Your link re-iterates what I've already stated above. The earthquakes are linked waste-water well injection, which is not hydraulic fracture.
The waste-water was generated at oil and gas sites, but it wasn't that process that caused the earthquakes. There are other ways to get rid of that water, and many states are starting to pass laws to take care of that issue.
Right, saw that and threw it in the post. Thanks for the education. The earthquakes in question, in OP.
However, fracking, done poorly, can be attributed to earthquakes. I guess, is the message?