Hazard Maps of California
Earthquakes (1800-1994) with
Magnitudes 5 and Greater
The rate of historic earthquakes is
used to estimate the rate of future
earthquakes in calculating the
probability of earthquake shaking.
Shaking damage at Santa Rosa City Hall from the April 1906 San Francisco earthquake (Magnitude 7.9). Photo from Steinbrugge Collection, Earthquake Research Center, University of California, Berkeley.
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