Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes

Abstract Spatial distribution of aftershocks has been explained by the co‐seismic static Coulomb Failure Stress changes (ΔCFS) to some extent. In practice, the earth's crust is porous medium saturated with fluid filling pores, cavities, cracks, and faults. The pore fluid flow plays an important...

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Autores principales:	Miao Miao, Shoubiao Zhu, Ying Chang, Jie Yuan, Rui Wang, Peng Han
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	fluid‐solid coupling pore pressure change static Coulomb stress evolution numerical modeling Astronomy QB1-991 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/d00b210a36514ef9badd24fc1e846c82
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spelling	oai:doaj.org-article:d00b210a36514ef9badd24fc1e846c822021-11-23T21:03:07ZSpatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes2333-508410.1029/2021EA001837https://doaj.org/article/d00b210a36514ef9badd24fc1e846c822021-11-01T00:00:00Zhttps://doi.org/10.1029/2021EA001837https://doaj.org/toc/2333-5084Abstract Spatial distribution of aftershocks has been explained by the co‐seismic static Coulomb Failure Stress changes (ΔCFS) to some extent. In practice, the earth's crust is porous medium saturated with fluid filling pores, cavities, cracks, and faults. The pore fluid flow plays an important role in the evolution of the stress field in porous medium of the earth. The ΔCFS can be influenced by the co‐seismic pore pressure changes and the post‐seismic pore fluid flow. In order to understand such impacts, we built 3D fault‐slip finite element models to study the evolution of the pore pressure changes and the ΔCFS based on the fully coupled poroelastic theory. The strike‐slip, reverse, and normal faulting models were investigated separately. The patterns of co‐seismic ΔCFS were similar to the elastic stress changes on a homogeneous half‐space, but there were considerable differences in details especially in the near‐fault area when considering co‐seismic pore pressure change. Due to post‐seismic pore fluid flow, the near‐field stress shadow narrowed gradually in the strike‐slip model. In the reverse faulting model, both the near‐field stress shadow and enhanced areas expanded. In the normal faulting model, the stress shadow near the epicenter reduced. The pore pressure changes decayed sharply at the beginning and then gradually approached to zero because the system evolves to drained conditions. These results can help us to understand the effect of pore fluid flow on Coulomb Failure Stress evolution and might improve the understanding of earthquake triggering and aftershock forecasting.Miao MiaoShoubiao ZhuYing ChangJie YuanRui WangPeng HanAmerican Geophysical Union (AGU)articlefluid‐solid couplingpore pressure changestatic Coulomb stress evolutionnumerical modelingAstronomyQB1-991GeologyQE1-996.5ENEarth and Space Science, Vol 8, Iss 11, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fluid‐solid coupling pore pressure change static Coulomb stress evolution numerical modeling Astronomy QB1-991 Geology QE1-996.5
spellingShingle	fluid‐solid coupling pore pressure change static Coulomb stress evolution numerical modeling Astronomy QB1-991 Geology QE1-996.5 Miao Miao Shoubiao Zhu Ying Chang Jie Yuan Rui Wang Peng Han Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes
description	Abstract Spatial distribution of aftershocks has been explained by the co‐seismic static Coulomb Failure Stress changes (ΔCFS) to some extent. In practice, the earth's crust is porous medium saturated with fluid filling pores, cavities, cracks, and faults. The pore fluid flow plays an important role in the evolution of the stress field in porous medium of the earth. The ΔCFS can be influenced by the co‐seismic pore pressure changes and the post‐seismic pore fluid flow. In order to understand such impacts, we built 3D fault‐slip finite element models to study the evolution of the pore pressure changes and the ΔCFS based on the fully coupled poroelastic theory. The strike‐slip, reverse, and normal faulting models were investigated separately. The patterns of co‐seismic ΔCFS were similar to the elastic stress changes on a homogeneous half‐space, but there were considerable differences in details especially in the near‐fault area when considering co‐seismic pore pressure change. Due to post‐seismic pore fluid flow, the near‐field stress shadow narrowed gradually in the strike‐slip model. In the reverse faulting model, both the near‐field stress shadow and enhanced areas expanded. In the normal faulting model, the stress shadow near the epicenter reduced. The pore pressure changes decayed sharply at the beginning and then gradually approached to zero because the system evolves to drained conditions. These results can help us to understand the effect of pore fluid flow on Coulomb Failure Stress evolution and might improve the understanding of earthquake triggering and aftershock forecasting.
format	article
author	Miao Miao Shoubiao Zhu Ying Chang Jie Yuan Rui Wang Peng Han
author_facet	Miao Miao Shoubiao Zhu Ying Chang Jie Yuan Rui Wang Peng Han
author_sort	Miao Miao
title	Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes
title_short	Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes
title_full	Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes
title_fullStr	Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes
title_full_unstemmed	Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes
title_sort	spatiotemporal evolution of pore pressure changes and coulomb failure stress in a poroelastic medium for different faulting regimes
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/d00b210a36514ef9badd24fc1e846c82
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_version_	1718416122005422080

Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes

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