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A cascading failure during the 24 May 2013 great Okhotsk deep earthquake

机译:2013年5月24日鄂霍次克大地震中的级联故障

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On 24 May 2013, the largest ever-recorded deep earthquake occurred beneath Sea of Okhotsk. A multiple point source inversion procedure is applied to constrain source process of this earthquake, based on waveform modeling of both direct P and SH waves and near-surface reflected pP and sSH waves. Our results indicate that the earthquake consists of sixmajor subevents separated in space and time, encompassing a horizontal dimension of 64 ± 4 km along ~ N160°E and a downward depth extension of 35 ± 4 km. The geographic distribution and focal mechanisms of the inferred subevents and foreshock/aftershock locations do not fit into plane rupture. We suggest that the earthquake can be best explained by a cascading failure of shear instability within preexisting weak zones in the region, with the perturbation of stress generated by a shear instability triggering another.
机译:2013年5月24日,鄂霍次克海下方发生了有史以来最大的深度地震。基于直接P波和SH波以及近地表反射pP和sSH波的波形建模,将多点源反演程序应用于该地震的震源过程。我们的结果表明,地震由六个主要子事件组成,这些子事件在时间和空间上是分开的,沿着〜N160°E的水平尺度为64±4 km,向下延伸的深度为35±4 km。推断的子事件和前震/余震位置的地理分布和震源机制不适合飞机破裂。我们认为,该地震可以用该地区先前存在的薄弱区域内的一系列剪切不稳定性级联破坏来最好地解释,而剪切不稳定性所产生的应力扰动又会触发另一个。

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