Seismicity of the rocky mountains and Rio Grande Rift from the EarthScope Transportable Array and CREST temporary seismic networks, 2008-2010
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Seismicity of the rocky mountains and Rio Grande Rift from the EarthScope Transportable Array and CREST temporary seismic networks, 2008-2010

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  • Journal Title:
    Journal of Geophysical Research: Solid Earth
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  • Description:
    We developed a catalog of small magnitude ( ML/C00.1 to 4.7) seismicity across Colorado and New Mexico from the EarthScope USArray Transportable Array and CREST (Colorado Rocky MountainsExperiment and Seismic Transects) seismic networks from 2008 to 2010 to characterize active deformationin the Rio Grande Rift. We recorded over 900 earthquakes in the Rio Grande Rift region, not includinginduced earthquakes and mine blasts, and find that the rift is actively deforming both broadly and in distinct regions. Seismic events that are likely induced, mostly in the Raton Basin, make up 66% of thecatalog (1837 earthquakes). Neogene faults in the northern rift in north central Colorado are seismicallyactive in the North Park Basin and northwestern Colorado. The central rift from the San Luis Basin(southern Colorado) to south of the Socorro Magma Body is the most seismically active rift region, andseismicity delineates the deformation in the Colorado Plateau transition zone, which is spatially correlatedwith volcanic vents, dikes, and faults within the western Jemez Lineament. The eastern Jemez Lineament isnearly aseismic and surrounded by a halo of seismicity culminating in boundaries de fined by recent moderate ( M w3.9 and Mw3.3) earthquakes. The southern rift is characterized by diffuse seismicity in Texas and Mexico. This study provides an updated seismic catalog built with uniformity in seismometer coverage and low epicentral uncertainties (~2 km) that allows for regional evaluation of seismicity. During thistime period, clusters of seismicity and moderate magnitude earthquakes characterize deformation in alow-strain rate extensional environment.
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    Journal of Geophysical Research: Solid Earth (2017)
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  • ISSN:
    2169-9313
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