Low-frequency submarine volcanic swarms at the southwestern end of the Okinawa Trough

C. H. Lin, L. W. Hsu, M. Y. Ho, T. C. Shin, K. J. Chen, Y. H. Yeh

Research output: Contribution to journalArticle

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Abstract

A low-frequency (LF) submarine volcanic swarm has been first observed at the southwestern end of the Okinawa Trough where some submarine volcanoes have recently been identified. A swarm of more than 24 earthquakes was recorded at land seismic stations in Taiwan between September 1st and September 4th, 2006. These earthquakes without clear S-arrivals were substantially different from other abundant tectonic earthquakes in the area. The dominant frequency of around 1 or 2 Hz recorded at all stations shows that the LF seismograms were generated by neither path nor site effects, but directly from the source. These LF earthquakes can be characterized as B-type volcanic earthquakes, which have been observed in some active volcanoes before significant eruptions. The observations of these LF volcanic earthquakes beneath submarine volcanic cones and seamounts are strong indicator that some submarine volcanoes are still active at the southwestern end of the Okinawa Trough.

Original languageEnglish
Article numberL06310
JournalGeophysical Research Letters
Volume34
Issue number6
DOIs
Publication statusPublished - 2007 Mar 28

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troughs
volcanology
trough
earthquakes
volcanic earthquake
submarine volcano
low frequencies
earthquake
volcanoes
site effect
seismogram
stations
seamount
seamounts
volcano
volcanic eruption
seismograms
Taiwan
volcanic eruptions
tectonics

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Low-frequency submarine volcanic swarms at the southwestern end of the Okinawa Trough. / Lin, C. H.; Hsu, L. W.; Ho, M. Y.; Shin, T. C.; Chen, K. J.; Yeh, Y. H.

In: Geophysical Research Letters, Vol. 34, No. 6, L06310, 28.03.2007.

Research output: Contribution to journalArticle

Lin, C. H. ; Hsu, L. W. ; Ho, M. Y. ; Shin, T. C. ; Chen, K. J. ; Yeh, Y. H. / Low-frequency submarine volcanic swarms at the southwestern end of the Okinawa Trough. In: Geophysical Research Letters. 2007 ; Vol. 34, No. 6.
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