論文

査読有り
2013年7月17日

Tectonic, volcanic, and semi-volcanic deep low-frequency earthquakes in western Japan

Tectonophysics
  • Naofumi Aso
  • ,
  • Kazuaki Ohta
  • ,
  • Satoshi Ide

600
開始ページ
27
終了ページ
40
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.tecto.2012.12.015

In western Japan, relatively small (. M<. 2) deep low-frequency earthquakes (LFEs) occur at around 30. km depth, radiating seismic waves mainly in the frequency band of 2-8. Hz. The LFEs are categorized into three types based on their locations: tectonic LFEs on plate boundaries, volcanic LFEs beneath active volcanoes, and isolated intraplate LFEs located far from either plate boundaries or active volcanoes. Despite our lack of understanding of the LFEs, their spatial distributions suggest that tectonic, volcanic, and isolated intraplate LFEs are physically related to interplate megathrust earthquakes, volcanic eruptions, and large inland earthquakes, respectively.The present paper characterizes the seismicity of the three types of LFEs in five regions based on a more complete catalog, thanks to automated event detection and precise relocation using waveform correlation. The results show that isolated intraplate LFEs are more similar to volcanic LFEs than to tectonic LFEs. The volcanic and isolated intraplate LFEs are insensitive to tidal stress, are characterized by power-law magnitude frequency statistics such as the Gutenberg-Richter relation, and are distributed mainly in small vertical clusters, while the tectonic LFEs are modulated by tidal stress, are limited in size, and are distributed along the plate boundary. Hence, we propose that isolated intraplate LFEs should be named "semi-volcanic" LFEs. Since tectonic LFEs and volcanic LFEs are thought to be related to the fluid existence and fluid movements, respectively, isolated intraplate (semi-volcanic) LFEs may be related to crustal fluid movements in the source area. © 2012 Elsevier B.V.

Web of Science ® 被引用回数 : 35

リンク情報
DOI
https://doi.org/10.1016/j.tecto.2012.12.015
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000322501400004&DestApp=WOS_CPL
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84879798205&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84879798205&origin=inward
URL
http://orcid.org/0000-0001-6255-7494
ID情報
  • DOI : 10.1016/j.tecto.2012.12.015
  • ISSN : 0040-1951
  • ORCIDのPut Code : 21526168
  • SCOPUS ID : 84879798205
  • Web of Science ID : WOS:000322501400004

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