Thursday, September 1, 2011

Virginia aftershock creep


An M3.4 is decent.  I still don't have any indication that these crazy people have put in more instruments.  One sign would be that they are locating earthquakes below M2 --- not happening!

As such, I don't know how much faith we can put in the aftershock locations, but I find this one interesting.  With induced earthquakes, such as this one, the actual location of the earthquake is a function of suitable geology and stress, drawn in by the location of the lake.  This earthquake found a nice slick fault on the edge of a seismic zone.  The zone has now expanded towards the lake.

Had there been decent Canadian-style instruments in the years leading up to this, we would have traced the path of M1's and 2's.  I'm sure the fault maintains its slickness to the lake and beyond, so we should see more earthquakes creep in that direction.  Because they refuse to instrument properly, we'll only see the big earthquakes.

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