Broadband ground-motion simulation using a hybrid approach
Bulletin of the Seismological Society of America
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Abstract
This paper describes refinements to the hybrid broadband ground-motion simulation methodology of Graves and Pitarka (2004), which combines a deterministic approach at low frequencies (f< 1 Hz) with a semistochastic approach at high frequencies (f> 1 Hz). In our approach, fault rupture is represented kinematically and incorporates spatial heterogeneity in slip, rupture speed, and rise time. The prescribed slip distribution is constrained to follow an inverse wavenumber-squared fall-off and the average rupture speed is set at 80% of the local shear-wave velocity, which is then adjusted such that the rupture propagates faster in regions of high slip and slower in regions of low slip. We use a Kostrov-like slip-rate function having a rise time proportional to the square root of slip, with the average rise time across the entire fault constrained empirically. Recent observations from large surface rupturing earthquakes indicate a reduction of rupture propagation speed and lengthening of rise time in the near surface, which we model by applying a 70% reduction of the rupture speed and increasing the rise time by a factor of 2 in a zone extending from the surface to a depth of 5 km. We demonstrate the fidelity of the technique by modeling the strong-motion recordings from the Imperial Valley, Loma Prieta, Landers, and Northridge earthquakes.
Suggested Citation
Graves, R., Pitarka, A., 2010, Broadband ground-motion simulation using a hybrid approach: Bulletin of the Seismological Society of America, v. 100, no. 5 A, p. 2095-2123, https://doi.org/10.1785/0120100057.
ISSN: 1943-3573 (online)
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Broadband ground-motion simulation using a hybrid approach |
| Series title | Bulletin of the Seismological Society of America |
| DOI | 10.1785/0120100057 |
| Volume | 100 |
| Issue | 5 A |
| Publication Date | September 20, 2010 |
| 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 | 2095 |
| Last page | 2123 |