Bezymianny volcano eruption on December 20, 2017

Гирина, О.А.; Loupian, Е.А.; Melnikov, D.V.; Manevich, A.G.; Сорокин, А. А.; Kramareva, L.S.; Uvarov, I.A.; Kashnitskiy, А.В.

doi:10.21046/2070-7401-2018-15-3-88-99

Cited by 10 publications

(10 citation statements)

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“…According to the satellite data, the pyroclastic flow drift length was 6 km and that of mud flows was up to 18 km. Based on the modeling estimates of eruptive cloud motion, the erupted tephra mass on the land was ~ 3•107 t (~0.023 km 3 ) [9]. Three eruptions of Bezymyanniy volcano described in table 2 were accompanied by dirty thunderstorms.…”

Section: Data and Analysismentioning

confidence: 99%

Dirty thunderstorms caused by volcano explosive eruptions in Kamchatka by the data of electromagnetic radiation

Малкин

Cherneva

Фирстов

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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During volcano eruptions, so called dirty thunderstorms are the sources of electromagnetic radiation. They are caused by ash-gas clouds formed during explosive eruptions. Thunderstorm activity in an ash-gas cloud during volcano eruption is monitored by radio equipment. The VLF direction finder, located at Paratunka, monitors thunderstorm activity in the region of Kamchatka Peninsula including dirty thunderstorms accompanying explosive eruptions of Shiveluch and Bezymyanniy volcanoes. In the paper, we analyze records of electromagnetic radiation associated with dirty thunderstorms occurring during volcano eruptions from 2017 to 2020. During that period 24 eruptions of Shiveluch volcano and 5 eruptions of Bezymyanniy volcano occurred. Seventeen and three of them, respectively, caused dirty thunderstorms. Two-stage scenario of development is typical for all the dirty thunderstorms. The first stage lasts for 5–7 minutes and accompanies eruptive column development. However, if the eruption begins according to a smooth scenario, the first stage may be weak. The second stage lasts for 20–80 minutes and is associated with eruptive cloud formation and propagation. The intensity of this dirty thunderstorm stage depends on eruption power as well as on the interaction of an eruptive cloud during its propagation with the clouds of meteorological origin. Based on the obtained data, that is indicated by the increase of cloud-to-cloud stroke number.

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Section: Data and Analysismentioning

confidence: 99%

Dirty thunderstorms caused by volcano explosive eruptions in Kamchatka by the data of electromagnetic radiation

Малкин

Cherneva

Фирстов

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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“…All these recent eruptions occurred inside the 1956 sector collapse amphitheater, by today forming a steep central stratocone with a relative elevation of about 850 m (the total height of Bezymianny is 3020 m) 25 . One of the strongest recent eruptions at Bezymianny occurred on 20 December 2017 26 . Based on elevated rockfall activity in parts associated with exponentially increased seismicity rates, this event was anticipated by the Kamchatka Branch of Geophysical Survey (KBGS), which issued alert documents two days prior to the eruption 27 .…”

Section: Introductionmentioning

confidence: 99%

“…Telemetric video cameras at distance operated by KBGS 28 showed that this explosion was short (15–30 min) but powerful enough to produce an approximately 15-km-high ash plume (Fig. S1 of Supplementary) and deposited tephra over an area of 42,000 km 2 26 . Visual signatures of the forthcoming eruption, such as rock falls and elevated degassing, can also be examined by three time-lapse cameras installed by us at the vicinity of Bezymianny (Fig.…”

Section: Introductionmentioning

confidence: 99%

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

Koulakov

Plechov

Mania

et al. 2021

Sci Rep

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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.

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“…A combined seismic and geodetic data analysis the second half of 2017 greatly advanced our understanding of Bezymianny's magma plumbing system (Figure 1B), where seismicity and summit deformations were recorded before, during, and after the December 20, 2017 eruption, which was one of the largest eruptions in recent times producing a 15-km-high ash column (Girina et al, 2018;Koulakov et al, 2021). Related seismic tomography results revealed two closely neighboring, strong seismic anomalies that stretch down from 2 km to >6 km below the surface (Koulakov et al, 2021).…”

Section: Study Areamentioning

confidence: 99%

Inflating Shallow Plumbing System of Bezymianny Volcano, Kamchatka, Studied by InSAR and Seismicity Data Prior to the 20 December 2017 Eruption

et al. 2021

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Explosive eruptions at steep-sided volcanoes may develop with complex precursor activity occurring in a poorly-understood magma plumbing system so that timelines and possible interactions with the geologic surrounding are often unresolved. Here we investigate the episode prior to the energetic December 20, 2017 eruption at Bezymianny volcano, Kamchatka. We compare degassing activity inferred from time-lapse camera images, seismicity and real-time seismic amplitude (RSAM) data derived from a temporary station network, as well as high-resolution InSAR displacement maps. Results show that the first changes can be identified in low-frequency seismicity and degassing at least 90 days before the eruption, while the first volcano-tectonic (VT) seismicity occurred 50 days before the eruption. Coinciding with significant changes of the RSAM, surface displacements affect the volcanic flanks at least 9 days prior to the eruption. Inversion modeling of the pre-eruptive surface deformation as well as deflation-type, co-eruptive surface changes indicate the presence of a shallow and transient reservoir. We develop a conceptual model for Bezymianny volcano initiating with deep seismicity, followed by shallow events, rockfalls, steaming and an inflating reservoir. The eruption is then associated with subsidence, caused by deflation of the same reservoir. This sequence and conceivable causality of these observations are providing a valuable contribution to our understanding of the shallow magma plumbing system beneath Bezymianny and may have relevance for volcano monitoring and early warning strategies at similar volcanoes elsewhere.

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Bezymianny volcano eruption on December 20, 2017

Cited by 10 publications

References 1 publication

Dirty thunderstorms caused by volcano explosive eruptions in Kamchatka by the data of electromagnetic radiation

Dirty thunderstorms caused by volcano explosive eruptions in Kamchatka by the data of electromagnetic radiation

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

Inflating Shallow Plumbing System of Bezymianny Volcano, Kamchatka, Studied by InSAR and Seismicity Data Prior to the 20 December 2017 Eruption

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