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Frequency dependent Lg attenuation in south-central Alaska

Geophysical Research Letters

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DOI: 10.1029/2000GL011732

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Abstract

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) = Q0fη = 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 Lg Q(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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Frequency dependent Lg attenuation in south-central Alaska
Series title:
Geophysical Research Letters
DOI:
10.1029/2000GL011732
Volume
27
Issue:
23
Year Published:
2000
Language:
English
Description:
4 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
3949
Last page:
3952