Notable Earthquake of the Week
Santa Rosa, California, M5.6 & M5.7 Earthquake

On October 1, 1969, two moderately strong earthquakes measuring M 5.6 and M 5.7 occurred at 8:57 pm and 10:20 pm, respectively, near Santa Rosa.

The shaking intensity registered VII-VIII on the Modified Mercalli Intensity scale, a relative shaking intensity rating from 1-12 and shown in Roman numerals, indicating the quakes shook quite hard and caused significant damage.

A number of old brick and wood frame structures were damaged beyond repair. Chimneys toppled, underground pipes ruptured and many walls cracked or collapsed. Virtually every store in downtown Santa Rosa sustained broken windows.

It was the strongest shaking in the Santa Rosa area since the powerful 1906 San Francisco quake. There were two quakes registering about M 5.0 on the Rodgers Creek fault system in 1865 and 1891 but it has been ominously quiet since the 1969 events.

Information provided by Jon Warner

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