Going Beyond Rate Changes as the Sole Indicator for Dynamic Triggering of Earthquakes
Going Beyond Rate Changes as the Sole Indicator for Dynamic Triggering of Earthquakes
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DOI：
10.1038/s41598-020-60988-2
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发表时间：
2020-03
影响因子：
4.6
通讯作者：
K. Pankow;D. Kilb
中科院分区：
文献类型：
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作者：
K. Pankow;D. Kilb
远程地震触发是一种众所周知的现象。触发通常是通过与地震能量传递同时发生的地震速率的统计显着增加来识别的。在建立速率变化时，通常使用短持续时间地震目录，并且通常不在背景地震活动的背景下分析触发序列。我们使用 500 次主震和美国西部 33 年的四个地震目录，比较了三种不同统计方法识别远程地震触发的能力。与许多先前的研究相反，我们发现远程动态触发很少见（保守地说，<2% 的时间）。对于与远程速率增加相关的主震，触发的空间和时间特征不同。我们发现，仅与主震能量同时发生的速率增加不足以得出动态触发发生的结论。为了对动态触发序列进行分类，我们建议放弃严格的统计测量，而是使用包括空间和时间指标等多个因素的兼容性评估。
Remote earthquake triggering is a well-established phenomenon. Triggering is commonly identified from statistically significant increases in earthquake rate coincident with the passage of seismic energy. In establishing rate changes, short duration earthquake catalogs are commonly used, and triggered sequences are not typically analyzed within the context of background seismic activity. Using 500 mainshocks and four western USA 33-yearlong earthquake catalogs, we compare the ability of three different statistical methods to identify remote earthquake triggering. Counter to many prior studies, we find remote dynamic triggering is rare (conservatively, <2% of the time). For the mainshocks associated with remote rate increases, the spatial and temporal signatures of triggering differ. We find that a rate increase coincident in time with mainshock energy alone is insufficient to conclude that dynamic triggering occurred. To classify dynamically triggered sequences, we suggest moving away from strict statistical measurements and instead use a compatibility assessment that includes multiple factors, like spatial and temporal indicators.