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Implications of regional gravity for state of stress in the earth's crust and upper mantle.

Journal of Geophysical Research

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Abstract

Topography is maintained by stress differences within the earth. Depending on the distribution of the stress we classify the support as either local or regional compensation. In general, the stresses implied in a regional compensation scheme are an order of magnitude larger than those corresponding to local isostasy. Gravity anomalies, a measure of the earth's departure from hydrostatic equilibrium, can be used to distinguish between the two compensation mechanisms and thus to estimate the magnitude of deviatoric stress in the crust and upper mantle. Topography created at an ocean ridge crest or in a major contiental orogenic zone appears to be locally compensated. Such features were formed on weak crust incapable of maintaining stress differences much greater than the stress from the applied load. Oceanic volcanoes formed on an already cooled, thickened lithosphere are regionally supported with elastic stresses. -Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Implications of regional gravity for state of stress in the earth's crust and upper mantle.
Series title:
Journal of Geophysical Research
Volume
85
Issue:
B11
Year Published:
1980
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geophysical Research
First page:
6377
Last page:
6396
Number of Pages:
20