Frequency dependent Lg attenuation in south-central Alaska
Geophysical Research Letters
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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.
| 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 |
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