Allen Brooks often provides insightful comments here at JS.
Something the anti-frackers conveniently ignore is that fracking has been used extensively since 1947 with no major disasters. Something else they deliberately forget is the underground nuclear tests, ( a bit more powerful than fracking) that were conducted for 35 years, 835 detonations that left the proving ground looking like an overturned egg carton. But as extreme as they were, never caused a quake or any other natural disaster.
I try to put it another way–dirt as measured in cubic miles gets pretty heavy–how does a man made pressure create a tectonic force–ain’t sensible to think so–but the claims are made to scare the ignornat, like the politicians who propose fracking bans in places like Denton Texas or in Colorado or New Mexico.