HR: 1330h
AN: T32B-0937 [PDF]
TI: 3D Postglacial Rebound With Lateral Rheological Heterogeneities
AU: * Antonioli, A
EM: antonioli@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Roma, RM 00143
Italy
AU: Cianetti, S
EM: spina@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Roma, RM 00143
Italy
AU: Giunchi, C
EM: giunchi@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Roma, RM 00143
Italy
AU: Spada, G
EM: spada@fis.uniurb.it
AF: Universit\`a di Urbino, Istituto di Fisica, Via S.Chiara 27, Urbino, PU 61029
Italy
AB:
We study the Earth response to the melting of the Pleistocene ice sheets by a
numerical 3D FE approach. Starting from a reference spherically symmetric Earth
model, which has been successfully benchmarked with available solutions based
on the viscoelastic normal modes, we include laterally varying structures to
discriminate which kind of heterogeneities can be revealed by relative sealevel
and geodetic datasets. We focus on the lateral variations in the lithosphere
and upper mantle, and we assume a viscoelastic Maxwell linear rheology in all
of our computations. In the lithosphere we include a global regionalization
which accounts for oceanic, continental and cratonic provinces, whereas in the
upper mantle the main feature studied is a low-viscosity region beneath the
oceanic plates. Since a high-resolution analysis is not possible due to the
huge computer requirements of the FE model, our present analysis is adequate to
the study of the effects of the long-wavelength mantle heterogeneities. Our
preliminary results suggests that the departure from the spherical symmetry
can affect both the predicted relative sealevel curves and the present-day
rates of deformation measured by geodetic methods.
DE: 1213 Earth's interior--dynamics (8115, 8120)
DE: 1236 Rheology of the lithosphere and mantle (8160)
DE: 3210 Modeling
DE: 8159 Rheology--crust and lithosphere
SC: Tectonophysics [T]
MN: 2003 Fall Meeting