M 6.4 - South of Sonoma, California

At Mare Island Naval Yard and on Tubbs Island, several buildings either partly or totally collapsed. Property loss was estimated at $350,000 [equivalent to approximately $10.9 million in 2020 dollars¹]. The earthquake also caused severe damage at Schellville, Greenwood Estate [west of Tubbs Island²], and along Petaluma Creek in Sonoma County, where houses were moved off their foundations. Extensive cracks developed in the ground at Greenwood Estate, Mare Island Naval Yard, and Schellville. Moderate damage occurred in San Francisco. This quake was felt north to Chico, east to Carson City, Nevada, and south to Monterey. (Ref. 56, 368, 521, 615.)

Maximum observed Modified Mercalli Intensity (MMI) VIII

Abridged from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Stover and Jerry L. Coffman, U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, Washington: 1993.

In addition, chimney damage occurred as far away as Alamo and Santa Rosa and clocks stopped as far away as Santa Cruz, Stockton, Sacramento and Ukiah.

Abridged from ² Preparation of isoseismal maps and summaries of reported effects for pre-1900 California earthquakes, by T.R. Toppozada, C.R. Real and D.L. Parke, California Division of Mines and Geology Open-File Report 81-11 SAC, Sacramento: 1981; updated and presented by interactive map on California Geological Survey website (http://maps.conservation.ca.gov/cgs/historicearthquakes/).

¹ Based on US Bureau of Labor Statistics Consumer Price Index and calculated in "Inflation Calculator", U.S. Official Inflation Data, Alioth Finance (https://www.officialdata.org/), retrieved 02 Sep 2021.