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Initial results from the ICEMELT Experiment: Body-wave delay times and shear-wave splitting across Iceland

Initial results from the ICEMELT Experiment: Body-wave delay times and shear-wave splitting across Iceland


Titill: Initial results from the ICEMELT Experiment: Body-wave delay times and shear-wave splitting across Iceland
Höfundur: Bjarnason, Ingi Þorleifur   orcid.org/0000-0001-5716-7053
Wolfe, Cecily J.
Solomon, Sean C.
Guðmundsson, Gunnar
Útgáfa: 1996-03-01
Tungumál: Enska
Umfang: 459-462
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: Geophysical Research Letters;23(5)
ISSN: 0094-8276
1944-8007 (eISSN)
DOI: 10.1029/96GL00420
Efnisorð: Geophysics; Iceland Hotspot; Shear-wave Splitting; Low-velocity anomaly; Upper Mantle; Jarðfræði; Jarðeðlisfræði; Jarðskjálftar; Bylgjufræði; Mælingar
URI: https://hdl.handle.net/20.500.11815/496

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Tilvitnun:

Bjarnason, I. T., Wolfe, C. J., Solomon, S. C., & Gudmundson, G. (1996). Initial results from the ICEMELT Experiment: Body-wave delay times and shear-wave splitting across Iceland. Geophysical Research Letters, 23(5), 459-462. doi:10.1029/96GL00420

Útdráttur:

We present results from the first stage of the ICEMELT broadband seismometer experiment designed to determine upper mantle structure beneath Iceland, a hotspot located on the Mid-Atlantic Ridge. Relative delays of teleseismic body waves across Iceland are in excess of l s for P waves and as large as 3 s for S waves. The patterns of P and S wave delays suggest a low-velocity anomaly in the upper few hundred kilometers beneath central Iceland, consistent with the signature of mantle upwelling beneath a hotspot. Shear-wave splitting measurements of the fast polarization direction ϕ and the delay time δt between the fast and slow shear waves have been obtained at several network stations. Splitting times range from 0.7 to 1.7 s, and fast directions are generally between N20°W and N45°W. While splitting times of this magnitude must be primarily signatures of the anisotropy of the Icelandic upper mantle, the directions of fast polarization are inconsistent with simple models of horizontally diverging flow either in the plate spreading direction or radially from the center of the hotspot. A hypothesis consistent with splitting data obtained to date is that the dominant contribution to upper mantle anisotropy is from the large-scale mantle flow field of the North Atlantic.

Leyfi:

Copyright 1996 by the American Geophysical Union.

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