Repeating Infrasound From an Earthquake Doublet in Alaska

Repeating Infrasound From an Earthquake Doublet in Alaska
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阿拉斯加地震双峰重复次声波

DOI:
10.1029/2021gl094632
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发表时间:
2021-09
影响因子:
5.2
通讯作者:
Shi Jing
Shi Jing
中科院分区:
地球科学1区
文献类型:
--
作者:
Yang Minghan;Wang Tao;Shi Jing

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地震次声包含有关地下介质和震源的信息。我们确定了三种类型的重复次声:阿拉斯加连续两次Mw6.2地震(相隔2小时和10公里)产生的局部次声、次声和震中次声。对于两组重复的次声,路径效应是相同的,这让我们可以专注于耦合机制。我们利用阵列I53和各个阵列台站的声学和地震记录,计算了两次地震之间的相对功率谱密度变化。在0.9-2.1赫兹频段,我们发现地震能量被有效地转化为声能。此外,我们还发现了地震和绕射次声能量的相似空间分布,这表明不同的震源机制对次声观测的影响。这项研究揭示了地震次声的产生机制,并展示了监测次声以约束震源性质的潜力。
Earthquake infrasound contains information concerning the underground media and the earthquake source. We identify three types of repeating infrasound: local, secondary, and epicentral infrasound from two successive Mw6.2 earthquakes (separated by <2 h and <10 km) in Alaska. The path effects are the same for the two sets of repeating infrasound, letting us focus on the coupling mechanism. We calculate the relative power spectral density change between the two events using acoustic and seismic records from array I53 and individual USArray stations. In the 0.9–2.1 Hz band, we find that seismic energy is converted efficiently into acoustic energy. In addition, we identify similar spatial distributions of the seismic and diffracted infrasonic energies, which indicate the influence of different earthquake focal mechanisms on the infrasound observations. This study sheds light on the generation mechanism of earthquake infrasound and demonstrates the potential for monitoring infrasound to constrain earthquake source properties.
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