Results 181 to 190 of about 5,330 (213)

Quantitative Geoelectric Mapping Of The Hydraulic Conductivity Field

14th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2001
This paper describes in a stochastic framework how geoelectrics can be used to quantitatively map the hydraulic conductivity field. This is achieved by describing both a microscale and a macroscale model of aquifer electrical and hydraulic flow. The microscale model reveals that electrical and hydraulic conductivities are a function of two common ...
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Polar Cap May Have A Geoelectric Field

Physics Today, 1969
During the period of high solar and geomagnetic activity in late May 1967 the Air Force satellite OV1-9 detected energetic proton fluxes coming up the magnetic field lines from the earth at high magnetic latitudes (λ⩾65–70 deg). Ludwig Katz and Paul L.
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Estimation of geoelectric field for validating geomagnetic disturbance modeling

2013 IEEE Power and Energy Conference at Illinois (PECI), 2013
Geomagnetic induced currents (GICs) cause half cycle saturation of transformers and consequently increase the harmonic currents and reactive power in the grid. This paper focuses on the GIC modeling as an important geomagnetic disturbance (GMD) mitigation program.
M. Kazerooni, null Hao Zhu, K. Shetye, T. J. Overbye   +3 more
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Tidal wave anomalies of geoelectrical field before remote earthquakes

Acta Seismologica Sinica, 2007
In this paper, geoelectrical field anomalies at Changli and Xingji station in Hebei Province were analyzed before five remote earthquakes. It was found that the anomalies mainly occurred two or three months before earthquakes, which is of importance to short-term and impendent earthquake prediction.
Xue-min Zhang, Yan-zhong Zhai, Xue-zeng Guo, Jian-fang Guo   +3 more
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Geoelectrical fields in a layered earth with arbitrary anisotropy

GEOPHYSICS, 1999
In many cases in geoelectrical exploration, the standard model of a layered isotropic half‐space is a good approximation to geophysical reality. But sometimes it is useful to extend this model to uniform anisotropic layers. For example, in regions with distinct dipping stratification, one will try to represent this conductivity variation in the form of
Changchun Yin, Peter Weidelt
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Experimental Geoelectric Investigation within the Gold Field in Ukraine

2nd EAGE St Petersburg International Conference and Exhibition on Geosciences, 2006
The results of experimental geoelectric investigation within the gold field in Ukraine are given. The obtained data show that developed express-technology of geoelectric research can be used for ore (and gold) fields prospecting.
M. Yakymchuk, I. Korchagin, S. Levashov, Y. Pyschaniy, A. Koval   +4 more
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Numerical analysis of geoelectric fields in a medium with faults

Computational Mathematics and Modeling, 1999
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Barashkov, A. S., Dmitriev, V. I.
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Geoelectric Field Response to Seepage in Sand and Clay Formations

Journal of Hydrologic Engineering, 2019
AbstractAn understanding of groundwater flow in soil and rocks is necessary for civil and environmental engineering. Real-time monitoring of groundwater flow is a relatively new research area.
Yong Liu, Chao Lü, Qiang Sun
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Change of a geoelectrical section under effect of elastic fields

Proceedings, 1996
In the last years Russian scientists from Low-Volga institute of geology and geophysics (Saratov) made some experiments to study an influence of vibrating effect on electromagnetic soundings results. These works were perfumed to investigate a possibility to raise on this basis the geological efficiency of oil and gas deposits prospecting. On fig .1 the
B. S. Svetov, E. L. Ozerkov, V. V. Tikshaev, O. A. Ageeva   +3 more
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Mathematical modelling of some geoelectrical fields in archaeological exploration

4th EEGS Meeting, 1998
The geoelectrical fields observed on rugged topography (necropolis) are considerably complicated by the effect of unevenness of the earth's surface. This effect can be eliminated in geophysical interpretation. For solving the inverse problem of geoelectrical investigation in archaeological exploration it is necessary to determine the subsurface ...
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