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Effect of a global plume distribution on Earth normal modes
Author(s) -
Logne Philippe,
Romanowicz Barbara
Publication year - 1990
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/gl017i010p01493
Subject(s) - hotspot (geology) , amplitude , plume , mantle (geology) , geology , geophysics , convection , mantle plume , mantle convection , spatial distribution , normal mode , physics , computational physics , mechanics , meteorology , seismology , optics , tectonics , remote sensing , subduction , lithosphere , quantum mechanics , vibration
We show that a global distribution of small scale heterogeneities in the lower mantle induces both frequency splitting and amplitude scatter of low angular order modes. These effects can be used in order to map the global distribution of small scale structures in the mantle, such as plumes. Two independent datasets, consisting respectively of lower mantle modes interaction coefficients and of observed amplitudes of core modes, can then be used to constrain the low angular degrees of the spatial distribution and the mean size of heterogeneities, allowing us to constrain the mantle structure at different scales. If these heterogeneities are assumed to be plumes associated with hotspot activity, the mean size of plumes obtained using the two datasets is then in good agreement with that obtained from geodetical or numerical convection studies.