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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.
Here is how the basic tsunami warning system works in the Pacific Northwest area. First, a key concept -there are two sources of tsunami for Washington coastal waters - a distant source and a local source. A local source - if you feel violent shaking for several minutes, head for higher ground. The earthquake is your warning.