Reading paper here and came across this in an article about fracking;
Posted by
loyola
Mar 5 '14, 11:51
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" "Fracking can cause surface subsidence" is a third objection. Hydrocarbons are found at depths of thousands of meters. Fracking is confined to the reservoir rock, with each fracture stretching perhaps tens of meters. It is fanciful to imagine fractures can extend several kilometers up through multiple strata of solid rock until they reach the surface, and that pumping crews would be unaware of huge extra volumes vanishing down the hole. It can't happen. America's biggest bunker buster can blast through only 60 meters of concrete."
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