Structure of the Kaapvaal craton from surface waves

Marion Freybourger, James B. Gaherty, Thomas H. Jordan

Research output: Contribution to journalArticlepeer-review

90 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2489-2492
Number of pages4
JournalGeophysical Research Letters
Issue number13
StatePublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences


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