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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.
Earthquakes have damaging effects on life, homes and property. However, an earthquake also has an effect on the environment. Damage to the environment during an earthquake can cause devastation and loss of life beyond that caused in the original event, and organizations such as the Federal Emergency Management Agency work to target areas most likely to be affected.