Repeating Infrasound From an Earthquake Doublet in Alaska
Repeating Infrasound From an Earthquake Doublet in Alaska
复制标题
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
中科院分区:
文献类型:
--
作者:
Yang Minghan;Wang Tao;Shi Jing
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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