Magnetotelluric Responses of Three-Dimensional Bodies in Layered Earths

Wannamaker, Philip E.; Hohmann, Gerald W.; Ward, S. H.

doi:10.1071/eg984190c

Cited by 85 publications

(119 citation statements)

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“…According to the results published by WANNAMAKER et al (1984), the xy components of the 3D response of geometrically regular, elongate prismatic conductors, along centrally located transverse profiles, are essentially the same as the TM components of the response of 2D bodies with identical cross sections. Therefore, an accurate modeling of such profiles can be made using 2D, TM algorithms.…”

Section: Model Bmentioning

confidence: 80%

Comparative Magnetotelluric Modeling of Smooth 2D and 3D Conducting Bodies Using Rayleigh-Fourier Codes

Martinélli

Osella

Pomposiello

2000

Pure and Applied Geophysics

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Recently, a method for 3D magnetotelluric modeling was developed, which is based on the application of the Rayleigh scattering theory. This method, RF-3D, is especially capable of modeling multilayered structures with smooth irregular boundaries. The formulation allows inclusion of layers with vertically anisotropic electrical conductivity.Using RF-3D, the response of smooth structures of practical interest is calculated and the importance of 3D effects is evaluated. Two models consisting of a 3D conductive body in the presence of a 2D shallow distortion are analyzed. In the first model, the direction of maximum elongation of the body is perpendicular to the strike direction of the 2D upper structure, and in the second one both directions coincide. In addition, the case of a small 3D shallow conductor over a regional 2D structure is also considered.3D effects are compared to those generated by 2D models with identical cross sections. In all the cases, the 3D responses differ from those of the 2D, especially directly over the bodies. A good agreement between the 2D transverse magnetic response and the corresponding components of the 3D response, along centrally located transverse profiles, is expected for elongate, prismatic conductors. Then, the differences obtained for the models considered in this study, particularly for the second and third models, are a consequence of the smooth geometry. They can be explained in terms of galvanic effects produced by boundary charges, which are greater near the vertical sides of a prism than on the sides of a body with smooth contours.Equivalent 2D models of the first and second structures are also obtained. In these models, the thickness of the conductor is underestimated, respectively, by about 30% and 24%. For the third model, when vertical anisotropy is analyzed, it is found that only the anisotropy of the first layer can be detected. This is because the effect of vertical anisotropy decreases strongly with depth and appears to be important only near the 3D anomaly.

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Section: Model Bmentioning

confidence: 80%

Comparative Magnetotelluric Modeling of Smooth 2D and 3D Conducting Bodies Using Rayleigh-Fourier Codes

Martinélli

Osella

Pomposiello

2000

Pure and Applied Geophysics

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“…Although the comparison of the observed and inversion model responses did not show any significant static shifts in the observed data, inversion is repeated with TE mode static shift as an inversion parameter as the TE mode is more prone to surface distortion effects (Wannamaker et al, 1984(Wannamaker et al, , 2002. This would allow the inversion to estimate the static shifts in the data, if any, to generate a reliable model.…”

Section: Mt Data Processing and Inversionmentioning

confidence: 95%

Hydrocarbon prospects across Narmada–Tapti rift in Deccan trap, central India: Inferences from integrated interpretation of magnetotelluric and geochemical prospecting studies

Azeez

Kumar

Basava

et al. 2011

Marine and Petroleum Geology

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“…Ledo et al (2002) discussed the limitation and validity of 2D interpretation of 3D magnetotelluric data; Wannamaker et al (1984) recommended TM mode when the profile crosses geometrically regular, elongate 3D structures centrally; Ledo (2006) emphasized that the 3D structures should parallel to the regional 2-D strike; Ogawa (2002) pointed out that it depends on the situation to select different modes to complex structures, as Berdichevsky et al (1998) concluded that the TM mode is more robust to the 3-D effects caused by conductive structures. In practical application, the TE mode data are insensitive to structural detail (Tauber et al, 2003), and they should be used with care (Unsworth et al, 2004).…”

Section: Synthetic Modelmentioning

confidence: 98%

Application of 2D magnetotelluric methods in a geological complex area, Xinjiang, China

Xiao¹,

Cai²,

Liang³

et al. 2011

Journal of Applied Geophysics

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Magnetotelluric Responses of Three-Dimensional Bodies in Layered Earths

Cited by 85 publications

References 0 publications

Comparative Magnetotelluric Modeling of Smooth 2D and 3D Conducting Bodies Using Rayleigh-Fourier Codes

Comparative Magnetotelluric Modeling of Smooth 2D and 3D Conducting Bodies Using Rayleigh-Fourier Codes

Hydrocarbon prospects across Narmada–Tapti rift in Deccan trap, central India: Inferences from integrated interpretation of magnetotelluric and geochemical prospecting studies

Application of 2D magnetotelluric methods in a geological complex area, Xinjiang, China

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