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CALCULATION OF MAGNETOTELLURIC FUNCTIONS AND THEIR VARIATIONS DUE TO CHANGES IN THE GROUNDWATER LEVEL
Abstract
Electromagnetic (EM) induction technique is one of the most important geophysical techniques in understanding the subsurface structure. The theory of magnetotelluric (MT) method, the main branch of the EM technique, was introduced during 50?s by Tickonov and Cagniard with the natural variation of electromagnetic fields, as its source. We will present the results of a study focused on the processing and modeling of magnetotelluric (MT) data in watered area located in the Moscow Region (Geophysical observatory "Mikhnevo" of Institute of Geosphere Dynamics of Russian Academy of Science). Issues related to the robust processing, and modeling of the data will be addressed. Moreover, we investigate relationship between seasonal changes in regime of groundwater level in conditions of the observatory "Mikhnevo" and variations of calculated magnetic tipper. We compare values of magnetic tipper, which is calculated on basis of numerical model of the magnetic tipper response associated with the change in the weight of the water-saturated layer, and magnetic tipper calculated from the components of the magnetic field on the Earth's surface.
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