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Dynamic topography and gravity anomalies for fluid layers whose viscosity varies exponentially with depth (1987)

Revenaugh, Justin ; Parsons, Barry

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Publication Date: 2019-07-12

Description: Adopting the formalism of Parsons and Daly (1983), analytical integral equations (Green's function integrals) are derived which relate gravity anomalies and dynamic boundary topography with temperature as a function of wavenumber for a fluid layer whose viscosity varies exponentially with depth. In the earth, such a viscosity profile may be found in the asthenosphere, where the large thermal gradient leads to exponential decrease of viscosity with depth, the effects of a pressure increase being small in comparison. It is shown that, when viscosity varies rapidly, topography kernels for both the surface and bottom boundaries (and hence the gravity kernel) are strongly affected at all wavelengths.

Keywords: GEOPHYSICS

Type: Geophysical Journal (ISSN 0016-8009); 90; 349-368

Format: text

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