Structure of the Kaapvaal Craton from surface waves

Phase delays of Rayleigh and Love waves from teleseismic earthquakes recorded during the Southern Africa Seismic Experiment have been inverted for upper‐mantle seismic velocities along the propagation paths and beneath the station array. Successful models of subarray structure displayed significant...

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Bibliographic Details
Published inGeophysical research letters Vol. 28; no. 13; pp. 2489 - 2492
Main Authors Freybourger, Marion, Gaherty, James B., Jordan, Thomas H.
Format Journal Article
LanguageEnglish
Published Blackwell Publishing Ltd 01.07.2001
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Summary:Phase delays of Rayleigh and Love waves from teleseismic earthquakes recorded during the Southern Africa Seismic Experiment have been inverted for upper‐mantle seismic velocities along the propagation paths and beneath the station array. Successful models of subarray structure displayed significant radial anisotropy in the uppermost mantle but no shear‐wave low‐velocity zone, supporting the hypothesis that the lithosphere beneath the Kaapvaal craton is thick. The azimuthal variations of Rayleigh‐wave slowness are not consistent with simple models based on SKS splitting observations and anisotropy measurements of Kaapvaal mantle xenoliths. This discrepancy may imply some amount of small‐scale heterogeneity in anisotropy.
Bibliography:ark:/67375/WNG-GCT2N0R8-S
ArticleID:2000GL012436
istex:C89AACA87DA75CD94933BCE5120633A5365130D7
ISSN:0094-8276
1944-8007
DOI:10.1029/2000GL012436