A model for the shape of the Fourier amplitude spectrum of acceleration at high frequencies
- Creators
- Anderson, John G.
- Hough, Susan E.
Abstract
At high frequencies f the spectrum of S-wave accelerations is characterized by a trend of exponential decay, e^(−πkf). In our study, the spectral decay parameter k shows little variation at a single station for multiple earthquakes at the same distances, but it increases gradually as the epicentral distance increases. For multiple recordings of the San Fernando earthquake, k increases slowly with distance, and k is systematically smaller for sites on rock than for sites on alluvium. Under the assumption that the Fourier spectrum of acceleration at the source is constant above the corner frequency (an ω^(−2) source model), the exponential decay is consistent with an attenuation model in which Q increases rapidly with depth in the shallow crustal layers.
Additional Information
© 1984 Seismological Society of America. Manuscript received 11 October 1983. K. Aki, J. E. Luco, O. W. Nuttli, and M. Reichle provided helpful critical reviews of this manuscript. We thank T. C. Hanks for calling our attention to the article by Berrill and Hanks, as well as for a thoughtful review of the manuscript. We also wish to acknowledge helpful discussions with J. N. Brune, T. H. Heaton, A. H. Olson, and D. M. Boore. P. Bodin provided much assistance in gathering information for this study. This research was supported by National Science Foundation Grant CEE 81-20096.Attached Files
Published - 1969.full.pdf
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Additional details
- Eprint ID
- 48694
- Resolver ID
- CaltechAUTHORS:20140819-145139853
- CEE 81-20096
- NSF
- Created
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2014-08-19Created from EPrint's datestamp field
- Updated
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2020-03-09Created from EPrint's last_modified field