I called my daughter in Berkley last night. She said it lasted about 15 seconds but didn't seem to cause much damage. She was on the phone with a friend in SF while it occurred, and they talked about it while it was happening without incident. 5.6 is a pretty strong quake for so little damage being reported. Maybe everything that is vulnerable to quakes that size and smaller has already broken or collapsed, so maybe they're in pretty good shape until a really big one shakes things up.