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Detailed Reference Information |
Vinnik, L.P., Farra, V. and Kind, R. (2004). Deep structure of the Afro-Arabian hotspot by S receiver functions. Geophysical Research Letters 31: doi: 10.1029/2004GL019574. issn: 0094-8276. |
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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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Abstract |
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Keywords
Seismology, Body wave propagation, Seismology, Lithosphere and upper mantle, Tectonophysics, Dynamics, convection currents and mantle plumes |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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