Welcome to southern California. The region experiences large magnitude earthquakes about every 20 years - large being 6 to 7.3. These are scary to be in if you are close to the epicenter, say, within 50 miles. Close by, the nearest large faults are the Elsinore and San Jacinto, as well as some offshore. The San Andreas fault is the "big one" that the Cal Tech and USGS scientists like to talk about, but its magnitude potential is often overstated (7.3 magnitude max). Besides, it is quite a ways from you - you will feel it, but at a distance. The major problem I would be concerned with would be food, water and comfort in a region of 12 million people that are having some shortages. Not surprisingly, many people are injured by aftershocks, which can be weeks later, but significant events of 5 or 6 magnitude, shaking already weakened buildings.
PS. When a big one shakes, you will not be able to stand, walk or move during the event, so forget all that advice about getting in a doorway or under a table or whatever.