There are 9,978 earthquake incidents in Washington on record since 1931. The state averages 120 earthquakes per year. The largest earthquake on record for Washington occurred on 06/23/1946, with a depth of 35.0 miles and a magnitude of 7.6 on the Richter scale in Clallam County, WA.
Yearly Average Number of Earthquakes in Washington
Total Number of Earthquakes in Washington since 1931