Estimation of Ground Motion at Deep-Soil Sites in Eastern North America
Kun-Ying Chou
Abstract
Equations giving ground motion as a function of magnitude and distance were published by Boore and Atkinson (1987) for hard-rock sites in eastern North America. The expected equations were obtained by fitting the stochastic model to synthetic ground motions. Boore and Joyner (1991), they modified stochastic model to include the effect of deep soils. Their approach is to simulate the ground motions for 17 distances range from 10 to 400 km and for moment magnitudes from 5.0 to 8.5 for a representative soil profile, whose properties represent an average of the properties of many individual profiles. Then, they used the simulated motions to fit the equations giving ground motion as a simple function of magnitude and distance. These new equations are intended to give estimates of the motions for deep soil sites and are to be used in building codes without detailed site evaluations. The derived equations include 5%-damped response spectra at period rangefrom 0.05 to 4 sec, peak acceleration, the maximum pseudovelocity andmaximum pseudoacceleration responses. The latter two quantities are introduced in the article for the first time. They represent the maxima over the period range0.1 to 4 sec for a given magnitude and distance, and a discussion is included of possible use in determining the seismic coefficient in building codes.
References
Boore, D. M. and G. M. Atkinson, 1987. Stochastic prediction of ground motion and spectral response parameters at hard-rock sites in eastern North America. Bulletin of the Seimological Society of America;77, 440-467.
Boore D. M. and W. B. Joyner, 1991. Estimation of ground motion at deep-soil sites in eastern North America. Bulletin of the Seimological Society of America; 81, 2167-2185.
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