論文

査読有り
2011年4月

Volcanic-like low-frequency earthquakes beneath Osaka Bay in the absence of a volcano

GEOPHYSICAL RESEARCH LETTERS
  • Naofumi Aso
  • ,
  • Kazuaki Ohta
  • ,
  • Satoshi Ide

38
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1029/2011GL046935
出版者・発行元
AMER GEOPHYSICAL UNION

Among the many deep low-frequency earthquakes (LFEs) recently discovered worldwide, LFEs beneath Osaka Bay, western Japan, are especially unusual. Their waveforms are monochromatic, resembling those of some volcanic LFEs, but there are no active volcanoes around. The area is close to but clearly distinct from a belt of tectonic LFEs, and is near the site of a large inland earthquake (the 1995 Kobe earthquake). To characterize the activity of these LFEs, we present an extensive catalog constructed using a matched filter analysis on continuous seismic records with template LFEs determined by the Japan Meteorological Agency. The relocated catalog of 1378 events over a period of 5 years shows spatially concentrated activity in two volumetric zones, with several active periods including successive tremor-like events. The magnitude-frequency statistics satisfy the Gutenberg-Richter law with a b-value of 2. Unlike tectonic LFEs, which are highly sensitive to tidal stress, the LFEs beneath Osaka Bay show no spectral peak in activity at tidal periods, and the overall pattern of the spectrum is similar to that of volcanic LFEs beneath Sakurajima, Japan. These findings suggest that the Osaka Bay LFEs are almost same as volcanic LFEs in origin, or at least related to fluid upwelling from the mantle. Citation: Aso, N., K. Ohta, and S. Ide (2011), Volcanic-like low-frequency earthquakes beneath Osaka Bay in the absence of a volcano, Geophys. Res. Lett., 38, L08303, doi:10.1029/2011GL046935.

Web of Science ® 被引用回数 : 15

リンク情報
DOI
https://doi.org/10.1029/2011GL046935
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000289854500008&DestApp=WOS_CPL
URL
http://orcid.org/0000-0001-6255-7494
ID情報
  • DOI : 10.1029/2011GL046935
  • ISSN : 0094-8276
  • ORCIDのPut Code : 21526169
  • Web of Science ID : WOS:000289854500008

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