I actually was looking for it. Looks like either my sleuthing skills have declined, or the articles have been disappeared. I do remember they sent someone to prison for it, one of the lead engineers.
If you find later, I would be interested.
Every time I’ve looked past the headline I’ve found that (like this article) they don’t actually claim hydraulic fracturing caused it, but rather waste water disposal wells.
Hydraulic fracturing uses water and it is often disposed of in these wells, but most normal oil production has associated water production and it is also sent down these wells.
My guess is, the hydraulic fracturing in some areas has resulted in too much water for a few individual wells. The water can either be distributed out over more wells and more area (and more cost) or some have set up recycling systems (at even more cost).
The result is no one I’ve found that actually investigated claims the hydraulic fracturing cause the quake, but the disposal off the water is reasonably assumed to have effected the cause of the earthquakes.