Initial overview of the San Francisco Bay and Santa Cruz mountains ground motion
NIST Special Publication
By: A. Gerald Brady
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Abstract
The strong-motion accelerograms from the Loma Prieta earthquake are analyzed for their long-period content in order to obtain a clearer picture of the long-period wave propogation details. Shear waves having periods in the 3.5 to 4 sec, and 5 to 7 sec ranges travel across four groups of stations with satisfactory coherency. Displacement accuracies are of the order of 0.5 cm for most of this data, with signal amplitudes an order of magnitude higher than the noise. Resonances associated with shear waves of 1.5 sec period are responsible for about 3/4 of the differential displacement necessary to unseat the 15 m section of the Bay Bridge.
Suggested Citation
Brady, A.G., 1990, Initial overview of the San Francisco Bay and Santa Cruz mountains ground motion: NIST Special Publication, no. 796, p. 283-288.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Initial overview of the San Francisco Bay and Santa Cruz mountains ground motion |
| Series title | NIST Special Publication |
| Issue | 796 |
| Year Published | 1990 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | NIST Special Publication |
| First page | 283 |
| Last page | 288 |
| Conference Title | Proceedings of the 22nd Joint Meeting of the US-Japan Cooperative Program in Natural Resources Panel on Wind and Seismic Effects |
| Conference Location | Washington, DC, USA |
| Conference Date | 15 May 1990 through 18 May 1990 |