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

• 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

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.