On the eruptions, deformation, and seismicity of Klyuchevskoy Volcano, Kamchatka in 1986–2005 and the mechanisms of its activity |
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| Authors: | S A Fedotov N A Zharinov |
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| Institution: | (1) Institute of Volcanology and Seismology, Far East Division, Russian Academy of Sciences, Petropavlovsk-Kamchatskii, 683006, Russia |
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| Abstract: | The eruptions, seismicity, and deformations, the properties of the magma feeding, and the mechanism of the activity of Klyuchevskoy, a giant basaltic volcano in Kamchatka, are considered. Twenty-eight author’s papers on the above subjects, published from 1985 to 2006, are reviewed. The activity of Klyuchevskoy the adventive and summit eruptions of Klyuchevskoy from 1986 to 2005 is described. The seismicity of Klyuchevskoy from 1986 to 2005 and its relation to eruptions are considered. It was inferred from geodetic measurements that the center of the magmatic pressure beneath the volcano moved in the depth range from 3 to 25 km during the period from 1979 to 2005. Based on previously developed models and observations from 1986 to 2005, the main properties of the Klyuchevskoy magma feeding system and the magma ascent in five major parts of the system are described and characterized: near the top of the plunging Pacific plate (with a depth of approximately 160 km), in the asthenosphere (160 to 40 km), in the region of the intermediate magma chamber where the magmas coming from below are accumulated (40 to 20 km), in the crust (20 to 5 km), and in the upper part of the system (from a depth of 5 km under the volcanic edifice to the crater at an altitude of 4.75 km). A comparison between the outputs from the summit and adventive eruptions on Klyuchevskoy as functions of time for the period from 1978 to 2005 shows that the probability of adventive eruptions should increase in the future. |
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