E. A. Bataleva, V. Yu. Batalev, and A. K. Rybin
Research Station, Russian Academy of Sciences, Bishkek, Kyrgyzstan
Received May 21, 2012
Abstract—The behavior of the variations in the crustal electrical conductivity in a wide range of periods is
studied from the data of magnetotelluric soundings (MTS) during the Kambarata experiment (a strong indus-
trial explosion to construct the blast-fill dam on the Naryn river), as well as at Aksu, a stationary geophysical
monitoring point. The concept of the interrelation between the stress-strain state of the medium and the change
in the apparent electrical resistivity, which is based on the idea of the redistribution of mineralized solutions
between the crack networks, is confirmed experimentally. A procedure of azimuthal monitoring is developed,
which allowed us not only to identify the anomalous changes in the module and phase of apparent resistivity
but also to establish the directions of their maximum increases and decreases (the axes of compression and ten-
sion). For 34 points of deep MTS in the territory of Central Tien Shan, the depth intervals in the upper crust that
are most sensitive to the changes in the stress-strain state of the medium are established. The variations in the
electrical conductivity are compared with the solar-lunar tidal impacts. It is shown that by analyzing the
recorded time series, it is possible to recognize the characteristic signs of the changes in the stress-strain state
of the medium that are caused by seismic events.
Keywords: variations in electrical conductivity of the Earth, geophysical monitoring, magnetotelluric sound-
ings, earthquakes, industrial blasts
DOI: 10.1134/S1069351313030038
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