According to the USGS, 1-2% of induced earthquakes are caused by fracking. [0]
Apparently the rest of them are mostly caused by a similar process of injecting wastewater deep under ground. Of course, fracking is a major producer of wastewater, so it is therefore an indirect cause of many more than 1-2% of induced quakes.
Apparently the rest of them are mostly caused by a similar process of injecting wastewater deep under ground. Of course, fracking is a major producer of wastewater, so it is therefore an indirect cause of many more than 1-2% of induced quakes.
[0]https://earthquake.usgs.gov/research/induced/myths.php