[Geoqus] Modelling flat or spherical?

[Gabriele Morra]

Hi Andre
  we have in press also a paper on the effects of earth sphericity on  
trench deformation in subduction and the effects of earth curvature  
are visible but small for a 2000km wide plate. We used abaqus for it.  
You can have a look on:

G. Morra, K. Regenauer-Lieb and D. Giardini
Curvature of Oceanic Arcs
Geology, in press in October 2006 PDF

the pdf is on
http://www.gfd.geophys.ethz.ch/~gabrielemorra/
you can compare those effects with the one that you obtain from rebound.

Gabriele

On Jul 26, 2006, at 12:48 PM, Andre Gebauer wrote:

> Dear GEOQUS-members,
>
> I have a little problem. The model that should be created has a  
> dimension of
> 1800x1800x760 km (l w h ). This model should show vertical  
> deformations by
> loading of  air pressure (not considered is the  attraction effect  
> of the
> airmass). The vertical displacement is only determined of several  
> singular
> places. So only the nearer proximity of the places is viewed.
> Now the question: Should this model be calculated spherical?
> The most papers says – no. f. e.:
>
> Wolf, D. (1984). The relaxation of spherical and flat Maxwell Earth  
> models
> and effects due to the presence of the lithosphere. J. Geophys., 56,
> 24-33.
>
> Amelung, F. and Wolf, D. (1994). Viscoelastic perturbations of the  
> Earth:
> significance of the incremental gravitational force in models of  
> glacial
> isostasy. Geophys. J. Int., 117 (3), 864-879.
>
> Wu, P. and Johnston, P. (1998). Validity of using flat-earth finite
> element models in the study of postglacial rebound. In P. Wu, editor,
> Dynamics of the Ice Age Earth: A Modern Perspective, pages 191-202.  
> Trans
> Tech Pub., Zurich, Switzerland.
>
> Wu, P., Z. Ni & G. Kaufmann, Postglacial Rebound with Lateral  
> Heterogeneities :
> from 2D to 3D modeling.in "Dynamics of the Ice Age Earth: A Modern  
> Perspective"
> edited by P.Wu, Trans Tech Publ., Switzerland, p.557-582 (1998).
>
> But someone gave me some doubts. If you have other papers or  
> results for
> modeling with flat earth please send them to me.
>
>
> Cheers,
> André Gebauer
>
>
>
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