Séminaire ISTerre

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Modelling rheological transitions within the solid Earth

mercredi 30 mars 2022 - 10h00

Véronique Dansereau - ISTerre-Séminaire post-doc
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Earth’s materials, like rocks and ice, are known to exhibit a variety of mechanical behaviors, or rheologies, depending on the local temperature, fluid pressure, loading conditions as well as on the time and spatial scales at which they are observed. In the geophysical context of plate boundaries, fault zones, landslides and the Arctic Ocean, modelling their deformation therefore constitutes a multi-scale problem that lies between the fields of solid mechanics and fluid dynamics. My main research interest is to solve such problem by developing simple numerical models for these geophysical systems that can capture their complex behaviour by capturing their different mechanical regimes - granular, brittle, ductile, fluid - and the transitions between these regimes. Doing so, I exploit the similarities between the deformation mechanisms present in these different systems. In this presentation, I will first develop on these similarities. I will then briefly present a model that was developed to represent the brittle to fluid transition in the Arctic sea ice cover and how this model can be adapted to simulate the brittle to ductile transition observed in the vicinity of fault and subduction zones and the associated slow earthquake phenomena.

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Equipe organisatrice : Organisation labo

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères