TY - JOUR

T1 - Three different types of plumbing system beneath the neighboring active volcanoes of Tolbachik, Bezymianny, and Klyuchevskoy in Kamchatka

AU - Koulakov, Ivan

AU - Abkadyrov, Ilyas

AU - Al Arifi, Nassir

AU - Deev, Evgeny

AU - Droznina, Svetlana

AU - Gordeev, Evgeny I.

AU - Jakovlev, Andrey

AU - El Khrepy, Sami

AU - Kulakov, Roman I.

AU - Kugaenko, Yulia

AU - Novgorodova, Anzhelika

AU - Senyukov, Sergey

AU - Shapiro, Nikolay

AU - Stupina, Tatyana

AU - West, Michael

PY - 2017/5/1

Y1 - 2017/5/1

N2 - 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.

AB - 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.

KW - Bezymianny

KW - Klyuchevskoy volcano group

KW - magma plumbing system

KW - seismic tomography

KW - Tolbachik

KW - SUBDUCTION ZONES

KW - MANTLE WEDGE

KW - ALGORITHM

KW - PENINSULA

KW - SLABS

KW - DYNAMICS

KW - MAGMA

KW - LITHOSPHERE

KW - SEISMIC TOMOGRAPHY

KW - VELOCITIES

UR - http://www.scopus.com/inward/record.url?scp=85019958697&partnerID=8YFLogxK

U2 - 10.1002/2017JB014082

DO - 10.1002/2017JB014082

M3 - Article

AN - SCOPUS:85019958697

VL - 122

SP - 3852

EP - 3874

JO - Journal of Geophysical Research: Solid Earth

JF - Journal of Geophysical Research: Solid Earth

SN - 2169-9313

IS - 5

ER -