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Seismic processes and migration of magma during the Great Tolbachik Fissure Eruption of 1975–1976 and Tolbachik Fissure Eruption of 2012–2013, Kamchatka Peninsula

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Abstract

Seismic and volcanic processes in the area of the northern group of volcanoes (NGV) in Kamchatka Peninsula that accompanied the Great Tolbachik Fissure Eruption (GTFE) of 1975–1976 and the Tolbachik Fissure Eruption (TFE, or “50 let IViS” due to anniversary of the Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences) of 2012–2013 and the seismic activity between these events are considered. The features of evolution of seismic processes of the major NGV volcanoes (Ploskii Tolbachik, Klyuchevskoy, Bezymannyi, and Shiveluch) are revealed. The distribution of earthquakes along depth, their spatial and temporal migration, and the relation of seismic and volcanic activity are discussed. The major features of seismic activity during the GTFE preparation and evolution and a development of earthquake series preceding the origin of the northern and southern breaks are described. The character of seismic activity between the GTFE and TFE is shown. The major peculiarities of evolution of seismic activity preceding and accompanying the TFE are described. The major magma sources and conduits of the NGV volcanoes are identified, as is the existence of a main conduit in the mantle and a common intermediate source for the entire NGV, the depth of which is 25–35 km according to seismic data. The depth of a neutral buoyancy layer below the NGV is 15–20 km and the source of areal volcanism of magnesian basalts northeast of the Klyuchevskoy volcano is located at depth of ~20 km. These data support the major properties of a 2010 geophysical model of magmatic feeding system of the Klyuchevskoy group of volcanoes. The present paper covers a wider NGV area and is based on the real experimental observations.

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10/1, Moscow, 123242, Russia

    S. A. Fedotov, L. B. Slavina & M. S. Kuchay

  2. Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, bl. Piipa 9, Petropavlovsk-Kamchatskii, 683006, Russia

    S. A. Fedotov

  3. Kamchatka Branch, Geophysical Survey, Russian Academy of Sciences, bl. Piipa 9, Petropavlovsk-Kamchatskii, 683006, Russia

    S. L. Senyukov

Authors
  1. S. A. Fedotov
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  2. L. B. Slavina
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  3. S. L. Senyukov
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  4. M. S. Kuchay
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Correspondence to S. A. Fedotov.

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Original Russian Text © S.A. Fedotov, L.B. Slavina, S.L. Senyukov, M.S. Kuchay, 2014, published in Geofizicheskie Protsessy i Biosfera, 2014, Vol. 13, No. 3, pp. 5–30.

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Fedotov, S.A., Slavina, L.B., Senyukov, S.L. et al. Seismic processes and migration of magma during the Great Tolbachik Fissure Eruption of 1975–1976 and Tolbachik Fissure Eruption of 2012–2013, Kamchatka Peninsula. Izv. Atmos. Ocean. Phys. 51, 667–687 (2015). https://doi.org/10.1134/S000143381507004X

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