Yannick Guéhenneux

Laboratoire Magmas et Volcans

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Mathieu Gouhier

Laboratoire Magmas et Volcans

Philippe Labazuy

Laboratoire Magmas et Volcans

Andrew Harris

Centre National de la Recherche Scientifique

Sébastien Valade

Universidad Nacional Autónoma de México

Franck Donnadieu

Laboratoire Magmas et Volcans

Sonia Calvari

Istituto Nazionale di Geofisica e Vulcanologia

Philippe Cacault

Université Clermont Auvergne

S. Rivet

Institut de Recherche pour le Développement

Letizia Spampinato

Istituto Nazionale di Geofisica e Vulcanologia

Giuseppe Puglisi

Istituto Nazionale di Geofisica e Vulcanologia

Cooperative Institutions

Centre National de la Recherche Scientifique

Université Clermont Auvergne

Institut de Recherche pour le Développement

Laboratoire Magmas et Volcans

Observatoire de Physique du Globe de Clermont-Ferrand

Istituto Nazionale di Geofisica e Vulcanologia

Clermont Université

Université Paris Cité

Institut de physique du globe de Paris

INGV Osservatorio Etneo

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A year of lava fountaining at Etna: Volumes from SEVIRI

Geophysical Research Letters (2012)

Gaetana Ganci Andrew Harris Ciro Del Negro Yannick Guéhenneux Annalisa Cappello

We present a new method that uses cooling curves, apparent in high temporal resolution thermal data acquired by geostationary sensors, to estimate erupted volumes and mean output rates during short lava fountaining events. The 15 minute temporal resolution of the data allows phases of waxing and peak activity to be identified during short (150‐to‐810 minute‐long) events. Cooling curves, which decay over 8‐to‐21 hour‐periods following the fountaining event, can also be identified. Application to 19 fountaining events recorded at Etna by MSG's SEVIRI sensor between 10 January 2011 and 9 January 2012, yields a total erupted dense rock lava volume of ∼28 × 10 6 m 3 , with a maximum intensity of 227 m 3 s −1 being obtained for the 12 August 2011 event. The time‐averaged output over the year was 0.9 m 3 s −1 , this being the same as the rate that has characterized Etna's effusive activity for the last 40 years.

Temporal resolution

10.1029/2012gl051026

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Citations (93)

HOTVOLC: the official French satellite-based service for operational monitoring and early warning of volcanic ash plumes

Bulletin of Volcanology (2024)

Yannick Guéhenneux Mathieu Gouhier

Volcanic ash

10.1007/s00445-024-01716-w

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Citations (0)

Operational Response to Volcanic Ash Risks Using HOTVOLC Satellite-Based System and MOCAGE-Accident Model at the Toulouse VAAC

Atmosphere (2020)

Mathieu Gouhier Mathieu Deslandes Yannick Guéhenneux Philippe Héreil Philippe Cacault

In 2010, the Eyjafjallajökull volcano erupted, generating an ash cloud causing unprecedented disruption of European airspace. Despite an exceptional situation, both the London and Toulouse Volcanic Ash Advisory Centres (VAAC) provided critical information on the location of the cloud and on the concentration of ash, thus contributing to the crisis management. Since then, substantial efforts have been carried out by the scientific community in order to improve remote sensing techniques and numerical modeling. Satellite instruments have proven to be particularly relevant for the characterization of ash cloud properties and a great help in the operational management of volcanic risk. In this study, we present the satellite-based system HOTVOLC developed at the Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) using Meteosat geostationary satellite and designed for real-time monitoring of active volcanoes. After a brief presentation of the system we provide details on newly developed satellite products dedicated to the ash cloud characterization. This includes, in particular, ash cloud altitude and vertical column densities (VCD). Then, from the Stromboli 2018 paroxysm, we show how HOTVOLC can be used in a timely manner to assist the Toulouse VAAC in the operational management of the eruptive crisis. In the second part of the study, we provide parametric tests of the MOCAGE-Accident model run by the Toulouse VAAC from the April 17 Eyjafjallajökull eruption. For this purpose, we tested a range of eruption source parameters including the Total Grain Size Distribution (TGSD), the eruptive column profile, the top plume height and mass eruption rate (MER), as well as the fine ash partitioning. Finally, we make a comparison on this case study between HOTVOLC and MOCAGE-Accident VCD.

Volcanic ash

Cloud top

10.3390/atmos11080864

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Citations (29)

Monitoring the Eyjafjöll volcanic plume using OPGC platforms : remote sensing and in-situ measurements

EGUGA (2010)

Philippe Labazuy Mathieu Gouhier Maxime Hervo Patrick Fréville Boris Quehennen

(1) Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), INSU-CNRS, Univ. Blaise Pascal, Aubiere, France (P.Freville@opgc.univ-bpclermont.fr), (2) Laboratoire Magmas et Volcans (LMV), CNRS, IRD, OPGC, Univ. Blaise Pascal, Clermont-Ferrand, France (P.Labazuy@opgc.univ-bpclermont.fr), (3) Laboratoire de Meteorologie Physique (LaMP), CNRS, OPGC, Univ. Blaise Pascal, Aubiere, France (A.Colomb@opgc.univ-bpclermont.fr)

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Citations (2)

Lava discharge during Etna's January 2011 fire fountain tracked using MSG-SEVIRI

Bulletin of Volcanology (2011)

Mathieu Gouhier Andrew Harris Sonia Calvari Philippe Labazuy Yannick Guéhenneux

Effusive eruption

10.1007/s00445-011-0572-y

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Citations (41)

Response of Fogo volcano (Cape Verde) to lunisolar gravitational forces during the 2014–2015 eruption

Physics of The Earth and Planetary Interiors (2021)

Stéphanie Dumont Graça Silveira Susana Custódio Fernando Lopes Jean‐Louis Le Mouël

Cape verde

Vulcanian eruption

Strombolian eruption

10.1016/j.pepi.2021.106659

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Citations (16)

Improved space borne detection of volcanic ash for real-time monitoring using 3-Band method

Journal of Volcanology and Geothermal Research (2015)

Yannick Guéhenneux Mathieu Gouhier Philippe Labazuy

Volcanic ash

Extinction (optical mineralogy)

10.1016/j.jvolgeores.2015.01.005

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Citations (38)

Mass Eruption Rates of Tephra Plumes During the 2011–2015 Lava Fountain Paroxysms at Mt. Etna From Doppler Radar Retrievals

Frontiers in Earth Science (2018)

Valentin Freret-Lorgeril Franck Donnadieu Simona Scollo Ariel Provost Patrick Fréville

Real-time estimation of eruptive source parameters during explosive volcanic eruptions is a major challenge in terms of hazard evaluation and risk assessment as these inputs are essential for tephra dispersal models to forecast the impact of ash plumes and tephra deposits. Between 2011 and 2015, Etna volcano has produced 49 paroxysms characterized by lava fountains generating tephra plumes that reached up to 15 km a.s.l.. We analyzed these paroxysms using the 23.5 cm wavelength Doppler radar (VOLDORAD 2B) signals along with visible camera images of the monitoring network of the Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo. Range gating of the radar beam allows the identification of the active summit craters in real-time, no matter the meteorological conditions. The radar echoes help to mark (i) the onset of the paroxysm when unstable lava fountains, progressively taking over Strombolian activity, continuously supply the developing tephra plume, then (ii) the transition to stable fountains (climax), and (iii) the end of the climax with a waning phase, therefore providing paroxysm durations. We developed a new methodology to retrieve in real-time a Mass Eruption Rate (MER) proxy from the radar echo power and maximum Doppler velocity measured near the emission source. The increase in MER proxies is found to precede by several minutes the time variations of plume heights inferred from visible and X-Band radar imagery. A calibration of the MER proxy against ascent models based on observed plume heights leads to radar-derived climax MER from 2.96 × 104 to 3.26 × 106 kg s-1. The total erupted mass (TEM) of tephra was computed by integrating over beam volumes and paroxysm duration, allowing quantitative comparisons of the relative amounts of emitted tephra among the different paroxysms. When the climactic phase can be identified, it is found to frequently release 76% of the TEM. Calibrated TEMs are found to be larger than those retrieved by satellite and X-band radar observations, deposit analyses, ground-based infrared imagery or dispersion modeling. The radar-derived mass load parameters therefore represent a very powerful all-weather tool for the quantitative monitoring and real-time hazard assessment of tephra plumes at Etna.

10.3389/feart.2018.00073

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Citations (46)

CNES-ESA satellite contribution to the operational monitoring of volcanic activity: The 2021 Icelandic eruption of Mt. Fagradalsfjall

Journal of Applied Volcanology (2022)

Mathieu Gouhier Virginie Pinel Joaquín M. C. Belart Marcello de Michele Catherine Proy

Abstract Within the framework of the CIEST 2 (Cellule d'Intervention d'Expertise Scientifique et Technique new generation) and thanks to the support of CNES, the French space agency, the first phase of the Fagradalsfjall eruption was exceptionally well covered by high resolution optical satellite data, through daily acquisitions of Pléiades images in stereo mode. In this study, we show how Pléiades data provided real-time information useful for the operational monitoring of the ongoing eruption. An estimation of the volume of lava emitted as well as the corresponding effusion rate could be derived and delivered to the civil protection less than 6 h after the data acquisition. This information is complementary to and consistent with estimates obtained through the HOTVOLC service using SEVIRI (Spinning Enhanced Visible and Infrared Imager) sensor on-board Meteosat Second Generation (MGS) geostationary satellites, operated by the European Space Agency (ESA), characterized by a lower spatial resolution and a higher temporal one. In addition to the information provided on the lava emission, Pléiades data also helped characterize the intensity of the eruption by providing insight into the elevation and the velocity of the volcanic plume. The survey of this effusive eruption, well anticipated by a series of precursors, is a proof of concept of the efficiency of optical/thermal satellite data for volcanic crisis real-time monitoring.

Effusive eruption

10.1186/s13617-022-00120-3

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Citations (5)

Erratum to: Lava discharge during Etna’s January 2011 fire fountain tracked using MSG-SEVIRI

Bulletin of Volcanology (2012)

Mathieu Gouhier Andrew Harris Sonia Calvari Philippe Labazuy Yannick Guéhenneux

Fountain

10.1007/s00445-012-0614-0

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Citations (9)