A comparison of the model (top) with the observations (bottom)


Both model and observations are restricted to the spectral range 15-40 and are displayed at an altitude 400 km. Sea floor spreading isochrons are shown as solid black. Lines in the Atlantic and the mid-Atlantic ridge is shown as a thick black line. K identifies anomalies due to the Cretaceous Quiet Zone. R identifies anomalies due to the  ridge axis, W  identifies Walvis ridge anomaly(Purucker and Dyment, 2000).

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