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Seismic Shaking Hazard Maps of California

Spectral Acceleration for 1-Second Period

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Tall buildings and large bridges are most affected by low frequency seismic shaking. Damage to the San Francisco-Oakland Bay Bridge in the 1989 Loma Prieta earthquake was caused by displacement of the piers as well as shaking. Photo from Steinbrugge Collection, Earthquake Research Center, University of California, Berkeley.


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