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The Galapagos axial magnetic anomaly: Evidence for the Emperor Event within the Brunhes and for a two‐layer magnetic source

1981; American Geophysical Union; Volume: 8; Issue: 10 Linguagem: Inglês

10.1029/gl008i010p01051

1944-8007

Douglas S. Wilson, R. N. Hey,

Ionosphere and magnetosphere dynamics

The axial (Brunhes) magnetic anomaly over the Galapagos spreading center shows consistent short‐wavelength anomalies that are not consistent with a uniformly magnetized layer. We interpret this anomaly to confirm the presence of the Emperor reversed event at 0.49 ± 0.05 mybp, with a duration about 0.01 m.y. Further, this anomaly is consistent with a two‐layer magnetic source, with the lower layer having very broad transition zones, offset away from the axis from those of the upper layer by about 10 km.