Thursday, April 2, 2015
M4.0 Missouri Earthquake - Oh, New Madrid, where is thy sting?
Finally, something interesting. Although Oklahoma is the New-New Madrid, this is the grand old lady herself, still active. Both places have identical mechanisms, that of a giant water drain, but NM has shot its load. But water is still flowing in, and it can extend.
This earthquake is right at the end of the southern shear wing. You can see it is a deep strike-slip along the fault line. But that's probably it for another year or two. NM is a natural seep, and a thousand times slower than OK.
Update: Discounted down to M3.6 which is quite a huge firesale discount. That probably means it was over 20 km deep.