[Naspino]

A major earthquake occurs along the Cascadia Subduction Zone approximately every 300 years, and the area is now overdue for a major event (the last one occurred exactly 302 years ago in 1700 AD, which triggered tsunami that wiped out several Indian tribes in Oregon). I suppose there is evidence that the other happened in 1400 AD? Or is it every 300 years based on a record from 1700? and in 25 years it'll happen every 325 years?

[Travis McGee]

I'll call Art Bell and get the precise number.

[rwfromkansas]

I would assume they have evidene of it occurring around 300 years each time or they would not claim such.