100% this. Although it’s a chicken egg situation. There wouldn’t be near as much produced water without fracing since the wells wouldn’t have been drilled in the first place so no need to dispose of produced water. The injection of produced water typically pressures up and lubricates existing fault planes causing them to slip.
Technically it’s from water disposal, not fracking. Still oilfield, but it’s not the fracking that causes it.
https://www.usgs.gov/faqs/do-all-wastewater-disposal-wells-induce-earthquakes
100% this. Although it’s a chicken egg situation. There wouldn’t be near as much produced water without fracing since the wells wouldn’t have been drilled in the first place so no need to dispose of produced water. The injection of produced water typically pressures up and lubricates existing fault planes causing them to slip.