Random Source Effects on Seismic Ground Motions
Publication: Journal of Engineering Mechanics
Volume 116, Issue 6
Abstract
The effect of randomness in the rapture process at the source on the near‐field seismic ground motions is examined. Time histories and response spectra are determined at an observation point in the vicinity of a vertical, strike‐slip fault. The seismic motions resulting from a deterministic, kinematic source model with uniform slip are compared with the motions obtained from stochastic models, in which the rupture parameters vary randomly along the length of the fault. The analysis shows that the random variability in the source parameters (namely, the dislocation amplitude, the rise time, the rupture velocity, and the fault width) enriches the frequency content of the motions. When the random variability in each rupture parameter is investigated separately, it is found that randomness in the rise time and the rupture velocity enhances the frequency content of the motions, whereas the variation in the dislocation amplitude and the fault width produces motions similar to the deterministic ones.
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References
1.
Aki, K. (1984). “Earthquake source mechanism.” Earthquake source modeling, ground motion and structural response, S. K. Datta, ed., American Soc. of Mech. Engrs., 1–12.
2.
Boore, D. M. (1983). “Stochastic simulation of high frequency ground motions.” Bulletin Seism. Soc. America, 73(6), 1865–1894.
3.
Boore, D. M., and Joyner, W. B. (1978). “The influence of seismic incoherence on seismic directivity.” Bulletin Seism. Soc. America, 68(2), 283–300.
4.
Boore, D. M., and Zoback, M. D. (1974). “Near‐field motions from kinematic models of propagating faults.” Bulletin Seism. Soc. America, 64(2), 321–342.
5.
Hanks, T. C. (1979). “Seismological aspects of strong motion seismology.” Proc., Second U.S.‐National Conf. on Earthquake Engrg., Earthquake Engineering Research Institute, 898–912.
6.
Haskell, N. A. (1964). “Total energy and energy spectral density of elastic wave radiation from propagating faults.” Bulletin Seism. Soc. America, 54(6), 1811–1841.
7.
Haskell, N. A. (1969). “Elastic displacements in the near‐field of a propagating fault.” Bulletin Seism. Soc. America, 59(2), 865–908.
8.
Joyner, W. B., and Boore, D. M. (1980). “A stochastic source model for synthetic strong motion seismograms.” Proc., Seventh World Conf. on Earthquake Engrg., International Association of Earthquake Engineering, Istanbul, Turkey, 1–8.
9.
McGuire, R. K., and Hanks, T. C. (1980). “RMS accelerations and spectral amplitudes of strong ground motion during the San Fernando, California, earthquake.” Bulletin Seism. Soc. America, 70(5), 1907–1919.
10.
Rascón, O. A., and Cornell, C. A. (1969). “A physically based model to simulate strong earthquake records on firm ground.” Proc., Fourth World Conf. on Earthquake Engineering, Santiago, Chile, 84–96.
11.
Savy, J., and Cornell, C. A. (1980). “A theoretical earthquake model to complement empirical studies of strong ground motion attenuation.” Proc., Seventh World Conf. on Earthquake Engineering, International Association of Earthquake Engineering, Istanbul, Turkey, 593–597.
12.
Shinozuka, M. (1987). “Stochastic fields and their digital simulation.” Stochastic mechanics, M. Shinozuka, ed., Columbia Univ., New York, N.Y., 1–44.
13.
Zerva, A. (1988). “Seismic source mechanisms and ground motion models.” Prob. Engr. Mech., 3(2), 64–74.
14.
Zerva, A., Ang, A. H.‐S., and Wen, Y. K. (1986). “Development of differential response spectra for lifeline seismic analysis.” Prob. Engr. Mech., 1(4), 208–218.
Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 116 • Issue 6 • June 1990
Pages: 1198 - 1219
Copyright
Copyright © 1990 ASCE.
History
Published online: Jun 1, 1990
Published in print: Jun 1990
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