Frackquakes are seismic activities or small earthquakes caused by fracking operations. Although drilling and pumping can cause vibrations that can be detected by seismographs, geologists worry that injecting wastewater (which includes used fracking fluid and other chemicals) back into tapped oil and gas plays (that is, the layers of rock in a particular area containing oil and gas) could alter pressure balances between layers of rock and lubricate faults in rock formations.
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