Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Geophysical journal international
5 (1943), S. 0
ISSN:
1365-246X
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geosciences
Notes:
The stress-differences needed to support given surface loads due to harmonics of degrees 2 and 3 have been estimated on four hypotheses: (1) elastic loading of a uniform sphere; (2) inelastic loading of a uniform sphere, with continuous stress at the centre; (3) and (4) inelastic loading of a sphere with no stress-differences within distances 0-545a and 0.9a of the centre, a being the radius. Mean stress-differences are also found on hypotheses (3) and (4) for loading due to harmonics of degrees 10 and 30. Combining the results with the observed distribution of gravity, it is found that the strengths needed on hypothesis (3) are about 150 × 106 dynes/cm.2 at depths down to about 0.1 of the radius and about 80 × 106 dynes/cm.2 down to the core. On hypothesis (2) strengths of about 330 × 106 dynes/cm.2 are needed throughout the outer tenth of the radius.The uncertainty of the coefficient of P2 in gravity found from the precessional constant by de Sitter's method is estimated from the variation of gravity in other harmonics not consistent with the hydrostatic state. It is found to be 5.9 mgal, virtually based on four degrees of freedom.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-246X.1943.tb00344.x
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