Frequency dependent Lg attenuation in south-central Alaska

Details Frequency dependent Lg attenuation in south-central Alaska Frequency dependent Lg attenuation in south-central Alaska

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3949m&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 23, p. 3949-3952

Physics

3

Seismology, Seismology: Continental Crust, Seismology: Earthquake Ground Motions And Engineering

Scientific paper

The characteristics of seismic energy attenuation are determined using high frequency Lg waves from 27 crustal earthquakes, in south-central Alaska. Lg time-domain amplitudes are measured in five pass-bands and inverted to determine a frequency-dependent quality factor, Q(f), model for south-central Alaska. The inversion in this study yields the frequency-dependent quality factor, in the form of a power law: Q(f)=Q0 fɛ=220(+/-30)f0.66(+/-0.09)(0.75<=f<=12Hz). The results from this study are remarkably consistent with frequency dependent quality factor estimates, using local S-wave coda, in south-central Alaska. The consistency between S-coda Q(f) and LgQ(f) enables constraints to be placed on the mechanism of crustal attenuation in south-central Alaska. For the range of frequencies considered in this study both scattering and intrinsic attenuation mechanisms likely play an equal role.

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