Just as we were expecting, a 4.4 magnitude (4.2M revised) earthquake has struck Central Oklahoma at a fracking operation.
This Oklahoma earthquake activity follows a 2.9M at the Southern Colorado fracking operations, and a series of larger earthquakes along the West Coast, including a 5.5M off the shores of California, a 6.2M off the shores of Vancouver Island BC, and two back to back 4.2M earthquakes in Northern Idaho (along the edge of the craton).
This movement was forecast to occur in the most recent earthquake forecast, calling for a mid 4.0M earthquake to strike Oklahoma within a few days (issued the warning on April 24, 2015).
Specifically speaking about Oklahoma at approximately 15min 30sec:
M4.2 – 9km NE of Guthrie, Oklahoma
|Magnitude / uncertainty||4.2 mb_lg± 0.0|
|Location / uncertainty||35.944°N 97.359°W± 1.5 km|
|Depth / uncertainty||8.4 km± 7.9|
|Origin Time||2015-04-27 22:22:17.920 UTC|
|Number of Stations||–|
|Number of Phases||31|
|Minimum Distance||18.37 km (0.17°)|
|Travel Time Residual||0.21 sec|
|FE Region||Oklahoma (499)|