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Effects of 3D random correlated velocity perturbations on predicted ground motions

Bulletin of the Seismological Society of America

By:
, , and
DOI: 10.1785/0120090060

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Abstract

Three-dimensional, finite-difference simulations of a realistic finite-fault rupture on the southern Hayward fault are used to evaluate the effects of random, correlated velocity perturbations on predicted ground motions. Velocity perturbations are added to a three-dimensional (3D) regional seismic velocity model of the San Francisco BayArea using a 3D vonKarman random medium.Velocity correlation lengths of 5 and 10 km and standard deviations in the velocity of 5% and 10% are considered. The results showthat significant deviations in predicted ground velocities are seen in the calculated frequency range (???1 Hz) for standard deviations in velocity of 5% to 10%. These results have implications for the practical limits on the accuracy of scenario groundmotion calculations and on retrieval of source parameters using higher-frequency, strong-motion data.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of 3D random correlated velocity perturbations on predicted ground motions
Series title:
Bulletin of the Seismological Society of America
DOI:
10.1785/0120090060
Volume
100
Issue:
4
Year Published:
2010
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
1415
Last page:
1426
Number of Pages:
12