A map of the stations used by PASEIS to collect seismic data (click for larger version)
Do you know how many Marcellus (or Utica) shale wells have been drilled in Pennsylvania since shale drilling began? We're talking drilled, fracked and now online. That number is now over 9,000. You know how many times fracking has caused an earthquake (or "seismic event" as it's called in the biz)? Precisely once. Which is statistically zero. The Pennsylvania State Seismic Network (PASEIS) keeps track of these things, and that's what they say. One fracking-induced "event" that happened back in April 2016.
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