Here is my hypothesis: The location of meteorites crashes are not random. They are not spread out equally around the world. What do I base this on? The map.
Look at it!
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The Chelyabinsk region is like the surface of the moon! Perhaps there is a logical explanation: lazy map makers, beavers, Soviet engineering... But man, does it ever look like a bunch of meteorites crashed in to the region.
-What Do We Know about the Russian Meteor?
-Meteorite Hits Russia, Causing Panic (in case of WSJ paywall, Google the title)
-Videos of Russian Meteorite Captured by Bystanders