The speaker in that talk admitted that earthquakes are sometimes triggered by the underground injection of drilling fluids.
So it's not that actual fracking that is causing the noticeable increase in earthquakes in some areas. But when leftover drilling fluids and salt water from fracking operations or other types of oil and gas drilling are injected underground, that can trigger earthquakes.
They can only trigger earthquakes if there is already some kind of pressure build-up underground. One could argue that triggering quakes before the pressure increases to the point of letting off a natural quake decreases the intensity of the quake. Kind of like controlled burns help to decrease the damage of forest fires.
The moon’s gravitational pull triggers earthquakes, too.
another way of looking at it is the earth quake is going to happen anyway, this makes it smaller and more stable................
” But when leftover drilling fluids and salt water from fracking operations or other types of oil and gas drilling are injected underground, that can trigger earthquakes. “
And we can thank the EPA for that. Why do we not use something along the line of a concrete sanitation plant evaporation pit to just evaporate it and pick up the solids later?