Results 1 to 10 of about 186,723 (251)
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.
W. R. Peltier +2 more
exaly +2 more sources
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
exaly +8 more sources
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
exaly +4 more sources
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, 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
exaly +2 more sources
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
exaly +2 more sources
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.
Paolo Gasperini
exaly +3 more sources
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 ...
Alexandre Boughanemi, Anthony Mémin
doaj +3 more sources
A shallow approximation for ice streams sliding over strong beds
Journal of Glaciology, 2023 Ice streams are regions of rapid ice sheet flow characterised by a high degree of sliding over a deforming bed. The shallow shelf approximation (SSA) provides a convenient way to obtain closed-form approximations of the velocity and flux in a rapidly ...
Katarzyna L. P. Warburton +3 more
doaj +1 more source
Thermal controls on ice stream shear margins
Journal of Glaciology, 2021 Ice stream discharge responds to a balance between gravity, basal friction and lateral drag. Appreciable viscous heating occurs in shear margins between ice streams and adjacent slow-moving ice ridges, altering the temperature-dependent viscosity ...
Pierce Hunter +4 more
doaj +1 more source
Effects of impurities on the ice microstructure of Monte Perdido Glacier, Central Pyrenees, NE Spain
Annals of Glaciology, 2023 Monte Perdido Glacier, located in the central Pyrenees, is one of the southernmost glaciers in Europe. Due to climate change, this glacier is suffering an accelerated mass loss, especially in the last decades.
Nicolás González-Santacruz +5 more
doaj +1 more source