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oa Features of Magnetotelluric Transfer Functions for the Central Part of East European Platform
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Geomodel 2017, Sep 2017, Volume 2017, p.1 - 6
Abstract
Magnetotelluric transfer functions are in demand not only in researching of the Earth’s crust geoelectric structure, including in the allocation of the increased fracturing zone, and are also involved in monitoring seismotectonic processes in the lithosphere, establishing effects accompanying earthquakes and searching for possible ore occurrences and oil-gas-saturated deposits. In this work we present an analysis of magnetotelluric transfer functions for the mid-latitude conditions of the East European Platform. The analysis was carried out with the use of instrumental observations made at Geophysical observatory Mikhnevo and Geophysical observatory Borok from 2010 to 2013. The robust method of signal-to-noise separation was used as an evaluation of magnetotelluric transfer functions, which makes it possible to suppress noise of various types. As a result of the analysis of data from observatories Mikhnevo and Borok, the annual periodicity of the variations of the magnetic tipper and the magnetic tensor is established. In the magnetic tensor, annual variations are more pronounced in the variations of the phases of the main components, and in the magnetic tipper variations, along with the annual periodicity, there also are variations with a sixmonth periodicity and with a period of 60 days.