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Initial overview of the San Francisco Bay and Santa Cruz mountains ground motion

NIST Special Publication

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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.

Additional Publication Details

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
Number of Pages:
6
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