The depth distribution of azimuthal anisotropy in the continental upper mantle

Federica Marone and Barbara Romanowicz ()
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Federica Marone: Berkeley Seismological Laboratory, 209 McCone Hall, Berkeley, California 94720, USA
Barbara Romanowicz: Berkeley Seismological Laboratory, 209 McCone Hall, Berkeley, California 94720, USA

Nature, 2007, vol. 447, issue 7141, 198-201

Abstract: Evidence for the presence of two layers of anisotropy with different orientations in the North American upper mantle is presented. At asthenospheric depths, the fast axis is sub-parallel to the plate motion, confirming the presence of shear related to current tectonic processes, whereas within the lithosphere, the orientation is significantly different, indicating that anisotropy at these shallower depths was 'frozen-in' long ago.

Date: 2007
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DOI: 10.1038/nature05742

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