Abstract

Evidence, in the form of recognizable patterns of bathymetry and magnetic anomalies, is presented that small spreading-center jumps (tens of kilometres) occur. With the effect of jumps postulated on the basis of magnetic anomalies removed, striking correlations in the 5- to 50-km-wavelength bathymetry across the present Cocos-Nazca (Galapagos) spreading center are apparent. This suggests that the asymmetric accretion observed on these profiles results from discrete spreading-center jumps rather than from true asymmetric spreading.

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