Estimation of ground motion variability in the CEUS using simulations

By: , and 
Edited by: Stephen H. Hartzell



We estimate earthquake ground-motion variability in the central and eastern U.S. (CEUS) by varying the model parameters of a deterministic physics-based and a stochastic site-based simulation method. Utilizing a moderate-magnitude database of recordings, we simulate ground motions for larger-magnitude scenarios M6.0, 6.5, 7.0, 7.5, and 8.0. For the physics-based method, we vary the faulting mechanism, slip, stress drop, rupture velocity, source depth, and 1D velocity structure. For the stochastic method, we simulate realizations using a set of six model parameters, each of which has a pre-assigned probability distribution. The median spectral accelerations over all synthetic realizations are compared with the NGA-East models. The synthetic standard deviation for deterministic simulations ranges from approximately 0.4 to 0.85 for various magnitudes and distances, whereas that for stochastic simulations is between 0.48 and 1.04. Based on the simulation results and comparisons with NGA-East variability models, a range for ground motion variability in the CEUS is discussed.

Publication type Conference Paper
Publication Subtype Conference Paper
Title Estimation of ground motion variability in the CEUS using simulations
DOI 10.22725/ICASP13.075
Year Published 2019
Language English
Publisher Seoul National University
Contributing office(s) Geologic Hazards Science Center
Description 75; 8 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title ICASP 13 Proceedings
Conference Title 13th International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP13)
Conference Location Seoul, South Korea
Conference Date May 26-30, 2019
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