Deep crustal structure of the kamchatkan volcanic regions |
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| Authors: | S T Balesta A I Farberov V S Smirnov A A Tarakanovsky M I Zubin |
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| Institution: | 1. Institute of Volcanology, Academy of Sciences of USSR, Piip Avenue 9, Petropavlovsk-Kamchatsky, U.S.S.R.
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| Abstract: | Crustal structure in a number of Kamchatka volcanic regions is deduced from geophysical data. Anomalous structure and physical properties of the crust are found beneath some volcanic groups. Beneath the Klyuchevskaya and Avachinskaya volcanic groups crustal layers have high elastic properties. There is a thick transition layer from the crust to the upper mantle which has lower clastic properties and electrical resistance. These data, supported by experimental investigations of elastic properties of xenoliths in volcanic rocks at high pressures and temperatures, enable the probable substance composition of the crustal layers to be defined. The feeding zones and magma chambers of individual volcanoes are deduced from anomalies in gravity, electrical conductivity and seismic wave propagation. |
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