Ground Shaking


How Much Will The Ground Shake?

Bay area ground shake map
A Comparison with the Loma Prieta Earthquake

For the cities indicated, each colored bar shows how many times stronger a magnitude 7 earthquake on the same-colored fault segment is likely to feel in relation to the Loma Prieta earthquake.

Example: A magnitude 7 earthquake on the northern Hayward fault segment is likely to cause shaking in Oakland that is about twelve times greater than shaking felt during the 1989 Loma Prieta earthquake.
Loma prieta collapsed house

October 17, 1989

Loma Prieta Earthquake

Magnitude 6.9
414 Homes Destroyed
14,000 people left homeless

Not retrofitted soft story homes, where garages occupy most of the ground floor increase the odds of building failure during an earthquake.

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