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The Earth's probably like swiss cheese with underground caverns - many likely made by fracking and unstable, Maybe the ceiling gave way in a big one - any sink holes opened up in the vicinity?
That's just my guess and a little knowledge is a dangerous thing, but who knows?
edit on 10-4-2014 by McGinty because: (no reason given)
I doubt they are fracking in LA
Heres my problem with this... can an aircraft make a sonic boom that would be felt from San Clemente to LA?? I mean it shook houses all the way down the coast lol that just doesnt make sense to me.