Well, I've been through a lot of quakes here in the SF area, and I don't see a big land mass sinking, ever. I'd sooner believe in Yellowstone erupting and destroying a third of the country, or the Cascadia fault destroying the northwest with a tsunami, or the Missippi River are being destroyed by a huge quake - any of those would occur first. Quakes here cause infrastructure damage due to shaking, or fire damage. I remember a quake in the 1950s knocking down the whole front facade of a home into the street, two blocks from my house.
That's what smaller quakes do, limited damage. 1989 quake was very severe, glass panels and brickwork falling into the streets downtown where I worked, then driving through the Marina district where most chimneys were down and seeing the fires from burning collapsed buildings. A big one on the Hayward fault will cause the same type of damage.
You’re talking to yourself roadcat.