TY - JOUR

T1 - Anatomy of the Bezymianny volcano merely before an explosive eruption on 20.12.2017

AU - Koulakov, Ivan

AU - Plechov, Pavel

AU - Mania, René

AU - Walter, Thomas R.

AU - Smirnov, Sergey Z.

AU - Abkadyrov, Ilyas

AU - Jakovlev, Andrey

AU - Davydova, Vesta

AU - Senyukov, Sergey

AU - Bushenkova, Natalia

AU - Novgorodova, Angelika

AU - Stupina, Tatyana

AU - Droznina, Svetlana Ya

N1 - Funding Information: This study is supported by the Russian Science Foundation Grant #20-17-00075 and Russian Foundation for Basic Research Grant #19-05-00101. We are grateful to Marina and Alexander Belousov for help in organizing the field trip on Bezymianny. Publisher Copyright: © 2021, The Author(s). Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/1/19

Y1 - 2021/1/19

N2 - Strong explosive eruptions of volcanoes throw out mixtures of gases and ash from high-pressure underground reservoirs. Investigating these subsurface reservoirs may help to forecast and characterize an eruption. In this study, we compare seismic tomography results with remote sensing and petrology data to identify deep and subaerial manifestations of pre-eruptive processes at Bezymianny volcano in Kamchatka shortly before its violent explosion on December 20, 2017. Based on camera networks we identify precursory rockfalls, and based on satellite radar data we find pre-eruptive summit inflation. Our seismic network recorded the P and S wave data from over 500 local earthquakes used to invert for a 3D seismic velocity distribution beneath Bezymianny illuminating its eruptive state days before the eruption. The derived tomography model, in conjunction with the presence of the high-temperature-stable SiO2 polymorph Tridymite in juvenile rock samples , allowed us to infer the coexistence of magma and gas reservoirs revealed as anomalies of low (1.5) and high (2.0) Vp/Vs ratios, respectively, located at depths of 2–3 km and only 2 km apart. The reservoirs both control the current eruptive activity: while the magma reservoir is responsible for episodic dome growth and lava flow emplacements, the spatially separated gas reservoir may control short but powerful explosive eruptions of Bezymianny.

AB - Strong explosive eruptions of volcanoes throw out mixtures of gases and ash from high-pressure underground reservoirs. Investigating these subsurface reservoirs may help to forecast and characterize an eruption. In this study, we compare seismic tomography results with remote sensing and petrology data to identify deep and subaerial manifestations of pre-eruptive processes at Bezymianny volcano in Kamchatka shortly before its violent explosion on December 20, 2017. Based on camera networks we identify precursory rockfalls, and based on satellite radar data we find pre-eruptive summit inflation. Our seismic network recorded the P and S wave data from over 500 local earthquakes used to invert for a 3D seismic velocity distribution beneath Bezymianny illuminating its eruptive state days before the eruption. The derived tomography model, in conjunction with the presence of the high-temperature-stable SiO2 polymorph Tridymite in juvenile rock samples , allowed us to infer the coexistence of magma and gas reservoirs revealed as anomalies of low (1.5) and high (2.0) Vp/Vs ratios, respectively, located at depths of 2–3 km and only 2 km apart. The reservoirs both control the current eruptive activity: while the magma reservoir is responsible for episodic dome growth and lava flow emplacements, the spatially separated gas reservoir may control short but powerful explosive eruptions of Bezymianny.

UR - http://www.scopus.com/inward/record.url?scp=85099565834&partnerID=8YFLogxK

U2 - 10.1038/s41598-021-81498-9

DO - 10.1038/s41598-021-81498-9

M3 - Article

C2 - 33469148

AN - SCOPUS:85099565834

VL - 11

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 1

M1 - 1758

ER -