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S U M M A R YT h e analysis shows that the spectra of geoid undulation (AN) and gravity anomaly (Ag) computed from t h e values implied by the OSU89B harmonic coefficients, degrees 4-100, Rapp & Pavlis (1990), do not fit the spectra of AN and Ag 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). T h e 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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