘芳,王晓山,杨雅琼.内蒙古中西部地区小震震源机制解分析[J].大地测量与地球动力学,2010,30(Z1). |
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| 作者姓名： | 刘芳 王晓山 杨雅琼 |
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| 作者单位： | 1. 内蒙古自治区地震局,呼和浩特,010010
2. 河北省地震局,石家庄,050021 |
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| 基金项目： | 国家“十一五”科技支撑计划重点项目(2006BAC01B02-01-01) |
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| 摘 要： | 利用P、S最大振幅比数据反演中小震震源机制方法,选取2001—2008年发生在内蒙古中西部的中小地震的数字波形数据,反演得到130个地震震源机制。研究结果表明,震源机制存在NWW-SEE向和NE-SW向的两组节面,受近NEE-SWW方位的压应力和NNW-SSE方位的张应力作用,NWW-SEE向的破裂面产生右旋走向滑动,NNW-SSE向的破裂面产生左旋走向滑动。系统聚类分析显示,内蒙古中西部中小地震以直立节面、走滑型震源机制解为主。通过对杭锦旗、托克托两次4级以上地震震源机制与背景场对比,认为均不是前兆地震。通过对震源机制的一致性参数分析,内蒙古中西部震源机制一致性参数出现低值区,对地震预测具有一定的指示意义。
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| 关 键 词： | 内蒙古中西部 振幅比 震源机制解 波形数据 地震预测 |
FOCAL MECHANISM ANALYSIS OF SMALL EARTHQUAKE IN CENTRAL AND WESTERN INNER MONGOLIA |
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| Liu Fang,Wang Xiaoshan,Yang Yaqiong.FOCAL MECHANISM ANALYSIS OF SMALL EARTHQUAKE IN CENTRAL AND WESTERN INNER MONGOLIA[J].Journal of Geodesy and Geodynamics,2010,30(Z1). |
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| Authors: | Liu Fang Wang Xiaoshan Yang Yaqiong |
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| Institution: | Liu Fang1),Wang Xiaoshan2) , Yang Yaqiong2)(1) Earthquake Administration of Inner Mongolia Autonomous Region,Hohhot 0100102) Earthquake Administration of Hebei Province,Shijiazhuang 050021) |
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| Abstract: | Using the method of the maximum amplitude ratio between P and S to inverse the focal mechanisms of small and medium earthquakes,and by using the digital waveform data of the small and medium earthquake occurred in the central and western Inner Mongolia from 2001 to 2008,130 focal mechanisms were obtained.The results show that there are two groups of nodal plane in NWW-SEE and NE-SW.From the effect of the compressive stress in NEE-SWW direction and the tensile stress in NNW-SSE direction,the NWW-SEE break si... |
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| Keywords: | central and western Inner Mongolia amplitude ratio focal mechanism waveform data earthquake prediction |
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