I'm seeing a lot of folks making a connection between hydraulic fracturing in the US and this earthquake. In fact, the earthquakes in Oklahoma were caused by waste water wells:
https://en.m.wikipedia.org/wiki/Injection_well
Fracking is happening all over the US (Appalachians, the Dakotas, Texas), but for some reason Oklahoma only gets the quakes. I think it's because only Oklahoma has these bad wastewater wells. Apologies, can't find the sources I found a few years ago that convinced me of this.
Yes, waste water is the larger cause of these induced quakes. However, fracking produces a significant amount of wast water, so they indirectly contribute to induced quakes in that way as well.
Fracking is happening all over the US (Appalachians, the Dakotas, Texas), but for some reason Oklahoma only gets the quakes. I think it's because only Oklahoma has these bad wastewater wells. Apologies, can't find the sources I found a few years ago that convinced me of this.