Model of Electrical Conductivity Distribution across Central Europe

Červ, Václav; Kováčiková, Svetlana; Pek, Josef; Pěčová, Jana; Praus, O.

doi:10.5636/jgg.49.1585

Cited by 8 publications

(2 citation statements)

References 10 publications

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“…In magnetovariational (MV) studies, subsurface conductivity structures are investigated by means of this property of the induction arrows (e.g. Porath & Dziewonski 1971; Cerv et al 1997). It is easy to derive the linear relation between the transfer function and MT impedance given by Zhang et al (1993) using a linear approximation of the horizontal gradients in (28) and (29).…”

Section: Discussionmentioning

confidence: 99%

On galvanic distortion of regional 3-D MT impedances On galvanic distortion of regional three-dimensional magnetotelluric impedances

Utada

Munekane

2000

Geophysical Journal International

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S U M M A RYIn magnetotelluric (MT) studies, the observed response function (the MT impedance) usually su¡ers from galvanic distortions due to near-surface inhomogeneities. Removal of these e¡ects is essential to obtain an accurate model of the subsurface electrical conductivity structure. Galvanic distortion is usually expressed by a simple real tensor multiplying the undistorted regional impedance. The problem still remains of how to solve the ensuing linear equations in order to determine the distortion tensor and then to obtain the undistorted impedance. The methods presented and widely applied in previous works assume two-dimensionality for the undistorted impedance. This paper proposes a method that employs a relationship between the spatial derivatives of the horizontal electric ¢eld and the vertical geomagnetic component, which can be directly derived from Faraday's law. The identity derived from the relationship is written using the vertical magnetic transfer function, the impedance, and the spatial derivatives of the impedance and horizontal magnetic transfer functions. The present method determines the real distortion tensor so that the identity is satis¢ed. Therefore, the method has two major advantages: (1) galvanic distortion that is to be removed from the impedance tensor is clearly de¢ned, and (2) the method is applicable even when the regional structure is 3-D.

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Section: Discussionmentioning

confidence: 99%

On galvanic distortion of regional 3-D MT impedances On galvanic distortion of regional three-dimensional magnetotelluric impedances

Utada

Munekane

2000

Geophysical Journal International

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“…However, far‐going simplifications that the horizontal components are a normal field and tippers are equal to the vertical component H z were made. In the paper by Cerv et al (1997), one can find maps of the anomalous vertical component magnetic field of the Carpathian region obtained from the geomagnetic vectors.…”

Section: Introductionmentioning

confidence: 99%

Splines in the approximation of geomagnetic fields and their transforms at the Earth’s surface

Nowożyński

2012

Geophysical Journal International

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SUMMARY Infinite 2‐D splines of separated variables are a convenient tool to be used for approximation over a rectangle at the Earth’s surface of geomagnetic field components and transfer functions obtained from measurement data in unevenly distributed nodes. The spline approximation derived in this manner makes it possible to numerically calculate 2‐D Hilbert transforms and hence to reconstruct the magnetic tensor from tippers (induction vectors) by solving a large system of linear equations. The proposed method was tested on synthetic data and applied to the Carpathian region with the use of archival induction vectors collection.

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Magnetotelluric study of the eastern margin of the Bohemian Massif: relations between the Cadomian, Variscan, and Alpine orogeny

Klanica

Červ²,

Pek³

2018

Int J Earth Sci (Geol Rundsch)

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Model of Electrical Conductivity Distribution across Central Europe

Cited by 8 publications

References 10 publications

On galvanic distortion of regional 3-D MT impedances On galvanic distortion of regional three-dimensional magnetotelluric impedances

On galvanic distortion of regional 3-D MT impedances On galvanic distortion of regional three-dimensional magnetotelluric impedances

Splines in the approximation of geomagnetic fields and their transforms at the Earth’s surface

Magnetotelluric study of the eastern margin of the Bohemian Massif: relations between the Cadomian, Variscan, and Alpine orogeny

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