Structure of the Kaapvaal craton from surface waves

Publication Type: 
Year of Publication: 
2001
Journal Title: 
Geophysical Research Letters
Journal Date: 
Jul 1
Volume: 
28
Issue: 
13
Pages: 
2489-2492
ISBN Number: 
0094-8276
Accession Number: 
ISI:000169493700002
Abstract: 

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.

Notes: 

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