(Natural Blaze) A new analysis of historical seismic data led by The University of Texas at Austin has found that earthquake activity in West Texas near the city of Pecos has increased dramatically since 2009.
by Staff Writer, November 4th, 2019
The study, published Nov. 4 in the Journal of Geophysical Research: Solid Earth, is important because it leverages old, unmined data to track seismic activity over nearly 20 years — much further back than other studies — to show that activity has increased during the past decade in an area of the Permian Basin that is being heavily developed for oil and gas.
Although researchers have generally thought that to be true, the statewide TexNet earthquake monitoring system has been gathering data since only 2017, making it impossible to definitely determine when the cluster of seismic activity around Pecos really began.
The researchers were able to extend the seismic record of the area by turning to the older TXAR system near Lajitas, Texas, about 150 miles to the south. TXAR is an array of 10 seismographs installed in the 1990s by scientists at Southern Methodist University (SMU) to help track nuclear testing across the world, said lead author Cliff Frohlich, a senior research scientist emeritus at the University of Texas Institute for Geophysics (UTIG).
“Especially for these West Texas earthquakes, we would like to get some information about when they started,” Frohlich said. “I really saw this as a way to bridge the gap before TexNet.”
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The TXAR system is some distance from Pecos, but Frohlich said the equipment is highly sensitive and that the area is remote and seismically very quiet, making the system perfect for picking up vibrations from explosions across the world or from earthquakes 150 miles away.
Frohlich and SMU scientist Chris Hayward developed a method to derive the earthquake data from the international data TXAR collects and build an earthquake catalog for the Delaware Basin near Pecos from 2000 to 2017.
By analyzing the data, scientists were able to document more than 7,000 seismic events near Pecos that were determined by the team to be earthquakes. Multiple events first started occurring in 2009, when 19 earthquakes of at least magnitude 1 were documented. The rate increased over time, with more than 1,600 earthquakes of magnitude 1 or greater in 2017. Most were so small that no one felt them.
The study shows a correlation between earthquake activity in the area and an increase in oil and gas activity, but it does not make an effort to directly tie the two together as other studies have done.
“West Texas now has the highest seismicity rates in the state,” said co-author and SMU Associate Professor Heather DeShon. “What remained uncertain is when the earthquakes actually started. This study addresses that.”
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