Anisotropy and large-scale lateral inhomogeneity of the upper mantle

Details Anisotropy and large-scale lateral inhomogeneity of the upper mantle Anisotropy and large-scale lateral inhomogeneity of the upper mantle

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...26..171k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 26, Issue 3, p. 171-178.

Physics

9

Scientific paper

An investigation of travel-time residuals of P waves as compared to an average global travel-time curve with a base-line determined shows that about 400-500 km of the upper mantle at the boundary with the crust and a similar thickness of the lower mantle at the boundary with the core are laterally inhomogeneous. The upper mantle both under continents and under oceans consists of crust-mantle blocks distinguished by longitudinal wave velocity, surface tectonics and intensity of the heat flow. It has been revealed that within individual crust-mantle blocks there is an azimuthal relationship of P-wave travel-time indicative of possible anisotropy of upper mantle elastic properties down to depths of the order of several hundred kilometers.

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