On heterogeneities with reduced viscosity in the mantle under the Kamchatka volcanoes according to seismological data |
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| Authors: | A I Farberov V I Gorelchik S I Zubkov |
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| Institution: | 1. Institute of Volcanology, Petropavlovsk-Kamchatskiy
2. Moscow Institute of Physics of the Earth, USSR Academy of Sciences, USSR
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| Abstract: | A seismological study of the upper mantle under the Kamchatka volcanoes using body waves from nearby earthquakes has shown local heterogencities consisting of materials with reduced elastic properties at depths from 30 to 90 km. The estimated value of the upper limit of viscosity,η, is about 6 × 1020 pois for the material of the mantle aseismic zone under the Kamchatka volcanoes at depths of ～ 70–150 km. It is suggested that the magmatic chambers are rooted in the mantle heterogeneities filled with substance of reduced elasticity and viscosity. |
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