Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 142, Issue 2, Pages 615-619Publisher
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-246x.2000.00179.x
Keywords
Afar; discontinuities; hotspot; receiver functions; transition zone; upper mantle
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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 660 km discontinuities beneath Afar. A transition zone thickness of 244 +/- 19 km 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 19 km uncertainty in the thickness estimate, a small thermal anomaly of similar to 100-150 K at mantle transition zone depths cannot be ruled out.
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