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Bulletin of the Seismological Society of America; February 1996; v. 86; no. 1B; p. S270-S288
© 1996 Seismological Society of America
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Engineering implications of ground motions from the Northridge earthquake

Susan W. Chang, Jonathan D. Bray and Raymond B. Seed

Department of Civil Engineering University of California, Berkeley, Berkeley, California 94720-1710

Abstract

The magnitude, duration, and frequency content of ground motions from the Northridge earthquake are analyzed and compared to predictive relationships typically used in engineering design and to the 1994 Uniform Building Code (UBC). A relationship between maximum horizontal acceleration on soil versus maximum horizontal acceleration on rock is presented based on strong-motion recordings at free-field sites. The effect of geologic conditions on localized damage patterns is shown to be important for this earthquake, although many of the sites within the affected region are stiff soil sites classified as S1 or S2 sites by the UBC. The results of preliminary seismic site response analyses performed at two deep alluvial sites indicate that much of the observed site amplification can be captured by one-dimensional wave propagation analyses.




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