If you're in the Bay Area, you may have experienced a quick jolt followed by a slow roll at 3:20 A.M. I would categorize it as a moderate event. Not minor but not catastrophic. As I don't know where the epicenter was I'm going with a tentative 5.9 but we'll see when it's reported later today. I'm usually pretty good at guessing the magnitude but we shall see.

Where were you and how did you react the first time you experienced a quake?