This is mostly about the causal link they found. Earthquakes of that magnitude are very common also in traditional gas extraction. Many tiles in my parent's kit

This is mostly about the causal link they found. Earthquakes of that magnitude are very common also in traditional gas extraction. Many tiles in my parent's kitchen and bathroom can attest to that. Small earthquakes are not a very strong argument against fracking. Perhaps there is a risk of bigger ones. For geothermal energy they also inject water at high pressures (but deeper) and have caused earthquakes up to magnitude of 5.