Effects of lateral viscosity variations on postglacial rebound: an analytical approach

Date

1999

Authors

Kaufmann, G
Wolf, D

Journal Title

Journal ISSN

Volume Title

Publisher

Blackwell Publishing Ltd

Abstract

So far, interpretations of postglacial rebound have usually been based on the assumption of laterally homogeneous earth models. However, in view of the increasing evidence of the 3-D structure of the Earth's mantle, several studies on the effects of lateral variations of the viscosity on postglacial rebound have been completed during the last decade. In the present study, we consider load-induced viscoelastic and viscous perturbations of incompressible and vertically homogeneous flat earth models with lateral variations of the shear modulus and viscosity. The solution is obtained using a perturbation method and given in analytical form. Our results show that sinusoidal variations of the parameters of less than one order of magnitude can modify the vertical surface displacement associated with a model of the Fennoscandian ice sheet by several tens of metres. The modifications increase approximately in proportion to the amplitude of the lateral variations. The overall increase of the modifications with increasing wavelength is complicated in detail and also results in changes of the spatial and temporal distributions of the vertical surface displacement.

Description

Keywords

Keywords: crustal deformation; glacial rebound; heterogeneity; viscosity Glacial rebound; Lateral heterogeneity; Viscoelasticity

Citation

Source

Geophysical Journal International

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

Restricted until

2037-12-31