Results 11 to 20 of about 199,872 (251)
Effects of Andrade and Burgers Rheologies on Glacial Isostatic Adjustment Modeling in Antarctica
Geodesy and GeodynamicsVariations in ice mass deform the Earth and modify its gravity field, a process known as Glacial Isostatic Adjustment (GIA). GIA in Antarctica remains poorly constrained due to the cumulative effect of past and present ice-mass changes, the unknown ...
Anthony Mémin, Boughanemi Alexandre
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Modelling of mantle postglacial relaxation in axisymmetric geometry with a composite rheology and a glacial load interpolated by adjusted spherical harmonics analysis [PDF]
Geophysical Journal International, 2007 SUMMARY Although studies on glacial isostatic adjustment usually assume a purely linear rheology, we have previously shown that mantle relaxation after the melting of Laurentide ice sheet is better described by a composite rheology including a non-linear term.
DAL FORNO, GIULIO, GASPERINI, PAOLO
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Glacial Isostatic Adjustment Model With Composite 3-D Earth Rheology for Fennoscandia [PDF]
Geophysical Journal International, 2013 Models for glacial isostatic adjustment (GIA) can provide constraints on rheology of the mantle if past ice thickness variations are assumed to be known. The Pleistocene ice loading histories that are used to obtain such constraints are based on an a priori 1-D mantle viscosity profile that assumes a single deformation mechanism for mantle rocks.
Patrick Wu +2 more
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Post-Glacial Rebound and Transient Lower Mantle Rheology [PDF]
Geophysical Journal International, 1986 Summary. Although post-glacial rebound data have been conventionally interpreted as being governed by the steady state component of the mantle viscosity spectrum, the radial profile of this parameter, which is then inferred by fitting a model to observations, is characterized by the fact that it exhibits rather slight variation with depth.
William Richard Peltier
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Effects on Post-Glacial Rebound From the Hard Rheology in the Transition Zone [PDF]
Geophysical Journal International, 1992 The effect of an increase of viscosity in the earth-mantle's transition zone between 420 and 670 km on the geophysical signatures induced by postglacial rebound was analyzed using a self-gravitating model consisting of an elastic lithosphere, a three-layer viscoelastic mantle, and an inviscid core.
Giorgio Spada, Yanick Ricard, D A Yuen
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Geophysical Journal International, 2021 SUMMARY Studies of glacial isostatic adjustment (GIA) provide important constraints on the Earth's mantle viscosity. Most GIA models assume Newtonian viscosity through the mantle, but laboratory experimental studies of rock deformation, observational studies of seismic anisotropy, and modelling studies of mantle dynamics show that in the
Kaixuan Kang, Shijie Zhong, Wei Mao
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Ice-Age Ice-Sheet Rheology: Constraints From the Last Glacial Maximum Form of the Laurentide Ice Sheet [PDF]
Annals of Glaciology, 2000 AbstractState-of-the-art thermomechanical models of the modern Greenland ice sheet and the ancient Laurentide ice sheet that covered Canada at the Last Glacial Maximum (LGM) are not able to explain simultaneously the observed forms of these cryospheric structures when the same, anisotropy-enhanced, version of the conventional Glen flow law is employed ...
William Richard Peltier +2 more
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A Model for Spiral Flows in Basal Ice and the Formation of Subglacial Flutes Based on a Reiner-Rivlin Rheology for Glacial Ice [PDF]
Journal of Geophysical Research: Solid Earth, 2008 Flutes are elongated sediment ridges formed at the base of glaciers and ice sheets. In this paper, we show that flutes can be the product of a corkscrew‐like spiral flow in basal ice that removes sediment from troughs between flutes and deposits it at their crests, as first suggested by Shaw and Freschauf.
Christian G. Schoof, Garry K. C. Clarke
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Timescales of Glacial Isostatic Adjustment in Greenland: Is Transient Rheology Required?
Geophysical Journal InternationalSUMMARY The possibility of a transient rheological response to ice age loading, first discussed in the literature of the 1980s, has received renewed attention. Transient behaviour across centennial to millennial timescales has been invoked to reconcile apparently contradictory inferences of steady-state (Maxwell) viscosity based on two ...
Sarah Woodroffe +2 more
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Geophysical Journal International, 2017 Glacial Isostatic Adjustment (GIA) models commonly assume a mantle with a viscoelastic Maxwell rheology and a fixed ice history model. Here, we use a Bayesian Monte Carlo approach with a Markov chain formalism to invert the global GIA signal simultaneously for the mechanical properties of the mantle and the volumes of the ice sheets, using as starting ...
Lambert Caron +2 more
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