Abstract

In this research the Coulomb stress changes due to earthquake sequence that began in the 1936 to 1997 earthquakes in Eastern Iran and their triggering effect on the rupturing of adjacent faults were investigated. Obtained results revealed a well triggering relation between main shocks and later events on the Dasht-e-Bayaz and Abiz faults, respectively. The calculated stress maps indicate that positive and negative zones of Coulomb stress changes with increasing lobes of 0.1‒1 bar are found in the off-faults tips, located at rupture terminates while the decreasing Coulomb stress lobes lie in the high angle relative to the rupture plane or relieve stress along the ruptures. Cross sections drawn respect to the source and received faults confirm the results. Also, the stress perturbations resulted from successive earthquakes and the spatial patterns of the following earthquake distribution have a good consistency. This correlation shows that the population of secondary faults and subsequent earthquakes can be encouraged in the future by coseismic Coulomb stress changes due to mainshock and background loading.

中文翻译：

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地震触发性评估：1968年8月30日伊朗东部达什特-e-巴亚兹地震（Mw = 7.1）后库仑静应力变化的见解

摘要

在这项研究中，研究了从1936年至1997年伊朗东部地震开始的地震序列引起的库仑应力变化及其对邻近断层破裂的触发作用。获得的结果表明，分别在达什特-e-巴耶兹和阿比斯断层上发生的主要地震与后来发生的事件之间具有良好的触发关系。计算得出的应力图表明，在断层尖端发现了库仑应力的正负变化区域，裂隙增加了0.1‒1 bar，位于破裂终止处，而库仑应力裂变相对于破裂处呈高角度沿着破裂平面或减轻应力。相对于源和接收到的故障绘制的横截面确认了结果。也，连续地震引起的应力扰动与后续地震分布的空间格局具有良好的一致性。这种相关性表明，由于主震和背景载荷引起的同震库仑应力变化，将来可以鼓励二次断裂和后续地震的发生。