Allow me to insert the typical response of most people on such matters: “Oh, that would never happen. You’re just being a fearmonger.”
We had a thread on this back in ‘03 or 4 where the USGS exploded hundreds of charges along the fault to see what the seismic readings would be.
Some of the really old threads are hard to find - we’ve had so many server wipes over the years I think a big chunk are lost.