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Decade-long study of degassing at Kudriavy volcano, Iturup, Kurile Islands (1990–1999): Gas temperature and composition variations, and occurrence of 1999 phreatic eruption

Korzhinsky Mikhail A., Botcharnikov Roman E., Tkachenko Sergey I., Steinberg Genrikh S. (2002) Decade-long study of degassing at Kudriavy volcano, Iturup, Kurile Islands (1990–1999): Gas temperature and composition variations, and occurrence of 1999 phreatic eruption // Earth, Planets and Space. Vol. 54, No. 3. pp. 337-347. doi: 10.1186/BF03353032.

Full text not available from this repository.

Official URL: http://doi.org/10.1186/BF03353032

Abstract

A high-temperature (up to 940°C) fumarolic activity at Kudriavy volcano had been studied during 1990–1999. The maximum gas temperatures of the fumaroles were measured in 1992 as 940°C, then gradually decreased with time and reached to 907°C in 1999. Gas composition of the high-temperature fumarole became enriched in H2O and depleted in other gas components, in particular in CO2. Hydrogen isotopic compositions of the high-temperature fumarolic gases were gradually depleted in deuterium. The gradual and continuous decrease in temperature and changes in gas composition observed during the last 10-year suggest that a magmatic melt have been degassing in a relatively steady-state manner from a single magma chamber. The detail investigations in 1998 and 1999 revealed short-term changes in gas composition characterized by sporadic increases in H2, CO2, and Stotal after intense precipitations. Small-scale eruptions occurred on October 7, 1999 at the summit. The ratios of major gas components (C/S, C/Cl, S/Cl, C/F, S/F, and Cl/F) significantly increased just prior to the eruption. The eruption at the Kudriavy volcano in 1999 was likely a phreatic eruption as a result of the intense precipitations after unusually long dry period. Meteoric water penetrated into the hot zone of volcano edifice and rapidly boiled causing the eruption.
Item Type: Article
Title: Decade-long study of degassing at Kudriavy volcano, Iturup, Kurile Islands (1990–1999): Gas temperature and composition variations, and occurrence of 1999 phreatic eruption
Language: English
Journal or Publication Title: Earth, Planets and Space
ISSN Print: 1880-5981
Subjects: Volcanoes > 1 Volcanoes of the Kurile-Kamchatka Region > 1.2 Kurile Islands > Kudryavy
Depositing User: И.М. Романова
Date Deposited: 26 Nov 2021 00:41
Last Modified: 26 Nov 2021 00:41
URI: http://repo.kscnet.ru/id/eprint/4208

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