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Mantle and crustal sources of magmatic activity of Klyuchevskoy and surrounding volcanoes in Kamchatka inferred from earthquake tomography
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  • Koulakov Ivan,
  • Nikolai M. Shapiro,
  • Christoph Sens-Schönfelder,
  • Birger Gottfried Luehr,
  • Evgeny Gordeev,
  • Jakovlev Andrey,
  • Ilyas Abkadyrov,
  • Danila V. Chebrov,
  • Svetlana Ya. Droznina,
  • Sergey L. Senyukov,
  • Novgorodova Anzhelika,
  • Tatyana Stupina
Koulakov Ivan
Trofimuk Institute of Petroleum Geology and Geophysics, SB RAS

Corresponding Author:[email protected]

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Nikolai M. Shapiro
Institut Physique du Globe de Paris
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Christoph Sens-Schönfelder
GeoForschungsZentrum Potsdam
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Birger Gottfried Luehr
GeoForschungsZentrum Potsdam
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Evgeny Gordeev
Institute of Volcanology and Seismology
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Jakovlev Andrey
Trofimuk Institute of Petroleum Geology and Geophysics, SB RAS
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Ilyas Abkadyrov
Institute of Volcanology and Seismology (RAS)
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Danila V. Chebrov
Kamchatka Division of Geophysical Survey RAS
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Svetlana Ya. Droznina
Kamchatka Branch of the Geophysical Survey, Russian Academy of Sciences
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Sergey L. Senyukov
Kamchatka Branch of the Geophysical Survey, Russian Academy of Sciences
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Novgorodova Anzhelika
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS
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Tatyana Stupina
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS
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Abstract

Klyuchevskoy and surrounding volcanoes in central Kamchatka form the Northern Group of Volcanoes (NGV), which is an area of the particularly diverse and intensive Pleistocene-Holocene volcanism. In this study, we present a new seismic tomographic model of the crust and uppermost mantle beneath NGV based on local earthquake data recorded by several permanent and temporary seismic networks including a large-scale KISS experiment that was conducted in 2015-2016 by an international scientific consortium. The new model has for Kamchatka an unprecedented resolution and reveals many features associated with the present and past volcanic activity within the NGV. In the upper crust, we found several prominent high-velocity anomalies interpreted as traces of large basaltic shield volcanoes, which were hidden by more recent volcanic structures and sediments. For the mantle structures, we found that the entire system of NGV was fed by an asthenospheric flow arriving through a slab window located below the Kamchatka-Aleutian junction. The interaction of the hot asthenospheric material with fluids released from the slab determines the particular volcanic activity within the NVG. We argue that the eastern branch of the Central Kamchatka Depression, which is associated with a prominent low-velocity anomaly in the uppermost mantle, was formed as a recent rift zone separating the NGV from the Kamchatka Eastern Ranges.
Oct 2020Published in Journal of Geophysical Research: Solid Earth volume 125 issue 10. 10.1029/2020JB020097