2008年新疆于田M_S7.3地震对后续地震的完全库仑应力触发作用
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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60s,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.
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,MS7.3earthquake,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 MS6.8earthquake on 5October 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 earthquakeis0.12 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.
引文
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