The Pacific Northwest may experience enormous earthquakes (Magnitude 8.0 to 9.0)

Question

The Pacific Northwest may experience enormous earthquakes (Magnitude 8.0 to 9.0) about every 300 to 500 years. These earthquakes occur along the contact between the Juan de Fuca Plate and the North American Plate. (Unlike the Satsop earthquake in 1999, the Duvall earthquake in 1996, or the Vashon earthquake in 1995, which occurred within the continental plate, or the Olympia (Nisqually) earthquake in 2001, which occurred within the oceanic plate.) The last really big earthquake in the Northwest occurred on January 26, 1700 A.D. What types of geologic evidence might we look for in the Pacific Northwest that records the occurrence of this earthquake? (Remember, the cities of Seattle and Bellevue didn't exist at that time.)

Explanation / Answer

Texhniques used

There is oral tradition in localpeople where tbey talk about big earhquake but they do not mention any date. The same earthquake also hit japan coast they had maintained record and mentioned date of 26 jan 1700 ad

TThis earthquake also legeographic signatures that huge forest was destroyed and by carbon dating of trees it is confirmed that these are near to 1700 ad

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