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I just checked out the USGS site....a string of 3-4.7 earth quakes are everywhere...im not familliar, is this common?

You mean California or worldwide?

The 7.2 quake offshore California is going to be cranking out aftershocks for MONTHS....its aftershocks are pretty normal so far; typically they'll decline slightly week after week.

Worldwide, lots of quakes are normal; there are an average of 4 5+ magnitude quakes worldwide every day, and an average of over 35 magnitude 4+ quakes worldwide every day (that's a rough estimate because there are still enough gaps in worldwide seismic networks to miss some 4=5 magnitude quakes; all the 5+s pretty much get recorded.)