I (nowhere near California, but living in a seismic zone) was wondering how news worthy a 5.1 was until I saw the very shallow depth you posted. Yeah, you'll really feel that one if you're nearby.
30 mi from epicenter and got a google alert before the very mild shake. More tripped out about the pre-alert and how cool that was than the quake.
Depending on how much pre alert you get you could have fun at the bar or with friends.