A spectral analysis of geoid undulation and gravity anomaly data computed with Pratt's isostasy theory applied to Moho depth variations in Fennoscandia

The analysis shows that the spectra of geoid undulation (Δ N ) and gravity anomaly (Δ g ) computed from the values implied by the OSU89B harmonic coefficients, degrees 4–100, Rapp & Pavlis (1990), do not fit the spectra of Δ N and Δg computed from values implied by a Pratt-type isostatic model a...

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Bibliographic Details
Published in:Geophysical Journal International
Main Authors: Nord, Tomas, Sjöberg, Lars E.
Format: Text
Language:English
Published: Oxford University Press 1992
Subjects:
Research Note
Pratt
Fennoscandia
Online Access:http://gji.oxfordjournals.org/cgi/content/short/111/1/179
https://doi.org/10.1111/j.1365-246X.1992.tb00564.x
Description
Summary:The analysis shows that the spectra of geoid undulation (Δ N ) and gravity anomaly (Δ g ) computed from the values implied by the OSU89B harmonic coefficients, degrees 4–100, Rapp & Pavlis (1990), do not fit the spectra of Δ N and Δg computed from values implied by a Pratt-type isostatic model applied to the Moho depth variations in Fennoscandia as suggested by Anderson (1984) and Marquart (1989). The magnitudes of the model spectra are that much larger than the OSU89B spectra that the relevance of the isostasy model is questionable.

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