On the resolution of density within the Earth

Details On the resolution of density within the Earth On the resolution of density within the Earth

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..140..159m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 140, Issue 1-3, p. 159-167.

Physics

33

Free Oscillation, Biassing Effects, Inner-Core Boundary(Icb)

Scientific paper

Roughly 30 years have passed since the last publication of a linear resolution calculation of density inside the Earth. Since that time, the data set of free oscillation degnerate frequencies has been completely re-estimated taking into account the biassing effects of splitting and coupling due to 3D structure. This paper presents a new resolution analysis based on the new data and focuses on two particular issues: (1) the density jump at the inner-core boundary which is important in discussions of the maintenance of the geodynamo; and (2) a possible density excess in the lowermost mantle which might be indicative of a ``hot abyssal layer''. We find that the density jump at the inner-core boundary is 0.82+/-0.18Mgm-3 which is significantly larger than previously thought. We also find little support for an excess density in the lowermost mantle though an increase of 0.4% is possible.

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