abstract

A seismic refraction experiment was carried out 200 miles southeast of the Reykjanes Ridge and a normal oceanic crustal structure was observed. Analysis of 70 compressional-wave arrivals led to the conclusion that seismic anisotropy of the uppermost mantle may not exist here. A new model for the origin of anisotropy is proposed which predicts that the minimum velocity will always be found along a direction parallel to linear oceanic magnetic anomalies.

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