Sunday, April 6, 2014

OK M4.0 - Primary shear zone shoots back

Like I said before, that other earthquake was off the main zone, and the only thing it could do is load the primary shear wing.  That has just happened with this earthquake, and this then sheds stress to the thrust, which we haven't heard from lately.  Although no mechanism is posted, this one is most likely pure shear, and will not be downgraded.

Update:  Fault plane solution in.

Look at that sucker!  No wonder it won't be downgraded.  It's strike-slip with an extension component.  That is one seriously mucked up earthquake, since everything around is compressive.  I think our megathrust is back-slipping a little.  This really lets the strain energy drift towards the thrust.  We should see soon.

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