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ELASTISCHE ANISOTROPIE IN TEKTONISCH VERFORMTEN SEDIMENTGESTEINEN*
- Source: Geophysical Prospecting, Volume 11, Issue 4, Oct 1963, p. 423 - 458
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- 27 Apr 2006
Abstract
Sedimentary rocks deformed by tectonic forces, especially sandstones, show anisotropy in their elastic behaviour. The velocity of longitudinal ultrasonic pulses in them varies with direction. In three directions perpendicular to each other, velocities are extreme. These directions are parallel to the tectonic axes.
In such rocks grains are arranged according to their shape. This special orientation developed during the tectonic deformation, which can also be recognized by deformed fossils.
A close relation exists between the anisotropy and the arrangement of the grains. A model of the sediment with grains arranged in a similar manner as in natural sandstones is tested mathematically for its elastic behaviour. Anisotropy similar to that of natural sandstones is exhibited by this model.