Scattering and anelastic attenuation of seismic energy in central and south-central Alaska

Details Scattering and anelastic attenuation of seismic energy in central and south-central Alaska Scattering and anelastic attenuation of seismic energy in central and south-central Alaska

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pepi...67..115m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 67, Issue 1-2, p. 115-122.

Physics

11

Scientific paper

The characteristics of seismic energy attenuation in central and south-central Alaska are described. The data analyzed are short-period seismograms of local earthquakes recorded digitally in 12 bit at 120-Hz sampling rate by permanent stations of the regional network in the study area. First, the coda amplitude decay rate was compared for two depth ranges, 0-22 km and 63-133 km, using the single-scattering model. The results show dependence of Qc-1 on earthquake focal depth in the frequency (f) interval of 1 < f < 16 Hz; the deeper events yield consistently lower values for Qc-1 than the shallower events, similar to the results obtained by others for the Kanto district in Japan and for the Hindu-Kush region in Afghanistan. Next, the data were analyzed to separate the effects of intrinsic and multiple scattering on total S-wave energy, by applying the method of Wu to the hypocentral distance dependence of total seismic energy obtained from local earthquakes, which were normalized to a common source by the coda method of Aki. The results show the presence of strong scattering effects-the values of scattering attenuation (Qs-1) are an order of magnitude greater than the intrinsic attenuation (Qi-1) with the extinction distance in the range of 20-23 km. We found that Qc-1 is about a half of Qs-1 for the above frequency range, but is much larger than Qi-1.

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