Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...78..337n&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 78, Issue 3-4, p. 337-342.
Physics
35
Scientific paper
The splitting of SKS-waves shows that the fast velocity is commonly parallel to the trend of mountain belts. This has been related to the anisotropy induced by frozen mantle flow at lithospheric depth when the flow direction is parallel to mountain belts. This flow reflects a transcurrent motion parallel to the boundaries of the plates whose collision is responsible for mountain building. Considering the width of major shear zones, transcurrent flow should not reorient the mantle fabric on a transverse width larger than 20-40 km, unless the flow is partitioned between several major transcurrent shear zones. Therefore, such a scale seems to be too small to explain the SKS results. Another contribution to the observed mantle anisotropy is suggested to be the fabric induced by mantle flow during a prior event of rifting at the colliding plate boundaries which are derived from passive margins.
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