Wednesday, April 15, 2015
Oklahoma earthquake - extremely tiny and shallow
They are now reporting earthquakes below 2.5. I guess they got their extra seismic analyst. We are now going for a record for the tiniest earthquake being felt. The rule of thumb used to be that you needed a 3 to be felt, but OK is going way beyond that. This is an extremely shallow strike-slip (shear) earthquake, you can tell by the felt area to the NE. Their stated depths don't mean anything. Now, I really wish they had calibrated broadband seismometers so we could tell the PGV. My general experience Ontario is that it takes 0.5 mm/s to be felt. But I suspect that everybody is constantly on tenterhooks here, so that the sensitivity must be a lot lower, counteracted by the general apathy to report yet another one. :)
Update: Two high-three thrusts, giving an intensity 5, right on the main shear zone. In Chaos, anything can happen. :)
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