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The Cascadia subduction zone is a 960 km (600 mi) fault at a convergent plate boundary, about 100–200 km (70–100 mi) off the Pacific coast, that stretches from northern Vancouver Island in Canada to Northern California in the United States.
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 .
For decades, scientists have warned about the potential of the Cascadia Subduction Zone, a megathrust fault that runs offshore along the coast from northern Vancouver Island to Cape Mendocino ...
Excerpt from Bouguer gravity anomaly map , showing approximate locations of the Seattle Fault zone (line E), Seattle Uplift (red, and adjoining yellow border), parts of the Tacoma Fault Zone (green; the pair of green lines mark the Rosedale Monocline), Tacoma Basin (light blue), Dewatto Basin (northwestern portion of Tacoma Basin at C), Dewatto ...
A magnitude-9.0 earthquake on the Cascadia fault and the resulting tsunami would kill an estimated ... A map of the Pacific Ring of Fire — where tectonic plates converge to form subduction zones ...
And there was the catastrophic mega-tsunami of 1700, originating from a magnitude 9 earthquake over the Cascadia fault system, which runs offshore from Northern California to Vancouver Island for ...
The Cascadia subduction zone is capable of producing megathrust earthquakes on the order of MW 9.0. Due to the relative plate motions, the triple junction has been migrating northwards for the past 25–30 million years, and assuming rigid plates, the geometry requires that a void, called slab window, develop southeast of the MTJ. [4]
Off the coast of Oregon and Washington, a smaller plate called the Juan de Fuca is slowly being dragged underneath the North American, creating a giant fault known as the Cascadia Subduction Zone.