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Friday marked the 324th anniversary of the Cascadia earthquake.Doug Toomey with the University of Oregon says about 20 to 30 years ago, geologists along the coa

Doug toomeyUniversity of oregonCascadia subductionCascadia subduction zoneUnited statesDisaster accidentEpisodic tremor and slipSlow earthquakeCascadia earthquakeSubduction zonesPlate tectonics