Published In
Journal of Geophysical Research: Solid Earth
Document Type
Article
Publication Date
2020
Subjects
Geology -- Texas, Seismology -- Earthquakes
Abstract
In recent years, numerous small earthquakes have occurred near the town of Pecos in West Texas; however, when this activity began and whether it was caused by increased petroleum industry activity has been uncertain because prior to 2017 there were few permanent seismograph stations in the region. We identify and locate earthquakes using data recorded since 2000 at TXAR, a sensitive 10‐station seismic array situated about 240 km south of Pecos. We thus show that in 2007, one earthquake occurred near Pecos, in 2009 several more occurred, and subsequently, activity has increased considerably, with more than 2000 events identified in 2017. A time‐of‐day and year‐by‐year analysis identifies geographic areas in West Texas where events are likely to be natural earthquakes and quarry blasts. However, for the Pecos events, annual seismicity rates increase along with annual volumes of petroleum production and fluid waste disposal, suggesting a causal link. Analysis of seismograms collected by the EarthScope Transportable Array indicates that the 2009 earthquakes had focal depths of 4.0–5.2 km below sea level, within or just below strata where petroleum is produced and/or wastewater is injected. The largest earthquake to date had magnitude ML3.7, but the recent high activity rates suggest that greater magnitudes may be possible. For the years 2000–2017, we provide a catalog of 10,753 epicenters of seismic events recorded at TXAR.
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DOI
10.1029/2019JB017737
Persistent Identifier
https://archives.pdx.edu/ds/psu/33025
Citation Details
Frohlich, C., Hayward, C., Rosenblit, J., Aiken, C., Hennings, P., Savvaidis, A., ... & DeShon, H. R. (2020). Onset and Cause of Increased Seismic Activity Near Pecos, West Texas, United States, From Observations at the Lajitas TXAR Seismic Array. Journal of Geophysical Research: Solid Earth, 125(1), e2019JB017737.
Description
©2019. The Authors.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.