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Correction to “Initial results from the ICEMELT Experiment: Body‐wave delay times and shear‐wave splitting across Iceland”
Author(s) -
Bjarnason Ingi Th.,
Wolfe Cecily J.,
Solomon Sean C.,
Gudmundson Gunnar
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl01045
Subject(s) - geology , shear wave splitting , hotspot (geology) , mantle (geology) , seismology , microseism , geophysics , geodesy , seismometer , upwelling , oceanography
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 1 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 (100‐350 km) 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.