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On the resolution of density within the Earth
- Source :
-
Physics of the Earth & Planetary Interiors . Nov2003, Vol. 140 Issue 1-3, p159. 9p. - Publication Year :
- 2003
-
Abstract
- 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 <F>0.82±0.18</F> Mg m<F>−3</F> 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. [Copyright &y& Elsevier]
- Subjects :
- *EARTH'S core
*DENSITY
*OSCILLATIONS
*GEODYNAMICS
Subjects
Details
- Language :
- English
- ISSN :
- 00319201
- Volume :
- 140
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Physics of the Earth & Planetary Interiors
- Publication Type :
- Academic Journal
- Accession number :
- 11466548
- Full Text :
- https://doi.org/10.1016/j.pepi.2003.07.008