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Seismic evidence for a lower-mantle origin of the Iceland plume

Seismic evidence for a lower-mantle origin of the Iceland plume


Titill: Seismic evidence for a lower-mantle origin of the Iceland plume
Höfundur: Shen, Yang
Solomon, Sean C.
Bjarnason, Ingi Þorleifur   orcid.org/0000-0001-5716-7053
Wolfe, Cecily J.
Útgáfa: 1998-09
Tungumál: Enska
Umfang: 62-65
Háskóli/Stofnun: Háskóli Íslands
University of Iceland
Svið: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Deild: Raunvísindastofnun (HÍ)
Science Institute (UI)
Birtist í: Nature;395(6697)
ISSN: 0028-0836
1476-4687 (eISSN)
DOI: 10.1038/25714
Efnisorð: Jarðeðlisfræði; Jarðmöttull; Jarðskjálftar; Jarðskjálftamælingar; Ísland
URI: https://hdl.handle.net/20.500.11815/574

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Tilvitnun:

Shen, Y., Solomon, S. C., Bjarnason, I. T., & Wolfe, C. J. (1998). Seismic evidence for a lower-mantle origin of the Iceland plume. Nature, 395, 62. doi:10.1038/25714

Útdráttur:

Iceland, one of the most thoroughly investigated hotspots1,2,3, is generally accepted to be the manifestation of an upwelling mantle plume4. Yet whether the plume originates from the lower mantle or from a convective instability at a thermal boundary layer between the upper and lower mantle near 660 km depth5,6 remains unconstrained. Tomographic inversions of body-wave delay times show that low seismic velocities extend to at least 400 km depth beneath central Iceland7,8, but cannot resolve structure at greater depth. Here we report lateral variations in the depths of compressional-to-shear wave conversions at the two seismic discontinuities marking the top and bottom of the mantle transition zone beneath Iceland. We find that the transition zone is 20 km thinner than in the average Earth9 beneath central and southern Iceland, but is of normal thickness beneath surrounding areas, a result indicative of a hot and narrow plume originating from the lower mantle.

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