Effects of 3D random correlated velocity perturbations on predicted ground motions
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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 Bay Area using a 3D von Karman random medium. Velocity correlation lengths of 5 and 10 km and standard deviations in the velocity of 5% and 10% are considered. The results show that 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 ground-motion calculations and on retrieval of source parameters using higher-frequency, strong-motion data.
| 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 |
| Publisher | Seismological Society of America |
| Publisher location | Stanford |
| Description | 12 p. |
| 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 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |