At the Cascadia subduction zone, tectonic plates slide against each other, building up stresses capable of unleashing a 9.0-magnitude earthquake and generating a tsunami, with waves as high as 40 feet.
By Carolyn Y. Johnson, The Washington PostThe tiny village of Tierra del Mar, Ore., is seen from a hill Monday, Aug. 17, 2020.
Because scientists don’t know when that day will arrive, they prepare by trying to better understand the geological state of play. The entire area, which stretches from Northern California to Vancouver Island, is at risk. But the scientists found that the geometry of the fault But to understand earthquakes, details matter. And seismologists typically learn those details by observing smaller earthquakes that pop off subduction zones. Since Cascadia has been eerily quiet in recent human history, many specifics remain fuzzy.
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