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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.
This abrupt shift caused the biggest earthquake ever recorded, and a major tsunami. Many of the buildings in the affected cities had been designed to withstand earthquakes, and a number of smaller quakes in the months leading up to this disaster had given some warning.