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

Miao,Miao1,2,3; Shoubiao,Zhu2; Ying,Chang1; Jie,Yuan2,4; Rui,Wang1; Peng,Han1

2021-11-01

10.1029/2021EA001837

Earth and Space Science   影响因子和分区

2333-5084

2333-5084

Spatial distribution of aftershocks has been explained by the co-seismic static Coulomb Failure Stress changes (Delta CFS) 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 Delta CFS 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 Delta CFS based on the fully coupled poroelastic theory. The strike-slip, reverse, and normal faulting models were investigated separately. The patterns of co-seismic Delta CFS 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.

fluid-solid coupling pore pressure change static Coulomb stress evolution numerical modeling

SCI

英语

第一 ; 通讯

National Key Research & Development Program of China[2018YFC1504204] ; National Natural Science Foundation of China[41804049,41790465]

Astronomy & Astrophysics ; Geology

Astronomy & Astrophysics ; Geosciences, Multidisciplinary

WOS:000722485800007

American Geophysical Union (AGU)

人工提交

1.Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China
2.National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, China
3.University of Science and Technology of China, Hefei, China
4.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China

Miao,Miao,Shoubiao,Zhu,Ying,Chang,et al. Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes[J]. Earth and Space Science,2021,8(11).

Miao,Miao,Shoubiao,Zhu,Ying,Chang,Jie,Yuan,Rui,Wang,&Peng,Han.(2021).Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes.Earth and Space Science,8(11).

Miao,Miao,et al."Spatiotemporal Evolution of Pore Pressure Changes and Coulomb Failure Stress in a Poroelastic Medium for Different Faulting Regimes".Earth and Space Science 8.11(2021).