Applying the Coulomb failure function with an optimally oriented plane to the 2008 Mw 7.9 Wenchuan earthquake triggering
Applying the Coulomb failure function with an optimally oriented plane to the 2008 Mw 7.9 Wenchuan earthquake triggering
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将具有最优定向平面的库仑破坏函数应用于2008年Mw 7.9级汶川地震触发
DOI：
10.1016/j.tecto.2009.09.019
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发表时间：
2010-08
期刊：
影响因子：
2.9
通讯作者：
Wang, Jianjun
中科院分区：
文献类型：
--
作者：
Li, Zhenhong;Xu, Caijun;Drummond, Jane;Wang, Jianjun
库仑破坏函数（CFF）定量地描述了震源断层附近次级断层的静态应力变化。CFF可以用来监测静态应力如何转移，然后揭示在源断层周围发生连续事件的概率。在本文中，我们专注于CFF，特别是最佳定向平面。我们提出了一个统一的模型，以确定一个最佳取向的平面和相应的库仑应力，然后将该模型应用于2003年的Mw6.6巴姆（伊朗）地震和2008年Mw7.9汶川（中国）地震，从而检查其有效性。结果表明，2003年巴姆地震正库仑应力变化与余震的空间相关性在均匀平面上为47.06%，在最优深度方向上为87.53%; 2008年汶川地震正库仑应力变化与余震的空间相关性分别为45.68%和58.20%。建议在绘制库仑应力图分析地震触发效应时，应考虑最佳定向面。
The Coulomb failure function (CFF) quantitatively describes static stress changes in secondary faults near the source fault of an earthquake. CFF can be employed to monitor how static stress transfers and then shed some light on the probability of successive events occurring around a source fault. In this paper we focus on the CFF and particularly on optimally oriented planes. We present a unified model to determine an optimally oriented plane and its corresponding Coulomb stress, then apply the model to the 2003 Mw 6.6 Bam (Iran) earthquake and the 2008 Mw 7.9 Wenchuan (China) earthquake, thereby checking its effectiveness. Our results show that spatial correlation between positive Coulomb stress changes and aftershocks are, for the 2003 Bam earthquake, 47.06% when elastic Coulomb stress changes are resolved on uniform planes and 87.53% when these are resolved on optimally oriented planes at depth; for the 2008 Wenchuan earthquake the correlations are 45.68% and 58.20%, respectively. It is recommended that account be taken of optimally oriented planes when drawing a Coulomb stress map for analyzing earthquake triggering effects.
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