Your browser doesn't support javascript.
loading
Injection-induced basement seismicity beneath the Raton Basin: constraints from refined fault architectures and basin structure.
Wang, Ruijia; Onyango, Evans A; Schmandt, Brandon; Worthington, Lindsay.
Afiliação
  • Wang R; Department of Earth and Space Sciences, Southern University of Science and Technology , Shenzhen, Guangdong, People's Republic of China.
  • Onyango EA; Department of Earth & Planetary Sciences, University of New Mexico , Albuquerque, NM, USA.
  • Schmandt B; Now at the Geophysical Institute, University of Alaska Fairbanks , Fairbanks, AK, USA.
  • Worthington L; Department of Earth & Planetary Sciences, University of New Mexico , Albuquerque, NM, USA.
Philos Trans A Math Phys Eng Sci ; 382(2276): 20230181, 2024 Aug 09.
Article em En | MEDLINE | ID: mdl-38945163
ABSTRACT
Intraplate earthquakes induced by anthropogenic fluid injection present unexpected seismic risk to previously quiescent or low seismicity-rate regions. Despite many studies of induced seismicity, there are relatively few with detailed openly accessible constraints on the interaction between seismic sources and subsurface structures. In this study of the Raton Basin, we refine source observations from a dense nodal array and constrain basin structure using teleseismic receiver functions. The cross-correlation-based relocated hypocentres and a new set of focal mechanisms light up active fault segments and show clear spatiotemporal patterns. The geometric complexity of reactivated fault clusters appears greatest near higher rate injection wells. Simpler normal fault structure is found farther from injection wells and near abrupt structural transitions suggested by receiver functions. While less induced seismicity in the crystalline basement is expected when injection is >1 km from the top of the basement (like Raton), our receiver function analysis identified a basin thickness ~3 km beneath the nodal array and lateral variations in sedimentary structures. Our results explain potential fluid connectivity between the injection depths focused at ~1-1.5 km below the surface and basement fault activity that begins at ~3 km and reaches peak activity at ~4-8 km depths. This article is part of the theme issue 'Induced seismicity in coupled subsurface systems'.
Palavras-chave

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article