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PROCEEDINGS OF THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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A. Gerald BRADY, Lisa K. STEELE
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LONG-PERIOD GROUND MOTIONS FROM RECORDED ACCELEROGRAMS LOMA PRIETA EARTHQUAKE OCTOBER 1989 M7.1
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The long-period content of the strong-motion accelerograms from the Loma Prieta earthquake is analyzed for a clear picture of the overall ground motions. Shear waves having periods in the 3.5 to 4 s, and 5 to 7 s ranges travel across four groups of stations. Displacement accuracies are of the order of 0.5 cm for most of this data. Resonances associated with shear waves of 1.5 s period are responsible for about 3/4 of the differential displacement necessary for the failed 15 m section of the Bay Bridge to shift off its seating.
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