DeSmog

Ohio Geologists Link Earthquakes to Fracking, State Introduces Seismic Monitoring

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The Ohio Department of Natural Resources announced earlier this month that it will start requiring oil and gas companies to install networks of sensitive seismic monitors on their wells to detect small earthquakes that could be caused by hydraulic fracturing, or “fracking.” 

The special requirement will kick in if companies request permits to drill horizontal wells within three miles of known fault lines, or where earthquakes greater than a 2.0 magnitude have already been recorded. If the monitors detect any tremors in excess of 1.0 magnitude, drilling must cease while experts investigate the cause of the seismic activity. 

The new rules are the department’s response to recent earthquakes in Ohio’s Poland Township in Mahoning County — which Rick Simmers, chief of the Ohio Department of Natural Resource’s oil and gas division, says have a “probable connection” to hydraulic fracturing activity in the area.

The March earthquakes mark the first time state geologists in Ohio have definitively linked earthquakes to gas drilling. They believe that fracking for gas in the Utica Shale beneath the Appalachian mountains caused five earthquakes in the area by increasing pressure on a previously unknown fault. 

Ohio has also imposed an indefinite moratorium on new drilling in the area of the earthquakes, but will allow extraction to continue at five other existing wells at the site.

  
Image credit: Earthquake seismograph via Shutterstock.

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