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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.
ï· Of the five Cascade volcanoes, Mt. Rainier is the most significant threat. Lahars from Mt. Rainier have buried the. Kent Valley, but there is no evidence a lahar has reached Seattle in the past 10,000 years.