Investigations of ambient noise velocity variations in a region of induced seismicity near Greeley, Colorado
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Investigations of ambient noise velocity variations in a region of induced seismicity near Greeley, Colorado |
| Series title | The Seismic Record |
| DOI | 10.1785/0320220033 |
| Volume | 3 |
| Issue | 2 |
| Year Published | 2023 |
| Language | English |
| Publisher | Seismological Society of America |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | 9 p. |
| First page | 12 |
| Last page | 20 |
| Country | United States |
| State | Colorado |
| City | Greeley |
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