Largest earthquake since Northridge

Bob Dollar a USGS geophysicist told me at his office at Caltech (I was out the door to head there about a minute after the quake hit) that this quake is the largest since the 1994 6.7 magnitude Northridge earthquake.

He also said there is a 5 to 10 percent chance of an aftershock that would match the 5.4 magnitude of the original quake within the next several hours, though the chances decrease as time goes on.

Pasadena Fire Department PIO Lisa Derderian said there have no calls for any serious damage to 911 at this point.

Pasadena city hall and courthouse were evacuated as a precaution but we are not hearing about any injuries at this point

Reporter Nathan McIntire was driving during the earthquake and said he didn't feel it at all. I found that interesting because I was driving in the desert during a 7 magnitude quake in the Mojave in 1999 (it was not felt in Los Angeles County). I didn't feel it either, but stopped for gas 15 minutes after the quake.... a shaken attendant asked me if I had felt the quake. So maybe the natural motion of the car is not conducive to feeling quakes.