But where in respect to the ridge? Most injection wells are about 10K or less deep in Logan, Payne so forth aren’t they? Aren’t the quake epicenters much deeper than the water could reach?
Remember the shallow quakes at Rocky Mountain Arsenal caused by water injection?
The faults are rooted in the Precambrian basement and extend upwards into the Paleozoics, i.e. the Arbuckle where I hear most of the injection is occurring as it still has some porosity retained.