What is the primary reason fracking contributes to Earthquakes?
The continued pumping of wastewater into rock formations causes the water pressure in the pores of the rocks to build up, causing the rocks to expand. These expanding rock layers push against existing faults in the Earth's crust, lubricating them and causing them to slip and produce Earthquakes.
The boring through the uppermost crust of the lithosphere creates a new geological fault line. When the fracking water is injected into the subterranian rock layers, the pressurized water gravitates toward the new fault line and causes it to "blow", leading to an Earthquake.
The pumping of the injection well wastewater used for fracking dissolves the rock layers, causing the bedrock to erode. This, in turn, creates an empty space underground and there is nothing to hold up the upper layers of rock. Thus, the upper mantle caves in, similar to asinkhole, causing an Earthquake.
Fracking uses a lot of heavy equipment that creates significant vibrational stress on the fragile rock layers in which oil and natural gas are found. After time, the continued streaa on these layers causes them to collapse, causing Earthquakes.
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