CE49 - Planétologie, structure et histoire de la Terre

SCANning volcanoes with ground and airborne geophysics: toward an integrated 4D modeling of VOLCanic dynamics – Scan4Volc

Submission summary

Imaging the causal relation between observable, deep volcanic structures and manifestations in surface remains a great challenge in volcanology in order to prevent eruptive hazards. The behavior of volcanic systems (magmatic and hydrothermal) strongly depends on physical parameters, efficiently addressed using geophysical approaches. Resistivity and magnetic methods are particularly relevant, being very sensitive to fluid contents, alteration and temperature. This project aims to implement innovative approaches (deep 3D resistivity tomography, and repetition of airborne magnetic measurements) dedicated to 4D modeling of volcanic systems, by combining temporal 3D models from various integrated datasets. We focus on Piton de la Fournaise (PdF), a major target to address both scientific and societal objectives.
To make further progress on the knowledge of PdF both structure and dynamics, SCAN4VOLC project is structured in three complementary Work Packages (WP), each of them built to address a major task, whose outcomes will allow for better manage of the hazards that volcanic eruptions pose to populations and infrastructures.
WP1 is dedicated to a high-resolution multi-disciplinary imaging of PdF using recent improvements in geophysical methods (3D resistivity approaches, UAV’s magnetic measurements). Innovative 3D electrical tomography approaches will be combined with deep 1D magnetotellurics soundings, high-resolution UAV’s magnetic imaging, and thermal IR mapping. Such a coupling will help to precisely characterize the geometry of structurally-weak zones, magmatic and hydrothermal systems. Time lapses through the repetitions of measurements over time and activity stages will contribute to quantify the spatio-temporal evolution of the dynamics.
WP2 aims to a 4D modelling of resistivity and magnetic datasets through an integrated multi parametric approach. Geophysical data acquired on the field in the frame of WP1 will be modelled in 4D using 1) dedicated numerical modeling approaches, 2) constraints from laboratory experiments on the physical properties of carefully selected samples (e.g. resistivity, magnetization, porosity, permeability), and 3) additional multi-disciplinary parameters from observations and research from various groups (e.g. deformation, seismicity, fluids).
WP3 focuses on management, public communication and the transfer of expertise around hazards assessments in relation with magmatic and hydrothermal dynamics (phreato-magmatic and phreatic eruption), and mechanical heterogeneities at depth (preferential pathways, instabilities). Communication with Civil protection authorities and risk stakeholders, taking advantage of expertise from social science is fundamental to better predict the repercussions of volcanic crises.
Based on a solid experience in the envisioned fields, the knowledge gained from the geophysical studies will be transfer to the scientific community in order to reinforce the knowledge of other volcanoes worldwide. Such an integrated approach will contribute to implement deep learning algorithms on various targets over the world.

Project coordination

Lydie Gailler (LABORATOIRE MAGMAS ET VOLCANS)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

LMV LABORATOIRE MAGMAS ET VOLCANS

Help of the ANR 458,304 euros
Beginning and duration of the scientific project: December 2021 - 48 Months

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