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Washington State Earthquake History. Major earthquakes in Washington since 1880 (source: USGS) On December 14, 1872, a strong earthquake in the Cascade Mountains caused damage at Victoria, British Columbia, and Seattle. It was felt over a very large area, about 390,000 square kilometers, extending as far south as Eugene, Oregon, and north into British Columbia, probably even into Alaska.
Seabeck-area historical earthquake activity is near Washington state average. It is 143% greater than the overall U.S. average. On 4/13/1949 at 19:55:42, a magnitude 7.0 (7.0 UK, Class: Major, Intensity: VIII - XII) earthquake occurred 31.0 miles away from the city center, causing $80,000,000 total damage.