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The Cascadia Earthquake was a magnitude 8.7 – 9.2 megathrust earthquake in 1700. The earthquake involved the Juan de Fuca Plate in the Pacific ocean, from mid- Vancouver Island of southwest Canada off British Columbia to northern California, off what is now the Pacific Northwest of the United States.The fault slipped along about 1000 kilometers — around 600 miles.It took place at about 9:00 in the evening of January 26, 1700. Although there was no European settlement and no written records in the region at the time, the earthquake's precise date is nevertheless known from Japanese records of a tsunami that could not be tied to any other earthquake. The most important initial clue came from studies of tree rings ( dendrochronology) which showed a large number of fallen trees whose last year of growth was 1699– 1700; with this information, the Japanese tsunami records were then used to determine the exact date. Oral traditions also exist among the region's original inhabitants, although these do not specify the date.Its occurrence was confirmed in 2003 in an article by geologist Brian Atwater.
The Cascadia Earthquake may be linked to the Bonneville slide.
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