Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2537d&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 13, p. 2537-2540
Physics
15
Oceanography: General: Ocean Acoustics, Seismology: Earthquake Parameters, Seismology: Oceanic Crust, Seismology: Seismicity And Seismotectonics
Scientific paper
A total of 179 northeast Pacific Ocean earthquakes that occurred between 1992-1998 are used to investigate the relationship of T-wave acoustic energy and earthquake fault parameters. The moderate-sized (3.7<=Mw<=6.9) earthquakes were recorded by ocean hydrophones and had their source parameters estimated by land-based seismic networks. The acoustic energy release at the seafloor-water interface of each earthquake was estimated by removing the signal attenuation along the propagation path and instrument gain from the hydrophone signal. There appears to be a relationship where, for a given magnitude earthquake, T-wave energy is lower for normal and reverse fault earthquakes than strike-slip events. A more detailed comparison indicates acoustic energy of the earthquake will often decrease as the component of dip-slip motion increases. These observations suggest fault parameter information is contained within the T-wave signal packet.
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