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Frozen and active seismic anisotropy beneath southern Africa
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| Zeitschriftentitel: | Geophysical Research Letters |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Geophysical Research Letters, 39, 2012, 8 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
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Vinnik, L. Kiselev, S. Weber, M. Oreshin, S. Makeyeva, L. Vinnik, L. Kiselev, S. Weber, M. Oreshin, S. Makeyeva, L. |
|---|---|
| author |
Vinnik, L. Kiselev, S. Weber, M. Oreshin, S. Makeyeva, L. |
| spellingShingle |
Vinnik, L. Kiselev, S. Weber, M. Oreshin, S. Makeyeva, L. Geophysical Research Letters Frozen and active seismic anisotropy beneath southern Africa General Earth and Planetary Sciences Geophysics |
| author_sort |
vinnik, l. |
| spelling |
Vinnik, L. Kiselev, S. Weber, M. Oreshin, S. Makeyeva, L. 0094-8276 1944-8007 American Geophysical Union (AGU) General Earth and Planetary Sciences Geophysics http://dx.doi.org/10.1029/2012gl051326 <jats:p>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.</jats:p> Frozen and active seismic anisotropy beneath southern Africa Geophysical Research Letters |
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Frozen and active seismic anisotropy beneath southern Africa |
| title_unstemmed |
Frozen and active seismic anisotropy beneath southern Africa |
| title_full |
Frozen and active seismic anisotropy beneath southern Africa |
| title_fullStr |
Frozen and active seismic anisotropy beneath southern Africa |
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Frozen and active seismic anisotropy beneath southern Africa |
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Frozen and active seismic anisotropy beneath southern Africa |
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frozen and active seismic anisotropy beneath southern africa |
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General Earth and Planetary Sciences Geophysics |
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http://dx.doi.org/10.1029/2012gl051326 |
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2012 |
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<jats:p>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.</jats:p> |
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| author | Vinnik, L., Kiselev, S., Weber, M., Oreshin, S., Makeyeva, L. |
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| description | <jats:p>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.</jats:p> |
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| spelling | Vinnik, L. Kiselev, S. Weber, M. Oreshin, S. Makeyeva, L. 0094-8276 1944-8007 American Geophysical Union (AGU) General Earth and Planetary Sciences Geophysics http://dx.doi.org/10.1029/2012gl051326 <jats:p>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.</jats:p> Frozen and active seismic anisotropy beneath southern Africa Geophysical Research Letters |
| spellingShingle | Vinnik, L., Kiselev, S., Weber, M., Oreshin, S., Makeyeva, L., Geophysical Research Letters, Frozen and active seismic anisotropy beneath southern Africa, General Earth and Planetary Sciences, Geophysics |
| title | Frozen and active seismic anisotropy beneath southern Africa |
| title_full | Frozen and active seismic anisotropy beneath southern Africa |
| title_fullStr | Frozen and active seismic anisotropy beneath southern Africa |
| title_full_unstemmed | Frozen and active seismic anisotropy beneath southern Africa |
| title_short | Frozen and active seismic anisotropy beneath southern Africa |
| title_sort | frozen and active seismic anisotropy beneath southern africa |
| title_unstemmed | Frozen and active seismic anisotropy beneath southern Africa |
| topic | General Earth and Planetary Sciences, Geophysics |
| url | http://dx.doi.org/10.1029/2012gl051326 |