Surface waves from the 2017 M w 8.2 Tehuantepec earthquake remotely triggered tectonic tremors in the Jalisco region, approximately 1000 km WNW in the northern Mexican subduction zone. This is the first observation of tremor triggering in this region and one of the largest known examples of a triggered tremor in the world. Although prior studies have found tectonic tremors triggered by teleseismic waves in subduction zones and plate boundaries, further investigation of tremor triggering is crucially important for understanding the causative mechanism. We calculate the stress and strain changes across the three-dimensional plate interface attributable to seismic waves from the earthquake by full wavefield simulation. The maximum magnitude of the dynamic strain tensor eigenvalues on the plate interface, where tremors likely occur, is approximately 10 –6 . The subducting slab geometry effectively amplifies triggering waves. The triggering Coulomb failure stress changes resolved for a thrust fault plane consistent with the geometry are estimated to be approximately 10–40 kPa. The relationship between the triggering stress and triggered tremor amplitude may indicate that the aσ of the rate–state-dependent friction law is 10–100 kPa.

中文翻译：

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2017 年 Mw8.2 特万特佩克地震远程触发的墨西哥北部俯冲带的构造震颤

2017 年 M w 8.2 特万特佩克地震的表面波远程触发了哈利斯科地区的构造震颤，该地区位于墨西哥北部俯冲带西北约 1000 公里处。这是该地区首次观察到触发震颤，也是世界上已知最大的触发震颤示例之一。尽管先前的研究已经发现俯冲带和板块边界的远震波触发了构造震颤，但进一步研究震颤触发对于理解其成因机制至关重要。我们通过全波场模拟计算了由地震产生的地震波引起的整个三维板块界面的应力和应变变化。板块界面上动态应变张量特征值的最大幅度，可能发生震颤，大约是 10 –6 。俯冲板片的几何形状有效地放大了触发波。与几何形状一致的推力断层的触发库仑破坏应力变化估计约为 10-40 kPa。触发应力与触发震颤幅度之间的关系可能表明速率-状态相关摩擦定律的 aσ 为 10-100 kPa。