Seismic evidence for a tilted mantle plume and north–south mantle flow beneath Iceland

Shear waves converted from compressional waves at mantle discontinuities near 410- and 660-km depth recorded by two broadband seismic experiments in Iceland reveal that the center of an area of anomalously thin mantle transition zone lies at least 100 km south of the upper-mantle low-velocity anomal...

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Bibliographic Details
Published in:Earth and planetary science letters 2002-04, Vol.197 (3), p.261-272
Main Authors: Shen, Yang, Solomon, Sean C., Bjarnason, Ingi Th, Nolet, Guust, Morgan, W.Jason, Allen, Richard M., Vogfjörd, Kristin, Jakobsdóttir, Steinun, Stefánsson, Ragnar, Julian, B.R., Foulger, G.R.
Format: Article
Language:English
Subjects:
convection
discontinuities
Iceland
mantle plumes
transition zones
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Summary:Shear waves converted from compressional waves at mantle discontinuities near 410- and 660-km depth recorded by two broadband seismic experiments in Iceland reveal that the center of an area of anomalously thin mantle transition zone lies at least 100 km south of the upper-mantle low-velocity anomaly imaged tomographically beneath the hotspot. This offset is evidence for a tilted plume conduit in the upper mantle, the result of either northward flow of the Icelandic asthenosphere or southward flow of the upper part of the lower mantle in a no-net-rotation reference frame.
ISSN:0012-821X
1385-013X
DOI:10.1016/S0012-821X(02)00494-6