by C.B. Crouse and J.W. McGuire
Crouse, C.B., and J.W. McGuire (1994). Site Response Studies for Purpose of Revising NEHRP Seismic Provisions . SMIP94
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 21 - 34.
Click on the link below for the full text:
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 analysis 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.