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Journal Article

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

Authors

Koulakov,  Ivan
External Organizations;

Plechov,  Pavel
External Organizations;

/persons/resource/mania

Mania,  R.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/twalter

Walter,  Thomas
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Smirnov,  Sergey Z.
External Organizations;

Abkadyrov,  Ilyas
External Organizations;

Jakovlev,  Andrey
External Organizations;

Davydova,  Vesta
External Organizations;

Senyukov,  Sergey
External Organizations;

Bushenkova,  Natalia
External Organizations;

Novgorodova,  Angelika
External Organizations;

Stupina,  Tatyana
External Organizations;

Droznina,  Svetlana Ya.
External Organizations;

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Fulltext (public)

5005591.pdf
(Publisher version), 6MB

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Citation

Koulakov, I., Plechov, P., Mania, R., Walter, T., Smirnov, S. Z., Abkadyrov, I., Jakovlev, A., Davydova, V., Senyukov, S., Bushenkova, N., Novgorodova, A., Stupina, T., Droznina, S. Y. (2021): Anatomy of the Bezymianny volcano merely before an explosive eruption on 20.12.2017. - Scientific Reports, 11, 1758.
https://doi.org/10.1038/s41598-021-81498-9


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5005591
Abstract
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.