Not sure if any of you have seen this yet...
From news.bbc.co.uk...
Many recent earthquakes may have been the aftershocks of large quakes that occurred hundreds of years ago, according to scientists.
If this is true, and let’s face it some of the recent quakes have not been small, then just how big were the original quakes???
In the journal Nature, researchers described a new pattern in the frequency of aftershocks that could explain some major quakes.
They found that, away from plate boundaries, echoes of past earthquakes can continue for several hundred years.
The scientist go on to say that this could also explain why you can get major earthquake away from major faults.
Anywho... i am certainly no expert in this field... just found it interesting and thought that some of you guys may be interested. 
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