Oregon Geology

SUMMARY Broad pocket beaches, low marine terraces, and numerous small estuaries are characteristic features of the northern Oregon coast, the middle part of the Cascadia coastline that extends from British Columbia to northern California. Like the middle child, the northern Oregon coast provides the link between the northern and southern ends of the Cascadia margin. Perhaps less dramatic in relief but not in beauty, this central Cascadia coastline differs significantly from the jagged coastlines of northern Washington and southern Oregon! northern California. The apparent geologic quiescence of the north­ ern Oregon coast does not reflect the catastrophic earthquakes that have struck the region in recent prehistoric time. On this field trip, we explore the northern half of the Oregon coastline for geologic evidence of subduction zone seismicity. Such evidence includes multiple events of abrupt coastal subsidence, tsunami inundation, and shaking-induced liquefaction of unconsoli­ dat...

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