Weatherford Democrat

Aledo ExtrA

December 16, 2013

RRC commish says there will be local quake discussion

By CHRISTIN COYNE

The Texas Railroad Commission, which regulates the oil and gas industry in Texas and has been asked by local officials to look into whether oil and gas activity may be behind the recent swarm of earthquakes in the Parker County area, may soon ask an outside entity to study the issue.

RRC Chairman Barry Smitherman, campaigning in Weatherford Thursday for the position of Texas Attorney General, told the Democrat he was aware of the recent earthquakes in the Parker County area.

Twenty-six earthquakes have shaken North Texas since Nov. 1, including 21 in the area of Azle and Reno and three north of Mineral Wells. The earthquakes have ranged in magnitude from 2.2 to 3.7, with the latest occurring Tuesday morning.

“We’ve asked our staff to take a look at that, and they’re embarking upon that right now,” Smitherman said. “I think what we’re going to do is in the near future we’re going to have a town hall meeting here and we’ll gather more evidence and have people share their experiences with us and then we’ll probably ask, say the University of Texas’ Bureau of Economic Geology or someone else qualified and experienced, to do a study of the issue.”

“But it is something we are aware of and want to take a good look at,” Smitherman said.

At the request of Parker County commissioners, Parker County Judge Mark Riley sent a letter last week to the RRC requesting the state look into any possible connection between the earthquakes and injection wells and provide the county and general public with any information they obtain.

Southern Methodist University in Dallas is also attempting to collect better data and study the issue. The university announced this week that they are placing a variety of seismic monitoring equipment from the U.S. Geological Survey and Incorporated Research Institutions for Seismology and other sources around Azle and Reno to get a better handle on where the earthquakes are occurring.

If the earthquakes are occurring near injection wells, they plan to study that potential link, according to the head of the research team.  

A group of SMU and University of Texas at Austin researchers have produced two studies since 2009 indicating a possible link between the outbreaks of small earthquakes in North Texas’ Barnett Shale area since 2008 and some injection wells used to dispose of oil and gas drilling waste.

Though the USGS says studies suggest that the actual hydraulic fracturing process is rarely the direct cause of felt earthquakes, U.S. geologists say activities that have induced felt earthquakes in some geologic environments have included impoundment of water behind dams, injection of fluid into the earth’s crust, extraction of fluid or gas, and removal of rock in mining or quarrying operations.

In the south-central states of the U.S., a significant majority of recent earthquakes are thought by many seismologists to have been human-induced, according to a statement posted on the USGS website below information on the recent local earthquakes.

According to the USGS, wastewater disposal appeared to have induced the 5.6-magnitude earthquake in central Oklahoma in 2011 that damaged more than a dozen homes.

The average number of magnitude-3.0 or larger earthquakes that occurred each year from 1975 to 2008 in the Oklahoma City region was one to three, according to the team of U.S. geologists studying the issue. However, since 2009, that average has grown to around 40 earthquakes per year.

State geologists, however, disagreed. The Oklahoma Geological Survey laid out reasons they believe the earthquakes were due to natural causes.

State Rep. Phil King told the Mineral Wells Index that he was skeptical that oil and gas activity may be prompting the earthquakes.

Concerned that the environmental community would try to use the issue to shut down oil and gas production in North Texas, King said he is insistent that there be definitive scientific evidence, rather than just correlations and rhetoric.

 

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