The lithospheric geomagnetic field: origin and dynamics of long wavelength anomalies

Details The lithospheric geomagnetic field: origin and dynamics of long wavelength anomalies The lithospheric geomagnetic field: origin and dynamics of long wavelength anomalies

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...44..366m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 44, Issue 4, p. 366-372.

Physics

2

Scientific paper

The lithospheric part of the Earth's geomagnetic field seems to continue down through the lower spherical harmonics. The magnetisation in the lower crust to lower lithosphere is `temporarily locked'. Various geodynamic processes lead to locking or unlocking of this magnetisation. The crustal base is a phase boundary between strongly magnetised/less dense and weakly magnetised/denser mass. Changes in pressure (and temperature) will dislocate this boundary and lead to changes in magnetisation and gravitational potential. The Fennoscandian uplift seems to record such phase boundary dislocation. Rotational changes may also affect this boundary. Changes in the lithospheric magnetic field have become highly relevant in studies of the dynamics and time consistency of lithospheric processes and properties.

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