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Microearthquake spectra from the Anza, California, seismic network: site response and source scaling

Bulletin of the Seismological Society of America

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Abstract

We analyzed spectra of local microearthquakes recorded at the Anza, California, seismic network to isolate the effects of site response and to investigate the scaling of source parametrs for small earthquakes. Spectra of microearthquakes (M<2; Mo<1019 dyne-cm) at Anza have shapes characteristic of the receiver sites and are generally independent of the source region. Thus, the site response is a major conditioner of the observed spectral shape. To remove the effects of site response from the spectra of a M ~3 event and isolate its source spectrum, we divided by the spectra of an adjacent aftershock used as an empirical Green's function event. The spectral ratios display remarkable agreement between sites which showed vast differences in their original spectra, indicating that the spectral division effectively removed the site response. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Microearthquake spectra from the Anza, California, seismic network: site response and source scaling
Series title:
Bulletin of the Seismological Society of America
Volume
79
Issue:
3
Year Published:
1989
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
581
Last page:
609