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Many flaws in the Dallas Fort Worth region have the potential to host earthquakes, new studies


Austin, Texas – A study conducted by the University of Texas in Austin found that the majority of deficiencies under the auspices of the program were so sensitive to changes in print that they might slip over like those who had been hit by earthquakes in recent years.

Researcher in the United States Bureau of Economic Geology, Stanford University and Southern Methodist University have created a comprehensive map of more than 250 defects at a combined length of over 1,800 miles, some of which are widely populated in the Dallas Fortress area. Area. The study, published July 23 in the bulletin of the United States Seismological Society, found that the defects are relatively stable if they are unstable, but that wastewater injection, a practice that is often during oil and gas operations, increases the potential of Significantly, the defects have to be reduced. If not managed properly.

"This means that the entire system of defects is vulnerable," said Peter Hennings, an office researcher and the center's main appraiser for CISR.

A simplified version of the fault map created by the team of researchers. The map includes cases that are visible on the surface (green) and defects underground (black). The solid line indicates underground defects that researchers are able to map on a high resolution. The dotted line indicates defects mapped to a device resolution. According to the research, in the presence of wastewater injection activity, the majority of the defects in the area are as susceptible to sleep as the defects that have already occurred in earthquakes. The site also lists earthquake locations and locations and amounts for water injection. Credit: Hennings et al.

In the predicted basin, there was a large increase in seismic activity from 2008 to 2015 as oil and gas operations increased, but a significant reduction in earthquakes in the last four years as the injection slowed. Hennings said that it should be known that the nature of this fault system states that susceptible to potentially hostile earthquakes is susceptible in many areas, and that an upset in oil and gas production, which resulted in an increase in deep wastewater disposal, may also result in a disruption to Quake. Properly managed.

SMU professor and tutor Heather DeShon has noted that the largest earthquakes in the area have been the size 4, which is much less powerful than the major earthquakes that hit California earlier this month, but said the region had to prepare for it. Danger.

"The study provides key information to enable the public, citizen, federal government and industry to identify potential hazards and to identify effective public policy, regulations and mitigation strategies.

SMU compiled the earthquake history of the area – a step that identified the need for an updated fault site in the first place. Stanford has provided a site for the tectonic pressure in the area and the analysis methods used to determine fault sensitivity. UT developed the new fault map and lead the overall effort. The research also benefited from data provided by partners with petroleum industry.

The team also created maps that show the sensitivity of the defects. One shows that the defects in their natural geologic condition are relatively stable and not expected to slip if left undisturbed. Another map shows the impact of general pressure on the underground surface caused by waste water and reveals that it significantly reduces the likelihood of failure to slip.

"Industrial activities can increase the likelihood of triggering earthquakes before they happen to happen, but there are steps we can take to reduce the likelihood," said Jens-Erik Lund Snee, a doctoral student at Stanford University.

Stanford professor and co-author Mark Zoback added that while the research focused on the Dolphin Fort Worth area, it created a roadmap for those interested in exploring earthquake potential in other places.

Zoback said, "Methodology could be used in other areas where induced seismicity is a concern, but development activities are just beginning." So, creating a framework for making decisions in the future. "

Sysr and the Texnet seismological network managed by the UT Jackson School of Geosciences Bureau, played a key role in the research. TexNet is a collection of seismic cross-seeker across Texas that was authorized and funded by Texas Legacy and gave birth to abot. Since January 2017, seismic activity has been tracking across the state.

The study found that the forefront of basin is full of defects, many of them small in size, but susceptible to sleeping. The most is less than 6 miles long – a fact that emphasizes the importance of studying the area in detail with high-resolution data.

“Most of the slips that have slipped have not been recognized before; They find it very difficult to find, Hennings said. "We didn't identify all the defects in the area, but the new work is a big improvement over what was previously available."

The new maps are important tools for understanding the seismic risk of underlying the Dallas Fortress area, the most populated area in Texas. However, Hennings have said that they only provide a general overview. He said the team was working on a more in-depth analysis of personal defects that would give a fresh insight into the peculiar factors that influence seismic risk.

"In 2020, we will issue an updated version of the fault map and a comprehensive model that indicates the pressures that every earthquake has experienced from the waste water disposal," he said. "Combined with the current work, future research will give industry and our regulators powerful tools to use in managing risk and reducing risk."

/ Public release. Rather in view here.

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