Assessing the role of stress transfer on aftershock locations

Assessing the role of stress transfer on aftershock locations
复制标题

评估余震地点应力传递的作用

DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
E. Papadimitriou
E. Papadimitriou
中科院分区：
--
文献类型：
--
作者：
S. Lasocki;V. Karakostas;E. Papadimitriou

文献摘要

被引文献

相似文献

[1]研究了1995年5月13日希腊Kozani-Grevena 6.5级地震引起的静应力变化对余震位置的影响。一个三断层破裂模型的主震，余震搬迁，和断层面的解决方案的余震是可用的。我们已经开发了一种测试方法，该方法测试如果主震引起的应力变化对余震位置没有影响，那么位于由静态应力变化的选定标准确定的区域内的余震比例是否可以达到。在每次余震的震源处确定应力变化的区域。对于由大于或等于0.1、0.3、1.0、5.0和10.0 bar的正应力变化和小于或等于− 0.1、− 0.3、− 1.0、− 5.0和− 10.0 bar的负应力变化定义的区域，分别进行分析。测试已经自信地表明，在正静态应力变化的区域内定位余震的概率增加，这支持了关于这些区域触发效应的假设。分析没有证明在较大负应力变化的区域内存在应力阴影。相反，试验表明，在变化小于或等于-5.0巴和-10.0巴的区域，事件发生的概率显著增加。对于绝对应力变化较大的区域，无论变化的符号如何，这种概率都会增加，尽管在正变化区域比负变化区域明显更多。
[1] The influence of the static stress changes caused by the Mw 6.5 Kozani-Grevena (Greece) earthquake of 13 May 1995 on aftershock locations is investigated. A three-fault rupture model for the main shock, aftershock relocations, and fault plane solutions for the aftershocks is available. We have developed a testing method, which tests whether the proportions of aftershocks located inside areas determined by a selected criterion on the static stress change could be attained if there were no effect of the stress change due to the main shock on aftershock locations. The areas of stress change are determined at the focus of every aftershock. The analysis is performed separately for areas defined by a positive stress change greater than or equal to 0.1, 0.3, 1.0, 5.0, and 10.0 bar and by a negative change less than or equal to −0.1, −0.3, −1.0, −5.0, and −10.0 bar. The tests have confidently indicated a rise in probability to locate aftershocks inside areas of positive static stress change, which supports the hypothesis on the triggering effect in these areas. The analysis has not evidenced the existence of stress shadows inside areas of larger negative stress change. On the contrary, the tests have indicated a significant increase of the probability of event location in the areas of a change less than or equal to −5.0 and −10.0 bar. For areas of larger absolute stress change this probability increases regardless of the sign of the change though distinctly more in areas of positive than of negative change.