Hydraulic fracturing operations such as this one produce waste fluids that are pumped back below ground. Sometimes this fluid triggers earthquakes. Credit: Joshua Doubek (CC BY-SA 3.0)

Hydraulic fracturing operations such as this one produce waste fluids that are pumped back below ground. Sometimes this fluid triggers earthquakes. Credit: Joshua Doubek (CC BY-SA 3.0)

Hydraulic fracturing operations such as this one produce waste fluids that are pumped back below ground. Sometimes this fluid triggers earthquakes. Credit: Joshua Doubek (CC BY-SA 3.0)

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