Title: Thin-Shell Dynamics of Geophysical Subduction
Speaker: Neil Ribe, Université Paris-Saclay
Abstract: Subduction on Earth is the process whereby the planet’s stiff and dense outer shell (the lithosphere) sinks into the mantle below while deforming in complex ways over periods of millions of years. Because the typical Reynolds number of subduction-related flow is 10^(-20). understanding the process requires
the theory of low Reynolds number hydrodynamics. Using a variety of idealized models of subduction in both Cartesian and spherical geometries, we obtain numerical flow solutions using the boundary-element method and interpret
these using the theory of thin viscous shells. Aspects to be emphasized
in this talk include the key lengthscales and dimensionless numbers that
control subduction; the physical factors that determine which of several
modes or styles of subduction is selected under given conditions; the
complex state of stress in doubly-curved subducted shells; and the
potential role of buckling instabilities during subduction.
Bio: Neil M. Ribe received his PhD in Geophysical Sciences from the University
of Chicago in 1981. After postdoctoral work at Columbia Unversity, he
joined the faculty of the Department of Geology and Geophysics at Yale
University. In 2000 he moved to France to take up a position with the
CNRS, first at the Paris Geophysical Institute (IPGP) and then (since 2009)
at the FAST laboratory in Orsay. He is a specialist in low Reynolds number
hydrodynamics, applied both to the dynamics of the Earth’s interior and
to a variety of problems in fundamental fluid mechanics and soft matter
physics.
Zoom: https://northwestern.zoom.us/j/96111431914
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