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Bulletin of the Seismological Society of America; February 1976; v. 66; no. 1; p. 45-60
© 1976 Seismological Society of America
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Microtremor analysis of local geological conditions

LEWIS J. KATZ

SEISMIC EXPLORATION, INC., 250 E. BROADWAY, SUITE 330, SALT LAKE CITY, UTAH 84111

Abstract

The application of microtremor spectra in predicting frequency-dependent amplification effects of local site geology was investigated. Long time-interval (> 45 min) microtremor data were used to estimate Power Spectral Density (PSD) plots. Peaks occurring in these PSD plots were correlated with peaks of transfer functions (Haskell, 1960 and 1962) calculated from known geological models. The resulting apparent positive correlations indicate that a procedure of estimating PSD plots from long time intervals of microtremor data would be useful in predicting response spectra for earthquake risk evaluation.




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