| 2008年新疆于田MS7.3地震对后续 地震的完全库仑应力触发作用 |
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| 引用本文： | 冀战波,王琼,王海涛,解朝娣.2008年新疆于田MS7.3地震对后续 地震的完全库仑应力触发作用[J].地震学报,2014,36(6):997-1009. |
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| 作者姓名： | 冀战波 王琼 王海涛 解朝娣 |
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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 |
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| 基金项目： | 地震科技星火计划项目，新疆地震科学基金(201303)联合资助． |
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| 摘 要： | 在离散波数法基础上计算2008年3月21日新疆于田MS7.3地震造成的近场区域完全库仑应力变化， 分析该变化对余震发生所产生的影响， 得到了此次地震在2008年10月5日乌恰MS6.8地震震中处所产生的动态库仑破裂应力变化. 计算结果表明, 该地震近场区域库仑应力变化图像演化大概持续了60 s， 库仑应力变化对余震的触发率达到90%以上， 其中动态库仑应力变化图像更好地解释了余震的分布. 余震震中处的完全库仑应力变化计算结果表明， 其动态库仑应力变化远远大于静态库仑应力变化. 于田MS7.3地震在乌恰MS6.8地震震中处造成的最大动态库仑应力变化为0.12 MPa， 说明后者可能受到了于田MS7.3地震的动态应力触发作用， 但不显著；而静态库仑应力则对其影响很小.
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| 关 键 词： | 于田地震 完全库仑破裂应力变化 动态应力触发 静态应力触发 |
| 收稿时间： | 2014-02-23 |
Impact of complete Coulomb failure stress changes of the 2008 Xinjiang Yutian MS7.3 earthquake on the subsequent earthquakes |
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| Ji Zhanbo,Wang Qiong,Wang Haitao,Xie Chaodi.Impact of complete Coulomb failure stress changes of the 2008 Xinjiang Yutian MS7.3 earthquake on the subsequent earthquakes[J].Acta Seismologica Sinica,2014,36(6):997-1009. |
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| Authors: | Ji Zhanbo Wang Qiong Wang Haitao Xie Chaodi |
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| Institution: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2.School of Earth and Space Sciences, Peking University, Beijing 100871, China3.Earthquake Administration of Xinjiang Uygur Autonomous Region, Vrümqi 830011, China4.School of Resource Environment and Earth Science, Yunnan University, Kunming 650091, China |
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| Abstract: | Based on the discrete-wavenumber method, we calculated the complete Coulomb failure stress (CFS) changes of near-field region induced by 21 March 2008, Yutian, Xinjiang, MS7.3 earthquake, and analyzed their impact on the aftershocks. We also get the dynamic CFS changes of the Yutian earthquake produced at the epicentral location of the Wuqia MS6.8 earthquake on 5 October 2008. The calculated results show that the evolution of CFS change patterns lasted for almost 60 s, and trigger ratio of aftershocks by the main shock is above 90%. Dynamic CFS change patterns can better explain the distribution of aftershocks. Complete CFS changes results of aftershocks indicate that the dynamic CFS changes are far greater than static ones. The maximum dynamic CFS change at the epicenter of Wuqia earthquake is 0.12 MPa, suggesting that the Wuqia event may be triggered by dynamic Coulomb stresses induced by the Yutian event, but the triggering effect is unremarkable and static CFS changes have little influence on it. |
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| Keywords: | Yutian earthquake complete Coulomb failure stress change dynamic stress triggering static stress triggering |
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