The following demo fragment is extracted from the paper
Numerical analysis of geodynamic evolution of the Earth based on
a thermochemical model of mantle convection: 3-D model
by V. D. Kotelkin and L. I. Lobkovsky,
Russian Journal of Earth Sciences, Vol 6, No. 6, December 2004
(http://rjes.wdcb.ru/v06/tje04165/tje04165.htm or
http://www.agu.org/WPS/rjes/v06/tje04165/tje04165.htm)
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Animation 2
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To inspect the spatial configurations of overturns in more detail, states of the
mantle layer were treated in a special way and shown in Animation 2.
Removing all background
heterogeneities and some weak ones, an image adapted to 3-D perception could be
obtained by varying the transparency of the object studied. The treating process
retained only light heterogeneities (warm colors) in the upper mantle and heavy
heterogeneities (cool colors) in the lower mantle. Green admixed to
heterogeneities that are closer to the observer enhance the 3-D impression of
the visualized state. The resulting color composition imparts orange tints to
near light heterogeneities and light blue tints to near heavy ones. The thus-truncated
representation of the 3-D structure of the layer at the overturn time
moment is presented in three fragments titled Overturn 1, 3, and 5
(see Animation 2).
A better perception
of the 3-D structure is also facilitated by the rotation of the object about the
polar axis (with the observer being in the equatorial plane). At a qualitative
level, all overturns (except the first one) have the same mantle structure: the
intrusion of heavy material into the lower mantle has the form of a singly
connected cuplike region, and light material penetrates into the upper mantle in
the form of several separate superplumes.
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Animation 3
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Animation 3 displays a similar
3-D dynamics of alternative density inhomogeneities, but the
rotation of the layer takes place in this case during the process of evolution.
Cyclic dynamics of the asthenosphere is clearly seen in this Animation: light
material actively underplates the lithosphere during the mantle overturn, after
which the resulting layer slowly cools during two-stage convection.
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This demo is a sample of presentation of results of numerical simulation using
AVI animation.
Last updated on 5 February 2005.