Physics
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3706311t&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 6, CiteID L06311
Physics
1
Ionosphere: Midlatitude Ionosphere, Ionosphere: Ionospheric Dynamics, Ionosphere: Active Experiments, Ionosphere: Equatorial Ionosphere
Scientific paper
We have conducted a temporal broadband seismic observation in Kii Peninsula, southwest Japan, and detected a swarm of 110 very low frequency earthquakes (VLFs) and deep low frequency tremors. During three days of the swarm activity, VLFs and tremors occur concurrently in two localized regions separated by ˜10 km. Stacking analyses are also employed to detect VLF signals of a period longer than 50 s, whose focal mechanisms are determined for the first time from data and shown to be consistent with the subducting plate motion. Evaluation of the VLF seismic moment implies that a substantial portion of the SSE seismic moment is released as a VLF swarm.
Idehara Koki
Iidaka Takashi
Iritani Ryohei
Kawakatsu Hitoshi
Miyakawa Koji
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