Classification of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand
Classification of long-term very long period (VLP) volcanic earthquakes at Whakaari/White Island volcano, New Zealand
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新西兰法卡里/怀特岛火山长期超长周期 (VLP) 火山地震的分类
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发表时间：
2020
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影响因子：
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通讯作者：
B. Kennedy
中科院分区：
文献类型：
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作者：
Iseul Park;A. Jolly;I. Lokmer;B. Kennedy
2007年至2019年底，我们在新西兰Whakaari/白色岛火山观测到了极长周期地震（VLP）。地震波形之间具有相似性，这表明重复的震源位置和过程。在两个永久站记录的VLPs检测使用波形语义，然后分为两个主要的家庭（F1和F2）使用聚类分析。这两个家族的特征是“镜像”反向波形极性，这表明它们在遗传上是相关的，但发生在火山活动的不同演化阶段。F1事件发生在整个观测期间，而F2事件主要发生在标志着火山动荡开始的群。一个详细的聚类分析揭示了可能的子家庭意味着轻微的时间演变在一个家庭。我们的研究结果增加了我们对Whakaari/白色岛火山岩浆热液系统的了解，表明可以利用相对稳定的VLP来源来改善对未来动荡的监测。
We have observed very long period earthquakes (VLPs) over the period 2007 to the end of 2019 at Whakaari/White Island volcano, New Zealand. The earthquakes exhibit similitude between waveforms which suggests repeating source locations and processes. VLPs recorded at two permanent stations were detected using waveform semblance and were then classified into two main families (F1 and F2) using a clustering analysis. The two families are characterized by ‘mirror image’ reverse waveform polarity suggesting that they are genetically related, but occur during different evolutionary phases of volcanic activity. F1 events occurred throughout the observation period, while F2 events mainly occurred as swarms that mark the onset of volcanic unrest. A detailed cluster analysis reveals possible sub-families implying slight temporal evolutions within a family. Our results add to our understanding of the volcanic magma–hydrothermal system at Whakaari/White Island indicating that relatively stable VLP sources may be exploited to improve monitoring for future unrest.