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A deep geoelectric model of the Petropavlovsk geodynamic research area, Kamchatka



A deep geoelectric model of the Petropavlovsk geodynamic research area, Kamchatka



Izvestiya - Russian Academy of Sciences Physics of the Solid Earth



The method and results of the interpretation of magnetotelluric sounding (MTS) data are considered. Based on physical and numerical modeling, longitudinal MTS curves directed along the Kamchatka Peninsula are accepted for further interpretation. They are less affected by the coast effect. The method of statistical averaging was used to suppress local galvanic effects. Two areas differing in deep electrical conductivity are revealed from the interpretation of MTS curves: the southwestern area with a well-developed crustal layer of higher conductivity and the northeastern area adjoining the seismic focal zone and giving no evidence of this layer. The boundary between these areas in the upper crust is represented by a graben filled with conducting rocks as thick as 6 km. Active volcanoes are confined to the northeastern flank of the graben. The crustal conducting layer rises from a depth of 25 km in the southwest up to a depth of 10 km under the active volcanoes. The electric conductivity model is compared with heat flow, gravity, and seismological data. The origin of the crustal conductor is associated with the presence of hydrothermal solutions and melts. The possible geodynamic processes in the area of recent volcanism are discussed. Proposals are presented concerning the development of an electromagnetic field monitoring network for the prediction of strong earthquakes and volcanic eruptions.

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