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Now at Laboratoire de Geodynamlque sous-rnarlne, CEROV, Villefranche sur mer, France
Now at Sierra Geophysics Inc., Houston, Texas, U.S.A.
Now at GEOMAR, Christian Albrechts University, Kiel, Federal Republic of Germany
Now at Scripps Institution of Oceanography, La Jolla, California, U.S.A.
Now at Shell Oil Company, Bellaire Research Center, Houston, Texas, U.S.A.


We present a new tectonic fabric map of the Southern Ocean south of 45°S derived from Geosat altimeter profiles and published bathymetric charts and magnetic anomaly picks. The interpretation of the Geosat data is based on an analysis of the first derivative of the geoid profiles (i.e., vertical deflection profiles). To improve the accuracy and resolution of the vertical deflection profiles, 22 repeat cycles from the first year of the Geosat/Exact Repeat Mission (Geosat/ERM) were averaged. At wavelengths less than about 200 km, the vertical deflection is highly correlated with sea-floor topography and thus reveals major features in areas that were previously unsurveyed. The density of the Geosat data is greatest in the high latitudes where lineated bathymetric features such as fracture zones, spreading ridges, trenches, and rifted margins stand out. To construct the tectonic fabric chart, the Geosat data are analyzed in combination with available shipboard bathymetric data and magnetic anomaly identifications.

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