Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.214..153l&link_type=abstract
Earth and Planetary Science Letters, Volume 214, Issue 1-2, p. 153-165.
Physics
8
Iceland, Azimuthal Anisotropy, Phase Velocity, Rayleigh Wave, Tomography
Scientific paper
We have determined the pattern of azimuthal anisotropy beneath Iceland from shear-wave splitting and Rayleigh wave tomography using seismic data recorded during the ICEMELT and HOTSPOT experiments. The fast directions of shear-wave splitting are roughly N-S in western Iceland and NNW-SSE in eastern Iceland. In western Iceland azimuthal variations in Rayleigh wave phase velocity show that fast directions are close to the plate spreading direction at short periods of 25-40 s and roughly parallel to the Mid-Atlantic Ridge at longer periods of 50-67 s. Beneath the rift zones in central Iceland, we find a ridge-parallel fast direction at periods of 25-40 s and significantly weaker azimuthal anisotropy at periods of 50-67 s. The 2-D variation of isotropic phase velocity at periods of 33-67 s indicates that the lowest velocities are beneath the rift zones in central Iceland rather than above the plume conduit in southeast Iceland. While ridge-parallel alignment of melt films might contribute to anisotropy above 50 km depth beneath the rift zones, the overall observations are consistent with a model in which plume-influenced, hot, buoyant mantle rises beneath the Mid-Atlantic Ridge at depths greater than 50 km and is preferentially channeled along the ridge axis at the base of the lithosphere beneath Iceland. The shear-wave splitting results are attributed primarily to a N-S mantle flow at depths greater than 100 km.
Detrick Robert S.
Li Aibing
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