Abstract
This chapter is dedicated to electromagnetic monitoring by magnetovariation methods and reveals a possible connection of geoelectric characteristics with solar activity, seismicity and a very interesting phenomenon of geomagnetic jerk. It highlights the peculiarities of the data processing with examples; the technique to obtain stable and reliable results is shown. A method is presented for experimental detection of the direction to the geomagnetic pole that can be used for geomagnetic deep soundings. The presented successful approach to electromagnetic monitoring has allowed establishing a strong correlation with the solar activity and quasi-linear trend in the apparent resistivity that may indicate the changes of mantle conductivity. It is shown that there are several zones in Eurasia where the variations of apparent resistivity are related to integral seismicity with magnitude greater than 3. Some features in the induction vectors and apparent resistivity have been detected which coincide in time with geomagnetic jerks registered on the European geomagnetic network. A possible mechanism of geomagnetic jerk’s influence on the induction sounding results is presented.
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Semenov, V., Petrishchev, M. (2018). Electromagnetic Monitoring. In: Induction Soundings of the Earth's Mantle. GeoPlanet: Earth and Planetary Sciences. Springer, Cham. https://doi.org/10.1007/978-3-319-53795-5_5
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