So this was on the Sierra Madre Fault?

That is what it looked like to me too. I was just out and about and listening to KNX and KABC radio, they were reporting this may have been an aftershock to the 94 Northridge quake. But looking at the map, and correct me if I'm wrong, but tonight's events look east of the Northridge shock.

At any rate, indeed I'll be making sure everything is in check.

BTW, I didn't feel it, I live in W. LA. Kinda wierd.