Three different types of plumbing system beneath the neighboring active volcanoes of Tolbachik, Bezymianny, and Klyuchevskoy in Kamchatka

Ivan Koulakov, Ilyas Abkadyrov, Nassir Al Arifi, Evgeny Deev, Svetlana Droznina, Evgeny I. Gordeev, Andrey Jakovlev, Sami El Khrepy, Roman I. Kulakov, Yulia Kugaenko, Anzhelika Novgorodova, Sergey Senyukov, Nikolay Shapiro, Tatyana Stupina, Michael West

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The Klyuchevskoy group of volcanoes (KGV) in Kamchatka includes three presently active volcanoes (Klyuchevskoy, Bezymianny, and Tolbachik) located close together in an area of approximately 50 × 80 km. These three volcanoes have completely different compositions and eruption styles from each other. We have analyzed new data recorded by a temporary seismic network consisting of 22 seismic stations operated within the area of Tolbachik in 2014–2015 in conjunction with the data from the permanent network and the temporary PIRE network deployed at the Bezymianny volcano in 2009. The arrival times of the P and S waves were inverted using a local earthquake tomography algorithm to derive 3-D seismic models of the crust beneath the KGV as well as accurate seismicity locations. High-resolution structures beneath the Tolbachik volcanic complex were identified for the first time in this study. The tomography results reveal three different types of feeding system for the main KGV volcanoes. The basaltic lavas of the Klyuchevskoy volcano are supplied directly from a reservoir at a depth of 25–30 km through a nearly vertical pipe-shaped conduit. The explosive Bezymianny volcano is fed through a dispersed system of crustal reservoirs where a lighter felsic material separates from the mafic component and ascends to the upper crust to form andesitic magma sources. For Tolbachik, low-viscosity volatile-saturated basalts ascend from two deep reservoirs following a system of fractures in the crust associated with the intersections of regional faults.

Original languageEnglish
Pages (from-to)3852-3874
Number of pages23
JournalJournal of Geophysical Research: Solid Earth
Volume122
Issue number5
DOIs
Publication statusPublished - 1 May 2017

Keywords

  • Bezymianny
  • Klyuchevskoy volcano group
  • magma plumbing system
  • seismic tomography
  • Tolbachik
  • SUBDUCTION ZONES
  • MANTLE WEDGE
  • ALGORITHM
  • PENINSULA
  • SLABS
  • DYNAMICS
  • MAGMA
  • LITHOSPHERE
  • SEISMIC TOMOGRAPHY
  • VELOCITIES

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