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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Response of seismicity to Coulomb stress triggers and shadows of the 1999 Mw = 7.6 Chi-Chi, Taiwan, earthquake
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Response of seismicity to Coulomb stress triggers and shadows of the 1999 Mw = 7.6 Chi-Chi, Taiwan, earthquake

机译：地震对库仑应力触发和阴影的响应（1999 Mw = 7.6台湾台湾集集）

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The correlation between static Coulomb stress increases and aftershocks has thus far provided the strongest evidence that stress changes promote seismicity, a correlation that the Chi-Chi earthquake well exhibits. Several studies have deepened the argument by resolving stress changes on aftershock focal mechanisms, which removes the assumption that the aftershocks are optimally oriented for failure. Here one compares the percentage of planes on which failure is promoted after the main shock relative to the percentage beforehand. For Chi-Chi we find a 28% increase for thrust and an 18% increase for strike-slip mechanisms, commensurate with increases reported for other large main shocks. However, perhaps the chief criticism of static stress triggering is the difficulty in observing predicted seismicity rate decreases in the stress shadows, or sites of Coulomb stress decrease. Detection of sustained drops in seismicity rate demands a long catalog with a low magnitude of completeness and a high seismicity rate, conditions that are met at Chi-Chi. We find four lobes with statistically significant seismicity rate declines of 40–90% for 50 months, and they coincide with the stress shadows calculated for strike-slip faults, the dominant faulting mechanism. The rate drops are evident in uniform cell calculations, 100-month time series, and by visual inspection of the M ≥ 3 seismicity. An additional reason why detection of such declines has proven so rare emerges from this study: there is a widespread increase in seismicity rate during the first 3 months after Chi-Chi, and perhaps many other main shocks, that might be associated with a different mechanism.
机译：迄今为止，静态库仑应力增加与余震之间的相关性提供了最有力的证据，表明应力变化会促进地震活动，这是集集地震很好表现出来的一种相关性。多项研究通过解决余震震源机制上的应力变化，加深了争论，从而消除了余震针对故障进行最佳定向的假设。在此，比较了主震后导致故障的平面所占百分比与之前的百分比。对于Chi-Chi，我们发现推力增加了28％，走滑机构增加了18％，这与其他大型主要冲击的增加相称。但是，对静态应力触发的主要批评可能是难以观察到应力阴影中预测的地震活动率降低或库仑应力降低的位置。要检测地震活动率的持续下降，就需要很长的目录，而这些数据库的完整性程度低，地震活动率高，这是Chi-Chi所能满足的。我们发现四个波瓣在50个月内具有统计上显着的地震活动率下降40-90％，并且它们与为走滑断层（主要断层机制）计算的应力阴影重合。在统一的单元计算，100个月的时间序列以及通过目视检查M≥3的地震活动中，速率下降很明显。这项研究证明了如此下降的发现如此罕见的另一个原因是：在Chi-Chi之后的前三个月，地震活动率普遍上升，也许还有许多其他主要冲击，可能与不同的机理有关。

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