The Oregon Department of Geology and Mineral Industries produced this map to show earthquakes in Oregon from 1841 through 2002. The state’s most active areas are Portland and Klamath Falls.
About 20 percent of Oregonians carry earthquake insurance, according to 2009 data from the Oregon Insurance Division. Earthquake insurance is not part of homeowner policies and must be purchased separately.
Here is a larger version of the map

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