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The effect of the Hawaiian plume on the magnetic daily variation
Author(s) -
Simpson Fiona,
Steveling Erich,
Leven Martin
Publication year - 2000
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 - 10.1029/1999gl008426
Subject(s) - plume , bathymetry , geology , geophysics , variation (astronomy) , oceanography , mantle (geology) , climatology , meteorology , geography , physics , astrophysics
Can electromagnetic techniques be employed to detect the presence of a plume below an ocean approximately 5 km deep? Recent magnetovariational data from the islands of Oahu and Hawaii provide compelling evidence that this question can be answered in the affirmative. A significant diminution of the vertical magnetic field is observed at Hawaii as compared with Oahu, which cannot arise from island/ocean bathymetry effects. The plume paradox is that the effect may not be explained by induction. This could imply distortion and current channelling due to mantle heterogeneities on a scale hitherto unconceded in global induction studies.