Electromagnetic field generated by a finite fault due to electrokinetic effect

Hu, Hengshan; Gao, Yongxin

doi:10.1029/2010jb007958

Cited by 76 publications

(61 citation statements)

References 55 publications

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“…Not only they were able to observe SE conversions on the field, but also the numerical simulations qualitatively reproduced the observations. In Hu and Gao (2011), an extension to this algorithm is performed including a moment tensor point source. In this way, electromagnetic fields induced by a finite fault rupture are studied.…”

Section: -D Response Of Stratified Mediamentioning

confidence: 99%

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

Jouniaux

Zyserman

2016

Solid Earth

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Abstract. The seismo-electromagnetic method (SEM) can be used for non-invasive subsurface exploration. It shows interesting results for detecting fluids such as water, oil, gas, CO 2 , or ice, and also help to better characterise the subsurface in terms of porosity, permeability, and fractures. However, the challenge of this method is the low level of the induced signals. We first describe SEM's theoretical background, and the role of some key parameters. We then detail recent studies on SEM, through theoretical and numerical developments, and through field and laboratory observations, to show that this method can bring advantages compared to classical geophysical methods.

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Section: -D Response Of Stratified Mediamentioning

confidence: 99%

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

Jouniaux

Zyserman

2016

Solid Earth

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“…To explain the earthquake‐associated EM signals, Gao and Hu [] developed an algorithm similar to Haartsen and Pride [] by introducing moment tensor sources and simulated the EM signals generated by an earthquake. Hu and Gao [] extended the work by Gao and Hu [] to simulate the EM responses to a finite fault rupture. Ren et al .…”

Section: Introductionmentioning

confidence: 99%

Comparison of full and quasi‐static seismoelectric analytically based modeling

Gao

Huang

2017

JGR Solid Earth

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Quasi‐static electromagnetic (EM) approximation was frequently used in numerical modeling of the seismoelectric wavefields, but the computational error it brings is unclear. In this study, we investigate the error caused by the quasi‐static EM approximation based on a horizontally layered model. With such an approximation we obtain a simplified set of Pride's equations and present an analytically based algorithm to solve the seismoelectric responses to an explosive source. First, we solve the seismic wavefields by ignoring the influence of the converted EM fields on the propagation of the seismic waves. Second, we simplify Maxwell equations to a Poisson equation of the electric potential, from which the EM signals are solved. The solved EM signals are compared with the solutions solved from the full Pride's equations to investigate the error caused by the quasi‐static EM approximation. The result shows that the quasi‐static EM approximation causes the loss of the electric field accompanying the S waves and yields errors in modeling the coseismic magnetic fields accompanying the S waves. The errors tend to become smaller when increasing the frequency and decreasing the salinity, implying that the quasi‐static EM approximation seems to be more suitable for simulating the coseismic EM signals under high‐frequency and low‐salinity conditions. The quasi‐static EM approximation also affects the simulation of the interfacial EM waves. Only under the condition that the wavelength of the EM wave is much larger than the source‐receiver distance, the quasi‐static method is valid in simulating the EM wave.

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“…This is not entirely correct for the coupled seismic and electromagnetic model, because the influence of a force acting on the fluid should also be incorporated in the response to a moment tensor. They continued to model the response of a homogeneous halfspace in which a finite fault generated a seismoelectromagnetic response (Hu and Gao, 2011). Here we give a proper source model that can be used as a source mechanism for earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Seismoelectromagnetic homogeneous space Green’s functions

Slob

Mulder

2016

GEOPHYSICS

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We present explicit expressions and the corresponding computer code for all homogeneous space Green's functions for coupled electromagnetic fields and poroelastic waves. The Green's functions are derived from the basic equations in closed-form in wavenumber-frequency and in space-frequency domains. They are given for point sources of any type. This adds several Green's functions to what has been published before. These Green's functions can be used in integral equation formulations, for numerical model validation, and for studying earthquake related electrokinetic effects. The wavenumber domain code for all Green's functions is given with the numerical test on the basic equations to demonstrate correctness. The numerical codes to compute them in space-frequency domain are also given. Numerical inverse FFT routine is used to provide space-time domain results. At seismic frequencies the fast P-wave is radiated with the largest amplitude in all fields, except for the magnetic fields where no P-waves are generated. At ultrasonic frequencies and in the particle and filtration velocity fields generated by an electric current source the slow P-wave has the strongest amplitude. In the filtration velocity and particle velocity the slow P-wave is, respectively, three orders and one order of magnitude stronger than the fast P-wave.

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Electromagnetic field generated by a finite fault due to electrokinetic effect

Cited by 76 publications

References 55 publications

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

Comparison of full and quasi‐static seismoelectric analytically based modeling

Seismoelectromagnetic homogeneous space Green’s functions

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