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Despite the decrease in the number of such earth-shaking events last year, Pawnee, Okla., was rocked by a 5.8-magnitude earthquake, the state's largest ever recorded. In addition, the state logged the highest number of large earthquakes, of magnitude 4 or greater, USGS reported.
During the fracking process, waste water is collected and later disposed of by injecting it into deep underground wells at high pressure. That water fills pores in dormant faults, causing them to slip and unleash the quakes, according to the USGS.
The drop-off in earthquakes is a positive sign that "collaborative efforts between industry, scientists, and regulators are working," said Katie Brown, a spokesperson for Energy In Depth, a program of the Independent Petroleum Association of America, a trade group.http://www.usatoday.com/story/news/nation/2017/03/01/man-made-earthquakes-usgs-report-fracking/98579248/