| 小江断裂中段及其邻近地区应力场时间变化分析 |
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| 引用本文： | 林向东,徐平,葛洪魁,武敏捷,武安绪.小江断裂中段及其邻近地区应力场时间变化分析[J].地震学报,2011,33(6):755-762. |
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| 作者姓名： | 林向东 徐平 葛洪魁 武敏捷 武安绪 |
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| 作者单位： | 1）中国北京100081中国地震局地球物理研究所2) 中国北京100080 北京市地震局 |
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| 基金项目： | “十一五”国家科技支撑项目“构造变形动力过程的野外观测与物理解释(2006BAC01B03-03-01)”资助; 中国地震局地球物理研究所论著11AC1017 |
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| 摘 要： | 研究地壳构造应力状态及其时空分布特征,特别是应力变化的信息,是探讨地震成因、分析发震条件的重要有效途径之一.本文利用1998年1月至2009年1月以来小江断裂中段及其邻区ML≥2.5的共计740个震源机制解,基于小江断裂中段及其邻近地区地质构造背景,对研究区进行了分区；以该区域内较大地震为界,结合余震时间序列特征,进行...
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| 关 键 词： | 小江断裂中段 震源机制解 应力场变化 |
Possible crustal stress change in middle section of Xiaojiang fault and its adjacent area |
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| Lin Xiangdong,Xu Ping,Ge Hongkui,Wu Minjie,Wu Anxu.Possible crustal stress change in middle section of Xiaojiang fault and its adjacent area[J].Acta Seismologica Sinica,2011,33(6):755-762. |
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| Authors: | Lin Xiangdong Xu Ping Ge Hongkui Wu Minjie Wu Anxu |
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| Affiliation: | 1) Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2) Earthquake Administration of Beijing Municipality, Beijing 100080, China |
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| Abstract: | The study on temporal and spatial crustal stress change is important for exploring earthquake origin and seismogenic condition. Based on 740 focal mechanism solutions of MLge;2.5 earthquakes occurred during Jan. 1998 to Jan. 2009 in middle Xiaojiang fault and its adjacent area, the studied region was divided into sub-regions, and temporally further divided into phases with the larger earthquakes as boundary of the sub-regions. After removal of the larger earthquakes this paper inverted the focal mechanism data with the method of Gephart for the stress in main phase of each sub-region. The result indicates that the azimuth of maximum principal stress sigma;1 in 4 temporal phases of the sub-region A is approximately NNW-SSE, and in northern part of sub-region B are approximately NNW-SSE，NNW-SSE and NNW-SSE. The azimuth of sigma;1 in southern part of sub-region B is approximately NNW-SSE. The azimuth of sigma;1 in northern part of sub-region B changed significantly, while the azimuth of sigma;1 in sub-region A is relatively stable. This result may be related to the complicated structure and possible stress adjusting in northern sub-region B.The sigma;1 directions in sub-region A may indicate seismically relative stability of the central Yunnan crustal block. |
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| Keywords: | middle section of Xiaojiang fault focal mechanism stress change |
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