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Injection-induced basement seismicity beneath the Raton Basin: constraints from refined fault architectures and basin
Ruijia Wang1, Evans A Onyango2,3, Brandon Schmandt2
1Department of Earth and Space Sciences, Southern University of Science and Technology , Shenzhen, Guangdong, People's Republic of China.
Summary
Anthropogenic fluid injection can trigger earthquakes in new areas. This study links injection wells to fault complexity and seismic activity in the Raton Basin, revealing fluid connectivity to deeper basement faults.
Area of Science:
- Geophysics
- Seismology
- Earthquake Science
Background:
- Induced seismicity from fluid injection poses risks to low-seismicity regions.
- Limited studies provide detailed constraints on seismic sources and subsurface structures.
Purpose of the Study:
- To refine seismic source observations and constrain subsurface structures in the Raton Basin.
- To investigate the relationship between fluid injection and fault reactivation.
Main Methods:
- Utilized a dense nodal seismic array for refined hypocenter relocation.
- Employed teleseismic receiver functions to constrain basin structure.
- Analyzed cross-correlation-based hypocenters and focal mechanisms.
Main Results:
- Identified active fault segments with clear spatiotemporal patterns.
- Observed increased fault complexity near high-rate injection wells.
- Mapped basin thickness and sedimentary structure variations.
Conclusions:
- Fluid injection influences fault reactivation and complexity in the Raton Basin.
- Established potential fluid connectivity from injection depths to basement faults.
- Provided crucial constraints for understanding induced seismicity in coupled subsurface systems.
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