Marine Geophysical Researches

, Volume 7, Issue 3, pp 401–418

Near bottom magnetic profile across the Red Sea

  • Stephen P. Miller
  • Ken C. Macdonald
  • Peter F. Lonsdale
Article

Abstract

Results are presented from a high precision geophysical profile made at an altitude of about 100 m above the sea floor with the Deep Two instrument package, crossing the Red Sea at 17°30′N. The emphasis is on the analysis and interpretation of the magnetic field, including an inversion which removes the distortions due to bathymetry and the orientation with respect to the earth's main field vector. The spreading rates are determined precisely and found to be highly asymmetric: only 5 mm yr-1 to the east and up to 10 mm yr-1 to the west. We conclude that the axis of spreading is located on a volcanic ridge, rather than on the axial graben, based on the presence of a zone of high magnetization. The magnetization high (40 Am-1) is about twice as great as found on the Mid-Atlantic Ridge with the same instrument and analysis. The quality of the recording of the magnetic anomalies in the oceanic crust is much greater than expected for such a low spreading rate.

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Copyright information

© D. Reidel Publishing Company 1985

Authors and Affiliations

  • Stephen P. Miller
    • 1
  • Ken C. Macdonald
    • 1
  • Peter F. Lonsdale
    • 2
  1. 1.Department of Geological Sciences and Marine Science InstituteUniversity of CaliforniaSanta BarbaraU.S.A.
  2. 2.Marine Physical Laboratory, Scripps Institute of OceanographyUniversity of CaliforniaSan DiegoU.S.A.

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