From Tay Bass, a site he checks every morning showing all the seismic activity in California.
http://quake.wr.usgs.gov/recenteqs/latest.htm
Tay says, "It shows the quakes in California for the last week. Most people are surprised/concerned when they see the caption such as "365 quakes on this map." Also of note is is that red indicates a quake in the last hour. It automatically raises thoughts- Is there one near you? Did you feel it? But most of these are much too small to be felt. It takes a minimum of a nearby 3 for most people to discern a difference between a quake and a passing truck.
"OK, so you already know that California is more seismically active than the 48 states. But how much? Click on this link-
http://earthquake.usgs.gov/recenteqsUS/
Yup, almost all the activity is indeed in California.
