Outer core density heterogeneity and the discrepancy between PKP and PcP travel time observations

Details Outer core density heterogeneity and the discrepancy between PKP and PcP travel time observations Outer core density heterogeneity and the discrepancy between PKP and PcP travel time observations

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30d..39s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 4, pp. 39-1, CiteID 1190, DOI 10.1029/2002GL016647

Physics

6

Tectonophysics: Tomography, Tectonophysics: Earth'S Interior-Composition And State (1212), Tectonophysics: Core Processes (1507), Seismology: Core And Mantle

Scientific paper

We derive 3-D tomographic maps of the Earth's mantle, CMB and outer core, from seismic P, PcP, PKPbc, PKPdf travel time data, based on the bulletins of the International Seismological Centre (1964-1995), after source relocation by Antolik et al. [2001] and phase re-identification by Engdahl et al. [1998]. Maps of the CMB derived independently from core-reflected (PcP) or core-refracted (PKP) phases are not well correlated. We attempt to explain this discrepancy, and study the radial coherence of whole-Earth tomographic images, to identify possible trade-offs between CMB undulations and velocity anomalies in the mantle or outer core. Imaged velocity anomalies in the lowermost mantle are anticorrelated with the topography of the CMB; likewise, imaged lateral heterogeneities in the outer core are correlated with the topography of the CMB. This, together with the study of Piersanti et al. [2001], suggests that the core anomalies might not be entirely fictitious.

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