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Variation of Response Spectrum with Tectonic Environment and Focal Depth

by G.T. Lindley and R.J. Archuleta

Lindley, G.T., and R.J. Archuleta (1993). Variation of Response Spectrum with Tectonic Environment and Focal Depth. SMIP93 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 1 - 12.

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Abstract

The variation of response spectral shapes is examined for the 1980 Mammoth Lakes, 1983 Coalinga, and 1992 Southern California earthquake sequences. Significant variations of the response spectra are found between earthquakes of the Southern California earthquake sequence and earthquakes of the Mammoth Lakes and Coalinga sequences. These variations do not correspond simply to variations with tectonic environment, Variation of response spectral shape with focal depth is found for microearthquakes, but not for large, potentially damaging earthquakes (M > 6). Response spectral shapes vary with magnitude and the variation is significant when the difference in magnitude is approximately 2 or larger.