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		 My armchair observation: Don't the big ones tend to occur on faults previously unknown or faults thought to be dormant? I don't remember any significant earthquakes on the San Andreas, which is popularly thought to be the one to worry about. 
 
Again, this is WAS* on my part. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 *WAS = Wild Ass Speculation 
		
	
		
		
		
		
			
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