Mechanical Imaging of a Volcano Plumbing System From GNSS Unsupervised Modeling

Beauducel, François; Peltier, Aline; Villié, Antoine; Suryanto, Wiwit

doi:10.1029/2020gl089419

Cited by 22 publications

(18 citation statements)

References 28 publications

(43 reference statements)

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“…2c). This small amount of deformation can be modeled in real time using an unsupervised inverse problem and a compound dislocation model source (Nikkhoo et al, 2017;Beauducel, Peltier, et al, 2020). On 1 April, the pre-eruptive inflation was interpreted as being due to pressurization of a single source: an ellipsoid with a volume increase of 450;000 50;000 m 3 located at about 1 km below the Dolomieu crater (Fig.…”

Section: Eruption Precursorsmentioning

confidence: 99%

Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown

Peltier

Ferrazzini

Muro

et al. 2020

Seismological Research Letters

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In March 2020, the coronavirus disease 2019 outbreak was declared a pandemic by the World Health Organization and became a global health crisis. Authorities worldwide implemented lockdowns to restrict travel and social exchanges in a global effort to counter the pandemic. In France, and in French overseas departments, the lockdown was effective from 17 March to 11 May 2020. It was in this context that the 2–6 April 2020 eruption of Piton de la Fournaise (La Réunion Island, Indian Ocean) took place. Upon the announcement of the lockdown in France, a reduced activity plan was set up by the Institut de Physique du Globe de Paris, which manages the Observatoire Volcanologique du Piton de la Fournaise (OVPF). The aim was to (1) maintain remote monitoring operations by teleworking and (2) authorize fieldwork only for critical reasons, such as serious breakdowns of stations or transmission relays. This eruption provided an opportunity for the observatory to validate its capacity to manage a volcanic crisis with 100% remotely operated monitoring networks. We thus present the long- and short-term precursors to the eruption, and the evolution of the eruption recorded using the real-time monitoring data as communicated to the stakeholders. The data were from both continuously recording and transmitting field instruments as well as satellites. The volcano observatory staff remotely managed the volcano crisis with the various stakeholders based only on these remotely functioning networks. Monitoring duties were also assured in the absence of ad hoc field investigation of the eruption by observatory staff or face-to-face communications. The density and reliability of the OVPF networks, combined with satellite observations, allowed for trustworthy instrument-based monitoring of the eruption and continuity of the OVPF duties in issuing regular updates of volcanic activity in the context of a double crisis: volcanic and health.

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Section: Eruption Precursorsmentioning

confidence: 99%

Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown

Peltier

Ferrazzini

Muro

et al. 2020

Seismological Research Letters

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“…Finally, we also suggest further analysis of ground deformation and seismicity datasets or use of Bayesian inversion methods to model the source of deformation during magma migration at Piton de la Fournaise [50]. These data could improve our understanding of the different eruptive trends observed in this study.…”

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confidence: 76%

Lava Volume from Remote Sensing Data: Comparisons with Reverse Petrological Approaches for Two Types of Effusive Eruption

et al. 2022

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Five effusive eruptions of Piton de la Fournaise (La Réunion) are analyzed to investigate temporal trends of erupted mass and sulfur dioxide (SO2) emissions. Daily SO2 emissions are acquired from three ultraviolet (UV) satellite instruments (the Ozone Monitoring Instrument (OMI), the Ozone Mapping and Profiler Suite (OMPS), and the Tropospheric Monitoring Instrument (TROPOMI)) and an array of ground-based UV spectrometers (Network for Observation of Volcanic and Atmospheric Change (NOVAC)). Time-averaged lava discharge rates (TADRs) are obtained from two automatic satellite-based hot spot detection systems: MIROVA and MODVOLC. Assuming that the lava volumes measured in the field are accurate, the MIROVA system gave the best estimation of erupted volume among the methods investigated. We use a reverse petrological method to constrain pre-eruptive magmatic sulfur contents based on observed SO2 emissions and lava volumes. We also show that a direct petrological approach using SO2 data might be a viable alternative for TADR estimation during cloudy weather that compromises hot spot detection. In several eruptions we observed a terminal increase in TADR and SO2 emissions after initial emission of evolved degassed magma. We ascribe this to input of deeper, volatile-rich magma into the plumbing system towards the end of these eruptions. Furthermore, we find no evidence of volatile excess in the five eruptions studied, which were thus mostly fed by shallow degassed magma.

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“…Beside difficulties in implementing the FEM, such as meshing issues, this powerful method is computationally too demanding to be used for detailed inverse modeling. In contrast, the point CDM is a half‐space model, but has already proven to be suitable for exploring the parameter space in both detailed Bayesian inferences (see Lundgren et al., 2017) and rapid and unsupervised inversions of deformation data (see Beauducel et al., 2020). The gravity change solutions for the point CDM, which we provide here, extend this potential to joint inversions of surface displacements and gravity changes.…”

Section: Discussionmentioning

confidence: 99%

Analytical Solutions for Gravity Changes Caused by Triaxial Volumetric Sources

Nikkhoo

Rivalta

2022

Geophysical Research Letters

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Intrusion of magma through the host rock or into an existing magma chamber deforms the Earth's crust and also changes the surface gravity field. The intrusion mass is a key parameter for characterizing the nature of the activity and its future evolution. Joint analyses of the measured surface displacements and gravity changes can constrain the intrusion mass, beside the other parameters of the deformation source, that is, its location, shape,

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Mechanical Imaging of a Volcano Plumbing System From GNSS Unsupervised Modeling

Cited by 22 publications

References 28 publications

Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown

Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown

Lava Volume from Remote Sensing Data: Comparisons with Reverse Petrological Approaches for Two Types of Effusive Eruption

Analytical Solutions for Gravity Changes Caused by Triaxial Volumetric Sources

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