Pn Wave Velocities Beneath the Tanzania Craton and Adjacent Rifted Mobile Belts, East Africa

Details Pn Wave Velocities Beneath the Tanzania Craton and Adjacent Rifted Mobile Belts, East Africa Pn Wave Velocities Beneath the Tanzania Craton and Adjacent Rifted Mobile Belts, East Africa

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2365b&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 16, p. 2365-2368

Physics

13

Seismology: Body Wave Propagation, Seismology: Lithosphere And Upper Mantle, Tectonophysics, Tectonophysics: Dynamics Of Lithosphere And Mantle-General

Scientific paper

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.

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