Yale Environment 360: Fracking May Induce Quakes at Greater Distance than Previously Thought

Hydraulic fracturing and underground wastewater disposal may trigger earthquakes at tens of kilometers from the wells in which water is injected — a greater range than previously thought, according to new research from seismologists. In one case, an earthquake swarm in Oklahoma has been linked to a cluster of fracking injection wells up to 50 kilometers (31 miles) away, Cornell University researchers report. So-called “induced seismicity” — when human activity causes tremors in the earth’s crust — is gaining attention as reports of earthquakes within the central and eastern U.S. have increased dramatically over the past few years. The rise coincides with increased hydraulic fracturing for oil and natural gas, and the injection of wastewater in deep disposal wells in many locations, including Colorado, Oklahoma, and Texas. According to the U.S. Geological Survey (USGS), an average rate of 100 earthquakes per year above a magnitude 3.0 occurred in the three years from 2010-2012, compared with an average rate of 21 events per year observed from 1967-2000. The agency is trying to “stay agnostic as to whether the earthquakes are induced or natural,” says a USGS geophysicist, since, currently, it’s difficult to determine what triggers a particular event.

via Yale Environment 360: Fracking May Induce Quakes at Greater Distance than Previously Thought.

Author: Makere

A transplanted New Zealand Scots/Maori academic/grandmother/random singer and sometime activist, my life is shaped by a deep conviction of the necessity for active critical engagement in the multi-faceted global and local crises of being and survival of species that confront us in the 21st century, the urgency of re-visioning the meaning of thriving together, and the contribution of Indigenous knowledge systems to a truly sustainable and just global society.