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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.
The Great San Francisco Earthquake of 1906. The great San Francisco earthquake struck on Wednesday, April 18, 1906 at 5:12 am, with the offshore epicenter about 3 km (2 mi) south of the city. It ruptured 477 km (296 mi) along the San Andreas Fault. People felt shaking from Oregon in the Pacific Northwest to Los Angeles and from the inland to central Nevada.