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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 114,
B00A11,
10 PP., 2009
doi:10.1029/2008JB006044
Source duration of deep very low frequency earthquakes in western Shikoku, Japan
National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan
National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan
National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan
Center for Integrated Disaster Information Research, Interfaculty Initiative in Information Studies, University of Tokyo, Tokyo, Japan
The source durations of very low frequency earthquakes in western Shikoku, Japan were estimated. Nineteen very low frequency earthquakes were located in this region between 14 and 17 March 2007 that migrated southward with tremor activity. The source durations of four Mw 3.5–3.8 very low frequency earthquakes were estimated by comparing simulated and observed seismograms to be 12–18 s. The ratio of seismic moment and source duration is 1–5 × 1013 Nm/s. This value is several to ten times larger than those in southern Kii, Japan. Such a ratio difference may reflect the nature of very low frequency earthquake between these regions. If a stress drop of 0.003–3 MPa is assumed, then the slip propagation velocity of very low frequency earthquakes ranges from several tens to several hundreds of m/s.
Received 29 August 2008; accepted 5 August 2009; published 18 November 2009.
Citation: (2009), Source duration of deep very low frequency earthquakes in western Shikoku, Japan, J. Geophys. Res., 114, B00A11, doi:10.1029/2008JB006044.
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