Mainshock‐Aftershock Clustering in Volcanic Regions
Mainshock‐Aftershock Clustering in Volcanic Regions
复制标题
火山区主震余震群
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
S. Prejean
中科院分区：
文献类型：
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作者：
Ricardo Garza‐Girón;E. Brodsky;S. Prejean
地震通过两种类型的地震爆发打破了它们一般的泊松行为：震群和主震-余震序列。前者通常被认为在火山和地热地区占主导地位，但余震的产生，包括在群内，在火山地区没有得到很好的研究。在这里，我们比较了日本活跃火山区和附近非火山区的主震-余震集群。我们发现，余震的产生在两个地区是相似的两个单独的度量：（1）火山和非火山地区有类似的面积，集群成主震-余震序列的比例。(2)具有主震-余震序列的火山区的余震发生率至少与非火山区一样高。我们还发现，火山构造事件是火山喷发的前兆，在没有主震-余震群的火山中比在有明确的主震-余震群的火山中更常见。最后一个发现暗示了一种识别火山系统的策略，在这种系统中，编目地震是很好的行为预测器。
Earthquakes break their general Poissonean behavior through two types of seismic bursts: swarms and mainshock‐aftershock sequences. The former is commonly thought to dominate in volcanic and geothermal regions, but aftershock production, including within swarms, is not well studied in volcanic regions. Here we compare mainshock‐aftershock clustering in active volcanic regions in Japan to nearby nonvolcanic regions. We find that aftershock production is similar in both areas by two separate metrics: (1) Both volcanic and nonvolcanic regions have similar proportions of areas that cluster into mainshock‐aftershock sequences. (2) Volcanic areas with mainshock‐aftershock sequences have aftershock productivity at least as high as nonvolcanic regions. We also find that volcano‐tectonic events that are precursors to an eruption are more common at volcanoes without mainshock‐aftershock clusters than at volcanoes with well‐defined mainshock‐aftershock clusters. This last finding hints at a strategy to identify volcanic systems where cataloged earthquakes are good predictors of behavior.