Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1493l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Sept. 1990, p. 1493-1496.
Physics
5
Earth Core, Earth Mantle, Geodynamics, Plumes, Spatial Distribution, Temperature Distribution, Tomography
Scientific paper
It is shown that small scale heterogeneities, not resolved by tomographic lower mantle models, may contribute to the splitting and amplitude scatter of the core and mantle modes of the earth and produce deviation patterns of the frequencies similar to those observed. A simple model of mantle plumes is used to obtain temperature contrasts of the same order of magnitude with two types of data, comparable with those of numerical simulation of plumes. The two kinds of datasets, consisting respectively of lower mantle modes interaction coefficients and of observed amplitudes of core modes, may then be utilized to constrain the low angular degrees of the spatial distribution and the mean size of heterogeneities, permitting constraint of the mantle structure at different scales. Thus if these heterogeneities are assumed to be plumes associated with hotspot activity, the average size of plumes obtained by utilizing the two types of data are then in good agreement with that obtained from geodetical or numerical convection studies.
Lognonné Philippe
Romanowicz Barbara
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