Cascadia Earthquake
The Cascadia Earthquake was a magnitude 9 megathrust earthquake of 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.
It took place at about 9:00 in the evening of January 26, 1700,
While no one who lived there at the time kept written records, the earthquake's occurrence is known from Japanese records of a tsunami that could not be tied to any other earthquake. The natives have oral traditions.
Other megathrust earthquakes are the slightly more powerful 1964 American Good Friday Earthquake measured at 9.2, and the 1960 Great Chilean Earthquake measured at 9.5 on the Richter scale.
See also New Madrid Earthquake, which measured 8.0 or higher (the Richter sale had not been invented yet).
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