Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3209306v&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 9, CiteID L09306
Physics
8
Seismology: Body Waves, Seismology: Mantle (1212, 1213, 8124), Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), Tectonophysics: Rheology: Mantle (8033)
Scientific paper
The Lehmann discontinuity in the upper mantle is often interpreted as a boundary separating anisotropic and isotropic media. We demonstrate, however, that seismic anisotropy plays, if any, a minor role in the origin of the Lehmann discontinuity. Our data are obtained with S receiver function technique from recordings of the MOMA seismograph array in the eastern USA. Part of the data is processed with a new modification of this technique. We observe Sp phase converted from the Lehmann discontinuity at a depth around 200 km with comparable amplitudes and similar polarities in two azimuths differing by about 90°. Contrary to the observations, the polarity in the synthetic seismograms for models with azimuthal anisotropy is opposite for the azimuths differing by 90°. Radial anisotropy with a slow vertical direction results in the Sp phase with the polarity opposite to the observed one.
Farra Véronique
Kurnik E.
Vinnik Lev
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