The Earthquake Engineering Online Archive

Site-dependent spectra for earthquake-resistant design

Seed, H. Bolton; Ugas, Celso; Lysmer, John

UCB/EERC-74/12, Earthquake Engineering Research Center, University of California, Berkeley, 1974-11, 39 pages (450/S41/1974)

The report presents the results of a statistical analysis of the spectral shapes of over 100 ground motion records obtained from 23 earthquakes, mostly in the western part of the United States. The analysis shows clear differences in spectral shapes for different soil and geologic conditions, indicating the need for consideration of these effects in selecting earthquake-resistant design criteria.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-74-12.pdf (1 MB)