Abstract
Marine Geophysics![Figure][1] CREDIT: SANDWELL ET AL. Detailed topographic maps are available for only a small fraction of the ocean floor, severely limited by the number of ship crossings. Global maps constructed using satellite-derived gravity data, in contrast, are limited in the size of features they can resolve. Sandwell et al. present a new marine gravity model that greatly improves this resolution (see the Perspective by Hwang and Chang). They identify several previously unknown tectonic features, including extinct spreading ridges in the Gulf of Mexico and numerous uncharted seamounts. Science , this issue p. [65][2]; see also p. [32][3] [1]: pending:yes [2]: /lookup/doi/10.1126/science.1258213 [3]: /lookup/doi/10.1126/science.1260459
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