Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3510305i&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 10, CiteID L10305
Physics
23
Seismology: Earthquake Source Observations (1240), Seismology: Earthquake Dynamics (1242), Seismology: Subduction Zones (1207, 1219, 1240)
Scientific paper
Recently observed unusual seismic events: deep low frequency earthquakes and tremor, very low frequency earthquakes, and slow slip events form a family of slow earthquakes that are governed by a scaling law different from ordinary earthquakes. Guided by this scaling law, we have observed previously unknown events, with source duration of 20-200 s and moment magnitude of 3-4, under the Kii Peninsula in western Japan. These events radiate seismic energy in the 2-8 Hz band in direct proportion to their seismic moment-rate, though the constant of proportionality is 4-5 orders of magnitude smaller than for ordinary earthquakes. Slow earthquakes in this region may be comprised of numerous shear slip events, which in aggregate are manifest seismically as tremor or isolated longer events up to 200 s and geodetically as slow slip events.
Beroza Gregory C.
Ide Satoshi
Imanishi Kazutoshi
Shelly David R.
Yoshida Yasuhiro
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