I have a friend who is a geologist. He says that there's not enough info to say for certain that the AR earthquakes were caused by fracking.
Apparently, in the past few years we have greatly increased the number of seismological monitoring stations, so you can't just compare old data to to new.
He also said that there's no enough data to rule out that fracking caused the earthquakes either.
Here, we all noted that the AR earthquakes started when the fracking here started and then stopped when the fracking stopped.
That's enough reason to suspect fracking as the cause, imho.