by C.B. Crouse
March 1995, 68 pp.
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A strong-motion database was compiled for California earthquakes of surface-wave magnitudes,
Ms ≥ 6, occurring from 1933 through 1992. The database consisted of horizontal peak ground
acceleration and 5 percent damped response spectra of accelerograms recorded on four different
local geologies: bedrock (class A), soft rock or stiff soil (class B), medium stiff soil
(class C), and soft soil (class D). The results of regression analyses of the database
within each of these site classes were used to derive a set of site-dependent spectral
amplification factors for oscillator periods between 0.1 and 4.0 sec and ground acceleration
levels between 0.1 and 0.4 g. The amplification factors at 0.3 and 1.0 sec periods are
generally similar to those recommended during the 1992 NCEER Site Response Workshop.