TEMPORARY VARIATIONS OF MAGNETOTELLURIC FUNCTION (MAGNETIC TIPPER) AND THEIR POSSIBLE RELATIONSHIP WITH VARIATIONS OF GROUNDWATER LEVEL

Abstract

The magnetotelluric method is used to solve a wide
range of problems related to the partition of geological sections with electromagnetic properties varying in depth and from point to point. In particular, magnetovariational sounding is widely used based on the spatiotemporal analysis of variations in the magnetic components of the magnetotelluric field. The purpose of this paper is to analyze synchronous variations of the magnetic tipper and the groundwater level of the pressure-free horizon recorded in a heavily flooded area. As the initial data,
we use the results of monitoring variations in the geomagnetic field and hydrogeological regime, performed at the Mikhnevo Geophysical Observatory of Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Sciences (54.96º N, 37.76º E). When performing these studies, modern methods of correlation and regression analysis are used. The magnetic tipper is evaluated based on the signal-to-noise separation method. The data obtained in the work indicate a negative and close to
linear relationship between the amplitude of the
magnetic tipper and the groundwater level of the
pressure-free horizon.