Friday, December 5, 2014

Oklahoma - a tale of two earthquakes

Just now we have had an earthquake of M4.0 that almost nobody felt.

This was a mostly normal earthquake (tension) with about half being shear.

But, earlier, we had an M4.2 that was strongly felt.

This was thrust, with a very small hammer zone.  No fault plane solution could be calculated.  Even a 3.6 thrust had a greater narrow intensity than the recent 4.0

Now, the USGS believes that these induced earthquakes have less bang for the buck.  They should be in the hammer zone when we get the 5 thrust.  :)

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