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Answers on link between injection wells and quakes

Published on NewsOK Modified: July 14, 2014 at 4:58 pm •  Published: July 14, 2014

FORT WORTH, Texas (AP) — States where hydraulic fracturing is taking place have seen a surge in earthquake activity, raising suspicions that the unconventional drilling method could be to blame, especially the wells where the industry disposes of its wastewater.

Fracking generates vast amounts of wastewater, far more than traditional drilling methods. The water is pumped into injection wells, which send the waste thousands of feet underground. No one knows for certain exactly what happens to the liquids after that. Scientists wonder whether they could trigger quakes by increasing underground pressures and lubricating faults.

Oklahoma has recorded nearly 250 small-to-medium earthquakes since January, according to statistics kept by the U.S. Geological Survey. That's close to half of all the magnitude 3 or higher earthquakes recorded this year in the continental United States.

A study published earlier this month in the journal Science suggests that just four wells injecting massive amounts of drilling wastewater into the ground are probably shaking up much of the state, accounting for one out of every five quakes from the eastern border of Colorado to the Atlantic coast.

Another concern is whether injection well operators could be pumping either too much water into the ground or pumping it at exceedingly high pressures.

Most of the quakes in areas where injection wells are clustered are too weak to cause serious damage or endanger lives. Yet they've led some states, including Ohio, Oklahoma and California, to introduce new rules compelling drillers to measure the volumes and pressures of their injection wells as well as to monitor seismicity during fracking operations.

Here are some answers to key questions about the phenomenon:



A: Researchers are still debating the appropriate parameters for measuring the link between injection wells and earthquakes, including at what distances injections can possibly stimulate quakes. Previously seismologists had linked injection wells to earthquakes occurring within 3 miles of injection sites, but a new study tracks earthquakes as far as 20 miles away from wells.



A: No injuries or deaths have been reported, but there has been varying degrees of property damage. Most of the quakes are big enough to be felt but too small to do damage like classic California or Japanese quakes. In the North Texas city of Azle, which has endured hundreds of small earthquakes since fracking and injection well activity began, residents have reported sinkholes, cracks in the walls of homes and air and water quality concerns. Two structures collapsed during Oklahoma's 5.7-magnitude earthquake in 2011.

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