Effect of fracking on earthquakes raises concern | syracuse.com: "Las month, Oklahoma experienced its largest earthquake. Earthquakes take place when two conditions occur: 1) there is a change in pressure or balance along a fault; and 2) water “lubricates” the fault, causing it to quake. Fracking sets up both conditions.
Oklahoma’s fault is lies near many hydraulic fracking wells. Fracking to remove gas can change the pressure balance. Fracking itself explosively injects millions of gallons of water mixed with chemicals into rock layers, turning them into an oily slurry. If that liquid mix gets to and follows a fault line, it can have an effect similar to taking an enema.
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