Results 21 to 30 of about 2,756 (207)

The pre-Cainozoic basement delineation by magnetotelluric methods in the western part of the Liptovská kotlina Depression (Western Carpathians, Slovakia)

open access: yesGeologica Carpathica, 2017
The geology and hydrogeology of the Liptovská Kotlina Depression were studied by means of new geophysical methods. Controlled source audio-frequency magnetotellurics enabled us to delineate the relief of the pre-Cainozoic basement in the western part of ...
Fendek Marián   +5 more
doaj   +1 more source

Estimating the Geoelectric Field and Electric Power Transmission Line Voltage During a Geomagnetic Storm in Alberta, Canada Using Measured Magnetotelluric Impedance Data: The Influence of Three‐Dimensional Electrical Structures in the Lithosphere

open access: yesSpace Weather, 2021
Estimating the effect of geomagnetic disturbances on power grid infrastructure is an important problem since they can induce damaging currents in electric power transmission lines. In this study, an array of magnetotelluric (MT) impedance measurements in
Darcy Cordell   +5 more
doaj   +1 more source

A note on the topographic distortion of magnetotelluric impedance

open access: yesAnnals of Geophysics, 2002
Magnetotelluric surveys are prone to interpretation errors in the presence of rough topography, which may need to be compensated for. In the present work we assume that the surface of the Earth is simulated by a single-valued, twice differentiable ...
F. Vallianatos
doaj   +1 more source

The Relationship Between Kimberlitic Magmatism and Electrical Conductivity Anomalies in the Mantle

open access: yesGeophysical Research Letters, 2022
Kimberlites are igneous rocks whose formation remains enigmatic due to their severely altered nature, highly variable compositions and rapid ascent through the lithosphere.
Sinan Özaydın, Kate Selway
doaj   +1 more source

Detecting a salt dome overhang with magnetotellurics: 3D inversion methodology and synthetic model studies [PDF]

open access: yes, 2012
Detecting a salt dome overhang is known to be problematic by seismic methods alone. We used magnetotellurics (MT) as a complementary method to seismics to investigate the detectability of a salt dome overhang.
Anna Avdeeva   +3 more
core   +1 more source

Effect of Displacement Current on the Finite-Difference Modeling of Natural Source Electromagnetic Diffusion

open access: yesApplied Sciences, 2020
For electromagnetic (EM) modeling based on the electric-field formulation at low frequencies, the quasi-static approximation (i.e., only the conduction current is considered and the displacement current is ignored) is commonly applied, and a small ...
Yahui Xue   +5 more
doaj   +1 more source

Imaging the Whole‐Lithosphere Architecture of a Mineral System—Geophysical Signatures of the Sources and Pathways of Ore‐Forming Fluids

open access: yesGeochemistry, Geophysics, Geosystems, 2022
Mineral systems can be thought of as a combination of several critical elements, including the whole‐lithosphere architecture, favorable geodynamic/tectonic events, and fertility.
Matthew J. Comeau   +2 more
doaj   +1 more source

Combined Application of Wide-Field Electromagnetic Method and Flow Field Fitting Method for High-Resolution Exploration: A Case Study of the Anjialing No. 1 Coal Mine

open access: yesEngineering, 2018
The Anjialing No. 1 Coal Mine in Shanxi Province, China, contains a complicated old goaf and an unknown water distribution that hold high potential for serious water hazards.
Jishan He
doaj   +1 more source

Application of Controlled Source Audio Magnetotelluric (Csamt) at Geothermal [PDF]

open access: yes, 2017
CSAMT or Controlled Source Audio-Magnetotelluric is one of the Geophysics methods to determine the resistivity of rock under earth surface. CSAMT method utilizes artificial stream and injected into the ground, the frequency of artificial sources ranging ...
Mustopa, E. J. (Enjang)   +1 more
core   +2 more sources

A new petrological and geophysical investigation of the present-day plumbing system of Mount Vesuvius [PDF]

open access: yes, 2010
Article in PressInternational audienceA model of the electrical resistivity of Mt. Vesuvius has been elaborated to investigate the present structure of the volcanic edifice. The model is based on electrical conductivity measurements in the laboratory, on
Gaillard, Fabrice   +5 more
core   +3 more sources

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