Friday, February 25, 2011

Arkansas Earthquake Update


Wow, the original 'checkmark' is filling in an a new tail is growing inline with the old one.  That means there is a prominent weakness parallel to the main graben.  These things always have multiple walls.

Probably means the thrust portion could not grow much past the injection point, which is a good thing.  The lower tail is penetrating the footwall, and I can't see it going that far.  The strike-slip earthquakes are normally split at the thrust fault so I can't see it ripping all the way with an M6.  However, we are well set now for an M5.  We really need fault plane solutions here!

Like I said facetiously earlier, another injection point along the thrust line could really give us something!!  :)

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