Physics – Geophysics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ang....37...69m&link_type=abstract
(Association Internationale de Geodesie and COSPAR, Symposium International sur la Geodesie Spatiale et ses Applications, Cannes
Physics
Geophysics
1
Geodesy, Geodynamics, Geoids, Geophysics, Paleomagnetism, Earth Rotation, Geomagnetism, Gravitational Effects, Paleoclimatology, Planetary Evolution
Scientific paper
Space geodesy has recorded the irregular surface of the present geoid of the earth with great precision. The geoid surface is a function of the rotational potential, the internal gravity forces due to the mass distribution, and the external gravity forces which the earth is subjected to. Any change in any of those factors will lead to the deformation of the geoid. The geoid is found to be constantly changing. This is well documented in the sea level records during the Late Pleistocene and the Holocene. It seems also to be identifiable in short-period instrumental records. The stability of the present reference levels is questioned: they seem constantly to be deforming. The Late Pleistocene and Holocene paleogeoid changes are linked to major geomagnetic changes indicating a mutual origin. Gravitational vibrations or drop motions are recorded in the Cretaceous, in the Pliocene and, maybe, in the Holocene. This represents a novel factor in earth geodynamics. Correlations between paleogeodesy, paleomagnetism and paleoclimatology are the expression of a complex interaction of different geophysical variables. The study of the causation and deformation of the geoid irregularities is of fundamental importance in geophysics and paleogeophysics.
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