Christelle Zielinski

Laboratoire Parole et Langage

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Michel Lardy

Institut de Recherche pour le Développement

Alexis Le Pichon

CEA DAM Île-de-France

S. Vergniolle

Institut de physique du globe de Paris

Philipson Bani

Laboratoire Magmas et Volcans

E. Garaébiti

Vanuatu Cultural Centre

S. Todman

P. Herry

CEA DAM Île-de-France

Viviane Souty

European-Mediterranean Seismological Centre

M. Frogneux

Institut de physique du globe de Paris

P. Millier

Cooperative Institutions

CEA DAM Île-de-France

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Centre National de la Recherche Scientifique

Institut de Recherche pour le Développement

Institut de physique du globe de Paris

Université Paris Cité

Institut de Recherche pour le Développement

University of New Caledonia

Vanuatu Cultural Centre

CEA Grenoble

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Multiyear validation of the NRL‐G2S wind fields using infrasound from Yasur

Journal of Geophysical Research Atmospheres (2007)

K. Antier Alexis Le Pichon S. Vergniolle Christelle Zielinski Michel Lardy

The Yasur volcano in the Vanuatu archipelago is an outstanding source of infrasonic waves due to its regular activity. This volcano is permanently monitored by the IS22 infrasound station located in New Caledonia, about 400 km from it, and by one microbarometer installed close to its crater. A multiyear monitoring of Yasur is proposed to validate consistently the Naval Research Laboratory Ground to Space (NRL‐G2S) semiempirical atmospheric model up to the stratosphere. The results of propagation modeling accurately explain seasonal changes as well as small short‐timescale variations of the infrasonic observables. The azimuthal deviation is predicted with an uncertainty in general lower than 0.5°. The fluctuations of the trace velocity and the celerity are simulated with errors as large as 5 m/s. This study demonstrates that the use of appropriate propagation tools along with the NRL‐G2S specifications provides accurate enough results for most of the long‐range observations for the purpose of operational infrasound monitoring.

10.1029/2007jd008462

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ACOUSTICS2008/3520 Close listening of a permanently degassing volcano : Yasur (Vanuatu)

Christelle Zielinski S. Vergniolle Michel Lardy Alexis Le Pichon M. Frogneux

Acoustic measurement is a very powerful technic to monitor gas volume and pressure at a safe distance of a volcano. Since eruptions are driven by a gas phase, acoustic recordings of eruptions can provide insights into the degassing processes. The permanent activity of Yasur volcano (Vanuatu) has been acoustically monitored continously to detect and understand the sudden increases in the volcanic degassing. In the absence of appropriate modelling of the sound source, we have used a dimensionless analysis of our infrasonic records close to the source to relate acoustic power and the velocity of the gas - ejecta mixture. Our one-year data set at the source shows several sudden increases in gas flux over one week as well as more progressive evolution, over several months. Explosions are also detected using a method based on wavelet decomposition. This shows that most of the changes in gas flux are related to strong changes in the number of explosions. Understanding the origin of these variations has strong implications for hazards assessments.

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A Precursory Phase to a Sudden Enhanced Activity at Yasur volcano (Vanuatu) : Insights from Simultaneous Infrasonic and Seismic Records

AGU Fall Meeting Abstracts (2015)

S. Vergniolle Christelle Zielinski Jean Battaglia J. P. Métaxian Philipson Bani

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The potential of continuous near-field recording of infrasound produced by volcanoes in Vanuatu for probing the the state of the atmosphere

HAL (Le Centre pour la Communication Scientifique Directe) (2010)

Christelle Zielinski S. Vergniolle Philipson Bani Michel Lardy Alexis Le Pichon

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Long-times series of infrasonic records at open-vents volcanoes (Yasur volcano, Vanuatu, 2003-2014): the remarkable temporal stability of magma viscosity

AGU Fall Meeting Abstracts (2017)

S. Vergniolle Viviane Souty Christelle Zielinski Philipson Bani Alexis Le Pichon

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Insights into the temporal evolution of Strombolian activity at Yasur volcano (Vanuatu) from the source of infrasound

AGU Fall Meeting Abstracts (2019)

S. Vergniolle Viviane Souty Christelle Zielinski Philipson Bani Alexis Le Pichon

Strombolian eruption

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Close listening of a permanently degassing volcano: Yasur (Vanuatu)

The Journal of the Acoustical Society of America (2008)

Christelle Zielinski S. Vergniolle Michel Lardy Alexis Le Pichon M. Frogneux

Acoustic measurement is a very powerful technique to monitor gas volume and pressure at a safe distance of a volcano. Since eruptions are driven by a gas phase, acoustic recordings of eruptions can provide insights into the degassing processes. The permanent activity of Yasur volcano (Vanuatu) has been acoustically monitored continously to detect and understand the sudden increases in the volcanic degassing. In the absence of appropriate modeling of the sound source, we have used a dimensionless analysis of our infrasonic records close to the source to relate acoustic power and the velocity of the gas - ejecta mixture. Our one-year dataset at the source shows several sudden increases in gas flux over one week as well as more progressive evolution, over several months. Explosions are also detected using a method based on wavelet decomposition. This shows that most of the changes in gas flux are related to strong changes in the number of explosions. Understanding the origin of these variations has strong implications for hazards assessments.

10.1121/1.2935635

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Multiyear validation of the NRL-G2S wind fields using infrasound from Yasur - art. no. D23110

Journal of Geophysical Research Atmospheres (2007)

K. Antier Alexis Le Pichon S. Vergniolle Christelle Zielinski Michel Lardy

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A quantitative definition of Strombolian activity based on simultaneous infrasonic and thermal records : Erta Ale (Ethiopia), Piton de la Fournaise (Réunion) and Yasur (Vanuatu) volcanoes

AGUFM (2018)

S. Vergniolle Viviane Souty Y. Gaudemer Christelle Zielinski Philipson Bani