“I have seen a map of the Pacific Ring of Fire that showed that the only location on that ring not to have had a Mega quake in the last 50 years is the Cascadia Subduction Zone. The last one was in 1700 which was between a 9 and 10 on the scale.”
This. I have family up there. Sure hope the big one doesn’t hit.
I think you meant to say “hit while they are there”, it WILL happen again. IIRC, the historic rate on that fault is about every 300 to 400 years, so we are about due. (I’m near Seattle).