It lasted about a second. I felt the floor shake a little, and heard a rumble too. It could easily have been just a heavy-ass truck going across the bridge. But, according to the guy on the phone, he felt it there in Berkeley too. Annie says we generally don’t feel them in this building, so it must have been a semi-strong one. I just looked it up:
http://quake.wr.usgs.gov/recenteqs/Quakes/nc40200915.htm
Looks like it was a 3.0 ….and if you’d like to keep track…
http://quake.usgs.gov/recenteqs/Maps/San_Francisco.htm