Pn wave velocities beneath the Tanzania Craton and adjacent rifted mobile belts, East Africa

R. A. Brazier, A. A. Nyblade, C. A. Langston, T. J. Owens

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22 Scopus citations

Abstract

P wave travel times from regional earthquakes recorded by the Tanzania Broadband Seismic Experiment have been inverted for long wavelength (>100 km) Pn velocity variations beneath Tanzania using a generalized inverse algorithm. Pn velocities, on average, are 8.40 to 8.45 km/s beneath the center of the Tanzania Craton, 8.30-8.35 km/s beneath the terminus of the Eastern Branch of the rift system, and 8.35-8.40 km/s beneath the Western Branch. These velocities indicate that there are no broad (>100 km wide) thermal anomalies in the uppermost mantle beneath areas of rifting in Tanzania, and suggest that thermal anomalies present deeper in the mantle have not yet reached the base of the crust.

Original languageEnglish (US)
Pages (from-to)2365-2368
Number of pages4
JournalGeophysical Research Letters
Volume27
Issue number16
DOIs
StatePublished - Aug 15 2000

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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