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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 .
Today, the Cascadia Subduction Zone remains eerily quiet. In other subduction zones, scientists often observe small earthquakes frequently, which makes the area easier to map, according to ...
In the crowded field of active or potentially active fault zones that have been discovered in the lower Snoqualmie Valley, the Cherry Creek fault zone is particularly notable because east of Duvall [81] it passes through a hotspot of active seismicity, including the 1996 M L 5.3 Duvall earthquake. [82]
The boundary between the two is known as the megathrust, or the Cascadia subduction zone, fault. “That plate-boundary fault is normally locked, and stresses build up, and then when it lets go ...
At around 9 p.m. on Jan. 26, 1700, the ground shook for one to two minutes, scientists estimate, when a massive rupture occurred along the Cascadia subduction zone.
This list covers all faults and fault-systems that are either geologically important [clarification needed] or connected to prominent seismic activity. [clarification needed] It is not intended to list every notable fault, but only major fault zones.
And there are the infrequent but very powerful great subduction events, such as the magnitude 9 1700 Cascadia earthquake, where the entire Cascadia subduction zone, from Cape Mendocino to Vancouver Island, slips. [29] But the Seattle and Tacoma faults are probably the most serious earthquake threat to the populous Seattle–Tacoma area.