Pumping millions of gallons of fracturing fluid into the bedrock, at 10,000 psi, enough force to litteraly fracture the rock isn't likely to cause any seismic activity?
Do you realise that just a few gallons at 10,000 pounds per square inch (psi) can easily lift the Empire State Building?
You seem to have no concept whatsoever of the forces involved in fracking.
That also isn't what the story is about. They are trying to say that an otherwise quiet place is suddenly active because of fracking. They ignore that there was an active fault line there to begin with.
Reality: There is no evidence that fracking causes more plate activity. Even wide area fracking is minimal in comparison to geological shift. Your argument here is childlike. It can "lift a building"... Geological plate shifting moves frickin' CONTINENTS. It is a stupid comparison. It's like pretending that a jack hammer is the same thing as an earthquake... sure, if you limit your study to 3 feet.