| 汶川M_S 8.0地震库仑破裂应力变化及断层危险性初步研究 |
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| 引用本文： | 张国宏,单新建,李卫东.汶川M_S 8.0地震库仑破裂应力变化及断层危险性初步研究[J].地震地质,2008,30(4):935-944. |
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| 作者姓名： | 张国宏 单新建 李卫东 |
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| 作者单位： | 1. 中国地震局地质研究所,地震动力学国家重点实验室,北京,100029
2. 河南工业大学空间信息研究所,郑州,450001 |
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| 基金项目： | “十一五”国家科技支撑计划(2006BAC01B030103);国家自然科学基金(40574007);中国地震局汶川8.0级地震科学考察项目共同资助 |
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| 摘 要： | 利用四川省汶川MS8.0地震的震源机制解及滑动分布模型,反演了由汶川地震造成的同震库仑破裂应力变化;从余震效应与断层相互作用的角度对库仑破裂应力变化进行了分析。结果显示:基于滑动分布模型反演的库仑破裂应力变化能较好地反映与余震分布的对应关系,以最大余震断层面参数(走向/倾角/滑动角:204°/56°/98°)为接收断层,反演结果最佳,83%M>4的余震均发生于库仑应力增加约0.01MPa的区域;库仑破裂应力变化的主要特征为断层北盘大部分区域为库仑破裂应力下降区,断层南盘主要为增加区,断层两端均显示库仑破裂应力变化增加,且分别沿NE和SW两个方向发展。最后,基于活断层分布模型,计算由此次地震造成的已存断层面上的库仑破裂应力变化,结果显示多条左旋走滑断裂库仑破裂应力变化值增加
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| 关 键 词： | 滑动分布 汶川M_S 8.0地震 库仑破裂应力变化 断层相互作用 |
| 收稿时间： | 2008-12-18 |
THE COULOMB FAILURE STRESS CHANGE ASSOCIATED WITH THE MS8.0 WENCHUAN EARTHQUAKE AND THE RISK PREDICTION OF ITS SURROUNDING FAULTS |
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| ZHANG Guo-hong,SHAN Xin-jian,LI Wei-dong.THE COULOMB FAILURE STRESS CHANGE ASSOCIATED WITH THE MS8.0 WENCHUAN EARTHQUAKE AND THE RISK PREDICTION OF ITS SURROUNDING FAULTS[J].Seismology and Geology,2008,30(4):935-944. |
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| Authors: | ZHANG Guo-hong SHAN Xin-jian LI Wei-dong |
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| Abstract: | Using the focal mechanisms and slip distribution model of the MS8.0 Wenchuan earthquake,we inverted the co-seismic Coulomb failure stress change.The inverted Coulomb stress change based on Chen J s slip distribution model shows that about 83%of its aftershocks lie in regions where the Coulomb stress increased by 0.01MPa,given the receiver fault strike/dip/rake as 204°/56°/98° respectively.In contrast,the distribution of aftershocks is sparse in areas where the inverted Coulomb stress change is decreased by |
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| Keywords: | slip distribution the M_S 8 0 Wenchuan earthquake Coulomb failure stress change fault interaction |
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