A few days before the Northridge quake, all the way up here in San Jose, we found thousands of dead ants piled up around the edges in our shower stall. It was the weirdest thing. Like they were using it for their burial grounds. :lol This went on, off and on for months. It would take 10 minutes to rinse them down the drain there would be so many ants. Once the larger aftershocks let up it quit. Never happened before or since. Will let you know if it does. ;)