Deep structure of the Afro-Arabian hotspot by S receiver functions

Details Deep structure of the Afro-Arabian hotspot by S receiver functions Deep structure of the Afro-Arabian hotspot by S receiver functions

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3111608v&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 11, CiteID L11608

Physics

19

Seismology: Body Wave Propagation, Seismology: Lithosphere And Upper Mantle, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes

Scientific paper

We investigated deep structure of the Afro-Arabian hotspot by using recordings from Geoscope seismograph station ATD. The records are processed with the S receiver function technique, which allows a detection of Sp converted phases from the upper mantle discontinuities. The seismic data reveal two unusual discontinuities. The discontinuity at a depth of 160 km beneath the Gulf of Aden corresponds to the onset of melting. If the water content in olivine is around 800 H/106Si, melting at this depth requires a temperature close to 1550°C, about 120°C higher than the average. Another remarkable discontinuity is found at a depth of 480 km, where S velocity drops with depth by about 0.2 km/s. This can be the head of another plume which is trapped in the mantle transition zone.

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