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The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26, 1700, with an estimated moment magnitude of 8.7–9.2. The megathrust earthquake involved the Juan de Fuca plate from mid-Vancouver Island, south along the Pacific Northwest coast as far as northern California. The plate slipped an average of 20 meters (66 ...
The last known great earthquake in the northwest was the 1700 Cascadia earthquake, 324 years ago. Geological evidence indicates that great earthquakes (> magnitude 8.0) may have occurred sporadically at least seven times in the last 3,500 years, suggesting a return time of about 500 years.
English: A scenario macroseismic intensity map of the median ground motion values from magnitude 9.0 scenario earthquake on the Cascadia Subduction Zone. Maximum intensity of IX (Violent). Maximum intensity of IX (Violent).
Over the past century, scientists have only observed five magnitude-9.0 or higher earthquakes — all megathrust temblors like the one predicted for the Cascadia Subduction Zone.
Scientists say that the Cascadia subduction zone off the coast of the Pacific Northwest has the potential to spark a magnitude-9.0+ earthquake, plus a subsequent tsunami. That scenario last ...
The 1700 Great Cascadia earthquake was the most recent big quake in the zone. If one similar to it were to occur now, researchers say it would have significant impacts: 10,000 casualties ...
All this is at risk of earthquakes from three sources: [3] A great subduction earthquake, such as the magnitude M 9 1700 Cascadia earthquake, caused by slippage of the entire Cascadia subduction zone, from approximately Cape Mendocino in northern California to Vancouver Island in British Columbia.
Northern California has an estimated 12% chance over the same 30 years of an M ≥ 8 megathrust earthquake on the Cascadia subduction zone. [6] UCERF has also prepared "participation probability maps" [7] of the chance that any area will experience an earthquake above a certain magnitude from any source in the next 30 years (see figure).