A great quake with no written record in America — but Japan logged its 'orphan tsunami,' and drowned forests and tree rings date the rupture to a January night in 1700.
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DownloadThe 1700 Cascadia Subduction Zone earthquake struck on January 26, 1700, registering magnitude 9.0 (estimated magnitude). Each whole step on the moment-magnitude scale is roughly 32 times more energy, so this released on the order of 31,623× the energy of a magnitude 6.0 earthquake.
Its epicenter was located near 45.00°N, 125.00°W, at a depth of about unknown — . Deep earthquakes are felt across a wide region but are usually less destructive at the surface than shallow ones of the same size.
An estimated unknown people were killed.