Numerical simulation of seismo-electromagnetic fields associated with a   fault in a porous medium

doi:10.1093/gji/ggw144

CORC > 北京大学 > 地球与空间科学学院

	Numerical simulation of seismo-electromagnetic fields associated with a fault in a porous medium
	Ren, Hengxin ; Huang, Qinghua ; Chen, Xiaofei
刊名	GEOPHYSICAL JOURNAL INTERNATIONAL
	2016
关键词	Numerical solutions Magnetic anomalies: modelling and interpretation Magnetic and electrical properties Computational seismology Wave propagation POSSIBLE GENERATION MECHANISM LAYERED HALF-SPACE INTEGRAL EXPRESSION IZMIT EARTHQUAKE GREEN-FUNCTIONS ELASTIC-WAVES PACIFIC COAST WATER-CONTENT LOMA-PRIETA SIGNALS
DOI	10.1093/gji/ggw144
英文摘要	In this work, we carry out numerical simulations of the seismo-electromagnetic fields associated with a fault in a porous medium by considering the electrokinetic effect. In addition to porous materials, the adopted layered models comprise solid materials in which the electrokinetic effect is inoperative. First, sensitivity study is performed for the evanescent and direct radiation electromagnetic (EM) waves generated by a double couple point source embedded in a porous half-space below a solid half-space. Results suggest that both the evanescent and direct radiation EM waves are sensitive to some medium properties, for example porosity, salinity, fluid viscosity, and conductivity of solid layer. Then, adopting an eight-layer half-space model, we simulate the seismic and EM wavefields generated by the rupture process of a finite fault. It is shown that the electrokinetic effect is able to generate observable corupture EM signals, but the observability depends on some factors such as the epicentral distance, properties of the medium where the fault is located, and local activity levels of EM noise. Time synchronization coseismic EM signals are recorded when the receiver is close to the ground water level but located in a solid medium. In addition to the post-seismic electric field, our results also show the post-seismic magnetic field which has not been identified in previous simulation studies on the electrokinetic effect. The generation of the post-seismic magnetic field probably requires a sufficiently strong medium heterogeneity or fluid-pressure gradient.; National Natural Science Foundation of China [41274054, 41274053, 41274075]; SCI(E); EI; ARTICLE; renhx@ustc.edu.cn; 1; 205-220; 206
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437117]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Ren, Hengxin,Huang, Qinghua,Chen, Xiaofei. Numerical simulation of seismo-electromagnetic fields associated with a fault in a porous medium[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2016.
APA	Ren, Hengxin,Huang, Qinghua,&Chen, Xiaofei.(2016).Numerical simulation of seismo-electromagnetic fields associated with a fault in a porous medium.GEOPHYSICAL JOURNAL INTERNATIONAL.
MLA	Ren, Hengxin,et al."Numerical simulation of seismo-electromagnetic fields associated with a fault in a porous medium".GEOPHYSICAL JOURNAL INTERNATIONAL (2016).