6.9 in Baja California It certainly lasted quite a while, though, and built pretty steadily. I did feel compelled to get away from windows and my monitor was swaying quite a bit at the peak. I've also noticed at least one small and very brief aftershock. I suspect things will be pretty rough closer to the epicenter.
EDIT: Ah, here's the aftershock I probably felt:
3.4 near Julian