Its good for those faults, especially that one, to let off a bit of steam, so to speak.
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yup,, we had a couple little poppers up the bay area way as well the last few days..
Latest Earthquakes in the USA - Past 7 days
http://earthquake.usgs.gov/eqcenter/recenteqsus/
Map for California and Nevada
http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/special/California_Nevada.php
Yep, this is that time of year (or so it seems).