Investigations of Ambient Noise Velocity Variations in a Region of Induced Seismicity near Greeley, Colorado Journal Article uri icon



  • Abstract; Wastewater injection has induced earthquakes in Northeastern Colorado since 2014. We apply ambient noise correlation techniques to determine temporal changes in seismic velocities in the region. We find no clear correlation between seismic velocity fluctuations and either injection volumes or seismicity patterns. We do observe apparent annual variations in velocity that may be associated with hydrologic loading or thermoelastic strain. In addition, we model uniform and vertically localized velocity perturbations, and measure the velocity change with 1D synthetic seismograms. Our results indicate that our methods underestimate the known velocity change, especially at shorter station distances and when variations are restricted to a horizontal layer. If injection does cause measurable velocity changes, its effect is likely diluted in cross correlations due to its localized spatial extent around injection wells.

publication date

  • January 1, 2023

has restriction

  • gold

Date in CU Experts

  • January 31, 2023 9:17 AM

Full Author List

  • Clifford T; Sheehan A; Moschetti MP

author count

  • 3

Other Profiles

International Standard Serial Number (ISSN)

  • 2694-4006

Additional Document Info

start page

  • 12

end page

  • 20


  • 3


  • 1