scholarly journals Electromagnetic induction in the earth by an aperiodic non-uniform current source.

1974 ◽  
Vol 26 (1) ◽  
pp. 39-53 ◽  
Author(s):  
R. D. HIBBS ◽  
F. W. JONES
Keyword(s):  
Electromagnetic Induction ◽  
Current Source ◽  
The Earth ◽  
Uniform Current

scholarly journals Study of Geo-Electric Data Collected by the Joint EMSEV-Bishkek RS-RAS Cooperation: Possible Earthquake Precursors

Entropy ◽  
2018 ◽  
Vol 20 (8) ◽  
pp. 614
Author(s):  
Konstantina Papadopoulou ◽  
Efthimios Skordas ◽  
Jacques Zlotnicki ◽  
Toshiyasu Nagao ◽  
Anatoly Rybin
Keyword(s):  
Epicentral Distance ◽  
Current Source ◽  
Earthquake Precursors ◽  
The Other ◽  
Electric Signal ◽  
Seismic Events ◽  
The Earth ◽  
Subsurface Resistivity ◽  
Telluric Currents ◽  
Electric Current Source

By employing the cross-correlogram method, in geo-electric data from the area of Kyrgyzstan for the period 30 June 2014–10 June 2015, we identified Anomalous Telluric Currents (ATC). From a total of 32 ATC after taking into consideration the electric current source properties, we found that three of them are possible Seismic Electric Signal (SES) activities. These three SES activities are likely to be linked with three local seismic events. Finally, by studying the corresponding recordings when a DC alternating source injects current into the Earth, we found that the subsurface resistivity seems to be reduced before one of these three earthquakes, but a similar analysis for the other two cannot be done due to their large epicentral distance and the lack of data.

HIGH‐FREQUENCY ELECTROMAGNETIC COUPLING BETWEEN SMALL COPLANAR LOOPS OVER AN INHOMOGENEOUS GROUND

Geophysics ◽  
1972 ◽  
Vol 37 (6) ◽  
pp. 997-1004 ◽  
Author(s):  
James A. Fuller ◽  
James R. Wait
Keyword(s):  
Half Space ◽  
High Frequency ◽  
Electromagnetic Coupling ◽  
Current Source ◽  
Vertical Axis ◽  
Loop Current ◽  
Mutual Impedance ◽  
Multiplicative Factor ◽  
The Earth ◽  
Horizontal Electric Dipole

An integral formulation is given for the fields of a loop current source which is located over a horizontally stratified half‐space and has a vertical axis. The electrical properties of the half‐space vary exponentially with the depth into the earth. An asymptotic solution is developed for the case of source and observer on the interface but separated by a large numerical distance. The approximate solution is then used to determine the mutual impedance between two small loops and between the loop and a horizontal electric dipole, when the antennas are on the interface. It is found that the effect of stratification on the mutual impedance is represented approximately by a single multiplicative factor.

scholarly journals Special issue “Studies on electromagnetic induction in the earth: recent advances”

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
Weerachai Siripunvaraporn ◽  
Paul A. Bedrosian ◽  
Yuguo Li ◽  
Prasanta K. Patro ◽  
Klaus Spitzer ◽  
...  
Keyword(s):  
Electromagnetic Induction ◽  
Special Issue ◽  
The Earth ◽  
Recent Advances
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