Rp. Dziak, Empirical relationship of T-wave energy and fault parameters of northeast Pacific Ocean earthquakes, GEOPHYS R L, 28(13), 2001, pp. 2537-2540
h total of 179 northeast Pacific Ocean earthquakes that occurred between 19
92-1998 are used to investigate the relationship of T-wave acoustic energy
and earthquake fault parameters. The moderate-sized (3.7 less than or equal
to M-w less than or equal to 6.9) earthquakes were recorded by ocean hydro
phones and had their source parameters estimated by land-based seismic netw
orks. The acoustic energy release at the seafloor-water interface of each e
arthquake was estimated by removing the signal attenuation along the propag
ation path and instrument gain from the hydrophone signal. There appears to
be a relationship where, for a given magnitude earthquake, T-wave energy i
s 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 observa
tions suggest fault parameter information is contained within the T-wave si
gnal packet.