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Magnetic models that include the detailed shape of volcanic basement were constructed to study magnetic anomalies observed near the sea floor at the East Pacific rise crest. A uniform magnetization of 0.011 emu/cm a will account for some but not all of the small-scale anomalies occurring within the central anomaly. A magnetization distribution varying from 0.0048 emu/cm a to 0.0257 emu/cm a was used to model the observed pattern more exactly. The cause of this magnetization distribution is not determined uniquely, but it may result from intensity fluctuations of the paleomagnetic field and variations in petrology. 43,700 4-3,2OO 46,000 41,000 CENTRAL ANOMALY J SEA-SURFACE MAGNETICS O IO KM