Every year it is estimated over 1 million earthquakes shake the Earth, of course most of the the time we don't even notice unless we work for someone like the National Geological Survey. Every once in a while though one causes unimaginable devastation and suffering like the one that struck Haiti yesterday.
Here are the stats: http://earthquake.usgs.gov/ear
thquakes/eqarchives/year/eqst a ts.php
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