Seismic observation of narrow plumes in the oceanic upper mantle

Details Seismic observation of narrow plumes in the oceanic upper mantle Seismic observation of narrow plumes in the oceanic upper mantle

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30f..67l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 6, pp. 67-1, CiteID 1334, DOI 10.1029/2002GL015411

Physics

Geophysics

16

Marine Geology And Geophysics: Plate Tectonics (8150, 8155, 8157, 8158), Seismology: Lithosphere And Upper Mantle, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes

Scientific paper

We have found seismic evidence for the existence of narrow (about 200 km diameter) and hot plumes in the upper mantle above the 410 km discontinuity. They are located mainly under ocean islands, not however, under the central parts of major continents. These results are obtained from comparing globally the observed travel time differences between Ps conversions and SS precursors from the discontinuity at 410 km depth, using published data and new observations from ocean island stations. Comparison of SS precursors and Ps conversions, however, leads also to indications of significantly fewer narrow plumes in the upper mantle transition zone between 410 and 660 km depth, than in the upper mantle above 410 km depth.

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