Abstract
Maps of bandpass‐filtered geoid height anomalies deduced from Seasat altimetry data – which are referred to as “geoid roughness maps”– are contoured over the Indian Ocean both in the short (30–90 km) bandwith and in an intermediate one (90–230 km). Interpretation of these maps essentially provides a guide as to where further detailed studies should be conducted. The roughness maps can thus be used as a fast and efficient “scanner” for isostatic processes at the scale of an entire ocean. Additionally, roughness maps provide a qualitative appraisal of the emplacement mechanisms of intraplate features: this can for example be appreciated by comparing the interpretations of the maps with the results of admittance studies over such features.
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