Laboratory modelling of complex rheologies

Coord.: F. Funiciello (UniRoma3) & A. Davaille (CNRS-FAST)

The 3 projects that compose this WP have in common the use of physical models and analog materials to study the effects of the complex rheology of Earth materials on the planet dynamics.

ESR6. Unraveling the subduction earthquake cycle through analogue modelling and the analysis of natural data. Supervisors: F. Funiciello (UNIROMA3). Secondments: Geosciences Montpellier & MP Strumenti
Objectives: Constrain the role of the rheology of the subduction plane and of the underlying mantle on the subduction earthquakes cycle by (1) formulating a conceptual model for the earthquake cycle, based on statistical analysis of natural data from convergent margins; and (2) validating the model by means of scaled laboratory experiments using a broad range of materials with different rheologies
Expected Results: A conceptual model for the earthquake cycle based on rheological laws for subduction plane and of the underlying mantle

ESR7. Convective instabilities in colloidal dispersions. Supervisors: N. Ribe & A. Davaille (CNRS-FAST). Secondments: Univ. Mainz (JGU) & SCHOTT
Objectives: Investigate the origin and morphology of convective instabilities in colloidal dispersions, using a model rheology based on the extensive rheometrical database that has been built up at FAST since 2010
Expected Results: A better understanding of the rheology of aqueous silica colloidal dispersions as a function of the concentration of the dispersed phase; a better understanding of the physical processes producing of plate tectonics in the laboratory models and in the Earth.

ESR8. From viscous plumes to dikes and fractures: influence of the rheology on the lithospheric response to planetary mantle upwellings. Supervisors: A. Davaille (CNRS-FAST). Secondments: ETH & Reykjavik Geothermal
Objectives: Investigate the conditions responsible for the different responses to mantle plume impacts, including volcanic plateaus, volcanoes, triple-junction rifting, and coronae by laboratory experiments using polymer gels and colloids, whose rheologies combine viscous, elastic and plastic aspects.
Expected Results: Regime diagrams and scaling laws derived from the experiments will allow the results to be applied to planetary dynamics.

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