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Earthquakes are moving northeast in Midland Basin of Texas, scientists find

May 6, 2024
in Science
Earthquakes are moving northeast in Midland Basin of Texas, scientists find
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Earthquakes Are Moving Northeast in Midland Basin of Texas

A TexNet seismic monitoring station. Hundreds of these stations are constantly monitoring seismic activity across Texas. Credit: Bureau of Economic Geology / The University of Texas at Austin

After analyzing seven years of earthquake data from the Midland Basin, a team of scientists at The University of Texas at Austin has found that seismic activity is probably on the move northeast toward the community of Big Spring.

Although most past quakes happened in the southwest region near Odessa and Midland, the researchers have identified a seismicity trend moving along a newly identified and extensive seismogenic fault zone stretching toward the northeast edge of the basin.

“The fault zone has been activated, and it has the capability to trigger additional earthquakes that can be felt by humans, especially because it’s so close to major cities along Interstate 20,” said Dino Huang, a research assistant professor at the Jackson School of Geosciences who led the research.

The results were published in the journal Seismological Research Letters.

The study is based on data collected by TexNet, a statewide seismic monitoring network operated by the Bureau of Economic Geology, a research unit of the Jackson School. From January 2017 to November 2023, TexNet recorded 1,305 earthquakes in the area, the vast majority of them very small and causing no damage.

The TexNet seismometers detect earthquakes by recording the ground motion caused by seismic activity. The researchers used this data to determine the depth, location and orientation of geologic faults—large cracks under the ground where earthquakes can occur—using a technique called a passive seismic analysis. Unlike active seismic analysis, this technique does not require manually firing a seismic energy source, such as an air gun, to explore the underground fault structures.

Earthquakes are moving northeast in Midland Basin of Texas

A composite figure showing the seismic landscape of the Midland Basin from 2017-2023. Researchers from The University of Texas at Austin recently described earthquake-generating structures and zones in the region. The research shows that earthquakes appear to be moving northeast toward the edge of the basin along a rift structure. The figure shows induced seismicity (gray crosses), large earthquakes of Magnitude 4 or higher (light blue stars), a subsurface structure the researchers think is a rift (pink dashes), and earthquake producing zones (numbered green boxes). A dark blue star marks the location of the Range Hill event, a Magnitude 5.2 earthquake that occurred on Nov. 16, 2022. After the event, two earthquake swarms (denoted by two black circles) occurred in March and November 2023 (labeled A and B, respectively), suggesting that earthquake swarms have migrated northeastward. The earthquake cluster near Snyder is outside the scope of the Midland Basin study but is currently being studied by the scientists. Credit: Dino Huang, et al. / Jackson School of Geosciences

The analysis allowed the researchers to piece together previously unmapped parts of the Midland Basin fault system. Major features include what looks like a rift structure stretching across the middle of the basin in the deep basement rock that is slowly widening over time. This rift structure is surrounded on either side with a complex network of smaller faults.

Within this fault system, the researchers identified 15 distinct earthquake-producing zones—places where earthquakes have already occurred and where the quakes can be traced back to common sources of stress in the subsurface. The researchers then combined the data on earthquake frequency and magnitude from all the zones to determine the future seismic potential of the entire Midland Basin—that is, the potential for future earthquakes to occur.

Using statistical analysis of TexNet data, the researchers determined that the basin seismicity has elevated since 2018. Although this potential indicates that the basin has a higher likelihood of future earthquakes compared with earthquake risk before 2018, it does not provide insight into future earthquake frequency, magnitude or when they might strike. However, based on recent seismic activity, the researchers have an idea of which zones will be more prone to earthquakes in the future.

The team hypothesizes that a 5.2 magnitude quake that struck Range Hill in 2022, which is in zone 6 and northwest of the city of Midland, introduced additional stress into the fault system that has propagated northeastward along the same path as the rift structure revealed by their passive seismic analysis. The scientists expect more quakes to happen in zones 6-8, northwest of the cities of Big Spring and Stanton, as the stress travels through the fault system.

The researchers point to two recent earthquakes in zone 8—a 3.7 magnitude and a 3.8 magnitude that occurred in March and November of 2023—as evidence for their hypothesis.

The Midland Basin is one of the major hubs for oil and gas extraction in Texas. Over time, the injection of wastewater from these operations into the subsurface has introduced stress along faults that has triggered earthquakes. According to the researchers, data from TexNet is helping them understand that state of stress on the fault system and how to mitigate induced seismicity associated with it. Also, knowing which regions where earthquakes are more likely to occur can help operators make adjustments to wastewater injection operations to keep stress low and the basin productive.

TexNet manager and research professor Alexandros Savvaidis and research assistant professor Yangkang Chen are co-authors of the study.

More information:
Guo-chin Dino Huang et al, Complex Seismotectonic Characteristics in the Midland Basin of Texas: Constrained by Seismicity and Earthquake Source Mechanisms, Seismological Research Letters (2024). DOI: 10.1785/0220230269

Citation:
Earthquakes are moving northeast in Midland Basin of Texas, scientists find (2024, May 6)
retrieved 6 May 2024
from https://phys.org/news/2024-05-earthquakes-northeast-midland-basin-texas.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Phys.org – https://phys.org/news/2024-05-earthquakes-northeast-midland-basin-texas.html

Tags: EarthquakesMovingscience
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