Although the locations and magnitudes are as crude as an 8-bit map, we may be seeing the beginning of an Arkansas structure. That is, the first earthquakes are on a NW trend, and there may be a NE shear wing. This could be resolved if they had better monitoring, but then that would mean they care, and might stop the injection. Can't have that! We've had our 3's, and now we wait for a 4.