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The Galapagos axial magnetic anomaly: Evidence for the Emperor Event within the Brunhes and for a two‐layer magnetic source
Author(s) -
Wilson Douglas S.,
Hey Richard N.
Publication year - 1981
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl008i010p01051
Subject(s) - magnetic anomaly , geology , anomaly (physics) , layer (electronics) , wavelength , geophysics , seismology , physics , condensed matter physics , optics , materials science , composite material
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.