Constraints on a plume in the mid-mantle beneath the Iceland region from seismic array data

Details Constraints on a plume in the mid-mantle beneath the Iceland region from seismic array data Constraints on a plume in the mid-mantle beneath the Iceland region from seismic array data

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.143..119p&link_type=abstract

Geophysical Journal International, Volume 143, Issue 1, pp. 119-128.

Astronomy and Astrophysics

Astronomy

2

Array, Iceland, Mantle, Plume, Seismology

Scientific paper

Teleseismic P waves passing through low-wave-speed bodies in the mantle are refracted, causing anomalies in their propagation directions that can be measured by seismometer arrays. Waves from earthquakes in the eastern Pacific and western North America arriving at the NORSAR array in Norway and at seismic stations in Scotland pass beneath the Iceland region at depths of ~1000-2000km. Waves arriving at NORSAR have anomalous arrival azimuths consistent with a low-wave-speed body at a depth of ~1500km beneath the Iceland-Faeroe ridge with a maximum diameter of ~250km and a maximum wave-speed contrast of ~1.5 per cent. This agrees well with whole-mantle tomography results, which image a low-wave-speed body at this location with a diameter of ~500km and a wave-speed anomaly of ~0.5 per cent, bearing in mind that whole-mantle tomography, because of its limited resolution, broadens and weakens small anomalies. The observations cannot resolve the location of the body, and the anomaly could be caused in whole or in part by larger bodies farther away, for example by a body imaged beneath Greenland by whole-mantle tomography.

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