Mantle transition zone thickness beneath Afar: implications for the origin of the Afar hotspot

Details Mantle transition zone thickness beneath Afar: implications for the origin of the Afar hotspot Mantle transition zone thickness beneath Afar: implications for the origin of the Afar hotspot

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.142..615n&link_type=abstract

Geophysical Journal International, Volume 142, Issue 2, pp. 615-619.

Astronomy and Astrophysics

Astronomy

12

Afar, Discontinuities, Hotspot, Receiver Functions, Transition Zone, Upper Mantle

Scientific paper

The velocity spectrum stacking method is applied to receiver functions from stations ATD and AAE to image P-to-S converted phases originating at the 410 and 660km discontinuities beneath Afar. A transition zone thickness of 244+/-19km is obtained, similar to the global average transition zone thickness. This result suggests that any broad thermal anomaly beneath Afar probably does not extend as far down as the transition zone. However, because of the 19km uncertainty in the thickness estimate, a small thermal anomaly of ~100-150K at mantle transition zone depths cannot be ruled out.

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