Frozen and active seismic anisotropy beneath southern Africa

Details Frozen and active seismic anisotropy beneath southern Africa Frozen and active seismic anisotropy beneath southern Africa

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3908301v&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 8, CiteID L08301

Physics

Seismology: Body Waves, Seismology: Mantle (1212, 1213, 8124), Seismology: Lithosphere (1236), Tectonophysics: Continental Cratons, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

P receiver functions from 23 stations of the SASE experiment in southern Africa are inverted simultaneously with SKS waveforms for azimuthal anisotropy in the upper mantle. Our analysis resolves the long-standing issue of depth dependence and origins of anisotropy beneath southern Africa. In the uppermost mantle we observe anisotropy with a nearly E-W fast direction, parallel to the trend of the Limpopo belt. This anisotropy may be frozen since the Archean. At a depth of 160 km the fast direction of anisotropy changes to 40° and becomes close to the recent plate motion direction. This transition is nearly coincident in depth with activation of dominant glide systems in olivine and with a pronounced change in other properties of the upper mantle. Another large change in the fast direction of anisotropy corresponds to the previously found low-S-velocity layer atop the 410-km discontinuity.

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