Inductive and orientational effects of geomagnetic variations in the southwest of the Zarechenskaya magnetic anomaly (eastern coast of lake Baikal)

Abstract

Tectonomagnetic monitoring is most often carried out in areas where bodies with anomalous values of magnetic properties (magnetic susceptibility and remanent magnetization) are located, since they are indicators of changes in the stress state of the Earth's crust. However, when performing modular measurements, secondary effects of geomagnetic variations arise, the amplitude of which exceeds the expected magnetoelastic effect. A method was proposed for determining the coefficients of the linear dependence of the magnitude of the secondary effects of geomagnetic variations on the components of these variations. The singular value decomposition method was applied to identify the optimal periods of variations for calculating the coefficients. After excluding secondary effects from the results of observations at the stations Zarechye-1 and Sukhaya-2, it was possible to reduce the root-mean-square deviation of the difference values of the modulus of the magnetic induction vector between these points and the Enkhaluk base station by 4 times.