Replies

We had the Landers earthquake in 1992 and it was a 7.4 in intensity. I don’t get how that wasn’t “ the big one”. >< I think they have determined that the “Big One” will be at least 9.0. I’m probably way off.

The San Andreas' "big one" will be nothing like the Cascadia Subduction Zone's big one.

The San Andreas fault zone is two plates moving sideways relative to each other. It locks up, then releases.

The Cascadia zone is one plate diving (subducting) beneath another. This zone (which stretches from northern Cali to northern Wash) can unzip the length of two states, releasing energy that is, IIRC, an order of magnitude above the San Andreas.