Velocity structure of the continental upper mantle; evidence from Southern Africa

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doi: 10.1016/S0024-4937(99)00021-3
Authors:Priestley, K.
Author Affiliations:Primary:
University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Harvard University, United States
Volume Title:Composition, deep structure and evolution of continents
Volume Authors:van der Hilst, Rob D., editor; McDonough, William F.
Source:Lithos (Oslo), 48(1-4), p.45-56; International symposium on Composition, deep structure and evolution of continents, Cambridge, MA, Oct. 15-17, 1997, edited by Rob D. van der Hilst and William F. McDonough. Publisher: Elsevier, Amsterdam, International. ISSN: 0024-4937
Publication Date:1999
Note:In English. 33 refs.; illus., incl. geol. sketch map
Summary:The velocity model for southern Africa of Qiu et al. [Qiu, X., Priestley, K., McKenzie, D., 1996. Average lithospheric structure of southern Africa. Geophys. J. Int. 127, 563-587] is revised so as to satisfy both the regional seismic waveform data and the fundamental mode Rayleigh wave phase velocity data for the region. The revised S-wave model is similar to the original model of Qiu et al. except that the high velocity, upper mantle lid extends to 160 km depth in the revised model rather than to 120 km in the original model. Sensitivity tests of the regional seismic data show that the minimum velocity in the S-wave low velocity zone can be as high as 4.45 km s-1 compared to 4.32 km s-1 in the Qiu et al. model. The vertical S-wave travel time for the revised south African model is compared with the vertical S-wave travel times for the global tomographic models S12WM13 and S16B30, and they are found to be similar. Abstract Copyright (1999) Elsevier, B.V.
Sections:Physical properties of rocks and minerals
Subjects:Continental crust; Crust; Depth; Elastic waves; Geophysical methods; Geophysical surveys; Global; Guided waves; Lithosphere; Low-velocity zones; Mantle; Models; Rayleigh waves; Seismic methods; Seismic waves; Seismograms; Sensitivity analysis; Surface waves; Surveys; Tomography; Upper mantle; Velocity structure; Waveforms; Africa; Southern Africa
Abstract Numbers:00M/4490
Record ID:1999071095
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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