S.S. Starzhinskii1,, S.Yu. Khomutov2,
RESULTS OF TRIAL MAGNITOVARIATIONAL SOUNDING IN THE KAMCHATKA VOLCANIC REGION
1V.I. Il’ichev Pacific Octanological Institute Far Eastern Branch Russian Academy of Science, Vladivosrtok, Russia
2Institute of cosmophysical research and radio wave propagation FEB RAS, Paratunka, Russia
Keywords: magnetovariational sounding, tipper, ModEM, 3D inversion, geoelectrical section
Abstract
The results of performance the magnetovariational sounding in geologically complex Eastern Kamchatka volcanic belt with the active at present time volcanoes are presented. In investigation the geomagnetic variations received at “Paratunka” observatory and its station “Karymshina”, which is about 18 km apart to southwest from it. Calculated at both site tippers were undergone to 3D inversion by means of ModEM program. During inversion the different start models as homogeneous half-space and the same including the water layer of the nearest Pacific Ocean, taken into account its bathymetry, were used. The carried out inversion let to define the conductive blocks in geoelectrical section at depth range about 10-50 km under volcanic belt. In order to test this result, the 3D inversion of tippers taken by means of solving the direct magnetotelluric task for model containing conductive blocks in the same depth range was performed. In the article the most characteristic horizontal slices and vertical sections of received evaluative geoelectrical model of study area, including Paratunka geothermal area and caldera Karymshina, are presented. The results obtained are compared with the results of a seismic tomography at S-waves, which were get in this region.
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