Research Unlocks Secrets of Tiny Tremors, New Research Unlocks Secrets of Tiny Tremors That May Forecast Disastrous Earthquakes - CBS News: "The Pacific Northwest is another hotspot, a zone that has seen several 7-magnitude and stronger quakes in the last century and where a 9-magnitude quake is estimated to hit and trigger devastating tsunamis once every 400 to 600 years.
The last quake of that force struck the area in 1700.
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