Investigating Triggering of the Aftershocks of the 2014 Napa Earthquake
Investigating Triggering of the Aftershocks of the 2014 Napa Earthquake
复制标题
调查 2014 年纳帕地震余震的触发因素
DOI：
10.1785/0120160011
复制
发表时间：
2016
影响因子：
3
通讯作者：
A. Emolo
中科院分区：
文献类型：
--
作者：
V. Convertito;R. D. Matteis;A. Emolo
摘要2014年8月24日当地时间凌晨03：20，加州南纳帕发生MW 6. 0地震，引发了地震学界对这种中等震级地震的破坏程度以及致灾断层的几何形状和方向的讨论。此外，库仑静态应力变化图似乎不能完全解释近源余震分布。在这里，我们从峰值地震动的空间分布分析中找到了北-西北震源方向性的明确证据。考虑断层范围和震源方向性计算的估计峰值动态应变场的最高值区域与近源余震分布一致。这可能表明，除了库仑静态应力变化外，动态应变也有助于触发近源纳帕地震余震。本文所用的方法对识别可能发生余震的地区可能是有用的。
Abstract The occurrence of the M w 6.0 South Napa California earthquake, on 24 August 2014 at 03:20 a.m. local time, triggered discussion in the seismological community about the level of damage associated with such a moderate‐magnitude event and about the geometry and orientation of the causative fault. In addition, coulomb static stress change mapping does not seem to be able to fully explain near‐source aftershock distribution. Here, we find clear evidence of a north‐northwest source directivity from the analysis of the spatial distribution of peak ground motion. The area of the highest values of the estimated peak dynamic strain field, computed accounting for fault extent and source directivity, agrees with the near‐source aftershock distribution. This might suggest that, in addition to coulomb static stress change, dynamic strain also contributed to the triggering of near‐source Napa earthquake aftershocks. The approach used here might be useful to identify areas likely prone to aftershock occurrence.
影响因子：
64.8
作者：
Richards-Dinger, Keith;Stein, Ross S.;Toda, Shinji
通讯作者：
Toda, Shinji