Results 171 to 180 of about 4,199 (222)
Geoelectric hazard maps for the continental United States
Geophysical Research Letters, 2016 In support of a multiagency project for assessing induction hazards, we present maps of extreme-value geoelectric amplitudes over about half of the continental United States.
Jeffrey J Love +2 more
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Optimizing Geoelectrical Arrays for Special Geoelectrical Monitoring Instruments
Proceedings, 2016In this work we adopted an array optimization scheme for a special geoelectrical monitoring instrument for which no standard geoelectrical arrays exists. Optimized measurements are selected on the basis of their Jacobian matrix values. Application is demonstrated though model and real examples from a landslide site in Austria. Synthetic and real tests
P. Tsourlos +4 more
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Geoelectric modeling with Kernel methods
2007 International Joint Conference on Neural Networks, 2007Electrical resistivity variations measured along vertical boreholes are usually very rough, with amplitudes of the shortest wavelengths being about equal to those of the longest ones. On the other hand, surface resistivity measurements are usually interpreted in terms of models that contain only long wavelengths. The usual approach consists of applying
Hugo Hidalgo 0001 +1 more
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Space Weather, 2017 Geoelectric fields at the Earth's surface caused by magnetic storms constitute a hazard to the operation of electric power grids and related infrastructure.
Anna Kelbert +2 more
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The Geoelectrical Structure of Northwestern Anatolia, Turkey
Pure and Applied Geophysics, 2007The magnetotelluric method has been employed to generate a geoelectrical model that will reveal the rich geological pattern and dynamic character of western and northwestern Anatolia, Turkey. Magnetotelluric data were collected from 53 sites along a profile of 290 km from the Dardanelles to the Alasehir Graben. Magnetotelluric data were in the range of
Ulugergerli, E. U. +5 more
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Geoelectric Effect and Geotropic Curvature
Science, 1965A transverse electrical potential develops in many plant organs after they are reoriented from a vertical to a horizontal position. This phenomenon has been the basis for both a geoelectric hypothesis of geotropic curvature and its subsequent refutation. In both arguments a causal relation between the potential and curvature has been assumed. Curvature
R R, Dedolph, J J, Breen, S A, Gordon
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Izvestiya, Physics of the Solid Earth, 2016
The problem of energy paradoxes revealed in geoelectrics are discussed. The experimental facts illustrating the anomalous energy characteristics of the magnetotelluric (MT) field are presented. An attempt is made to interpret these anomalies from the standpoint of directional analysis. Two three-layer models corresponding to the situation |Q| > 1 and \(
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The problem of energy paradoxes revealed in geoelectrics are discussed. The experimental facts illustrating the anomalous energy characteristics of the magnetotelluric (MT) field are presented. An attempt is made to interpret these anomalies from the standpoint of directional analysis. Two three-layer models corresponding to the situation |Q| > 1 and \(
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Geoelectrical anomaly patterns of reservoir and geoelectrical methods for direct reservoir detection
SEG Technical Program Expanded Abstracts 2007, 2007Summary The paper presents some geo-electrical methods for reservoir boundary mapping including spectral induced polarization (SIP), time-frequency electromagnetic (TFEM) and borehole surface EM. These methods are newly improved in China. They show powerful exploration ability and certain resolution on the detection of oil reservoir and the prediction ...
Zhanxiang He, Haiying Liu, Biyan Tang
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Geomagnetic and geoelectric variations
Journal of Atmospheric and Terrestrial Physics, 1955Abstract The geomagnetic variations and their relation to earth-currents have been investigated, especially the pulsations with periods of 10 to 102 seconds. A worldwide survey of a few examples of pulsations (selected from the IATME Bulletins and the quarterly De Bilt reports) indicates that the source of the phenomenon may be the ionospheric ...
J.G. Scholte, Veldkamp J.
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On the geoelectrics of inhomogeneous media
Izvestiya, Physics of the Solid Earth, 2015This work, largely methodological, is devoted to the analysis of the key equation of geoelectrics. In the one-dimensional (1D) case, when the electric conductivity only depends on a single Cartesian coordinate, the equation of geoelectrics is reduced to the form of the Helmholtz equation.
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