Sunday, February 23, 2014
Oklahoma earthquakes bounce back to shear
If I had any energy, I would really do this in 3d. There is shearing now along the NE zone, but it is along a gently dipping megathrust, so there will be some spread in earthquakes. The thrust (formerly a transform fault) is nearly vertical. Those earthquakes should be a lot tighter on the line. They will also be much louder and have a higher PGV for their magnitude. I am pretty sure there are no strong-motion instruments here.
We had massive activity on a very tiny portion of the thrust, and this was reported as 'explosions'. I doubt these new ones along the shear were as loud. I was expecting a larger thrust, but I think they are really downgrading them. I now expect larger shear (strike-slip) quakes. It would be going according to plan if the next shear quake were larger than the previous one (M4.5). That one did not produce any significant shaking, and I don't expect the next one will either. Then we go back to thrusts.
The next thrust will really knock people out of their socks, with a high-frequency pulse, but the seismologists will downgrade it significantly. That's okay, because I don't want anybody to think this is serious yet. :)
Update: Quite a few more, looks like a good run.
up2: M3 thrust down on the lower line. Hope there are some felt reports.
up3: Now we get a few days of rest. I swear that this is the laziest mechanism I've ever seen! :)
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