>"megathrust" earthquakes on the west coast every 400-600 years. ...there are the full-fault (M9) and partial-fault quakes (M8) , and the smaller ones happen m

>"megathrust" earthquakes on the west coast every 400-600 years. ...there are the full-fault (M9) and partial-fault quakes (M8) , and the smaller ones happen more frequently: https://projects.oregonlive.com/maps/earthquakes/timeline https://projects.oregonlive.com/maps/earthquakes/timeline >The Cascadia Subduction Zone has not produced an earthquake since 1700 and is building up pressure where the Juan de Fuca Plate is subsiding underneath the North American plate. Currently, scientists are predicting that there is about a 37 percent chance that a megathrust earthquake of 7.1+ magnitude in this fault zone will occur in the next 50 years. https://www.oregon.gov/OEM/hazardsprep/Pages/Cascadia-Subduction-Zone.aspx https://www.oregon.gov/OEM/hazardsprep/Pages/Cascadia-Subduc...