Abstract
RECENTLY there has been much interest in the geophysical implications of the satellite-determined gravity field, and one suggestion is that the low-degree gravity harmonics are associated with undulations at the core–mantle boundary1–4. Mathematical formulation5 does indicate that any mass anomalies at the core–mantle boundary would be observable in the Earth's external potential. Indirect evidence in favour of this hypothesis would come from a strong correlation between the gravity and geomagnetic fields, because variations in the latter are attributed to sources located in the outer core. Egyed3 pointed out a positive correlation between the satellite geoid6 and the geomagnetic secular variations7, but Coode and Runcorn8 showed that this correlation was negligible when an improved satellite geoid9 was used. Hide4 has proposed, however, that certain magnetohydrodynamical considerations may suggest low amplitude, long wavelength irregularities in the core–mantle interface.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Vogel, A., Gerlands Beitr. Geophys., 69, 150 (1960).
Vogel, A., Bull. Géodés., No. 88, 223 (1968).
Egyed, L., Nature, 203, 67 (1964).
Hide, R., Science, 157, 55 (1967).
Cook, A. H., in The Earth's Mantle (Academic Press, London and New York, 1967).
Izsak, I. G., Nature, 199, 137 (1963).
Vestine, E. H., Laporte, L., Lange, J., and Scott, W. E., Carnegie Inst. Wash. Publ., 578 (1959).
Coode, A. M., and Runcorn, S. K., Nature, 205, 891 (1965).
Izsak, I. G., J. Geophys. Res., 69, 2621 (1964).
Kozai, Y., Smith. Astrophys. Obs. Spec. Rep., 295 (1969).
Gaposchkin, E. M., Smith. Astrophys. Obs. Rep., 200 (1966).
Hurwitz, L., Knapp, D. G., Nelson, J. H., and Watson, D. E., J. Geophys. Res., 71, 2373 (1966).
Leaton, B. R., Malin, S. R. C., and Evans, H. J., J. Geomagn. Geoelet., 17, 187 (1965).
Anderle, R. J., in The Use of Artificial Satellites for Geodesy, 2 (publications of the National Technical University, Athens, Greece, 1967).
Khan, M. A., and Woollard, G. P., Hawaii Inst. Geophys. Rep., 68–1 (1968).
Mosetti, M., quoted by Scheffer, V., Geofis. Meteor., 15, 23 (1966).
Yamaguti, S., Bull. Earthquake Res. Inst., 46, 901 (1968).
Rikitake, T., Electromagnetism and the Earth's Interior (Elsevier, Amsterdam, 1966).
Press, F., J. Geophys. Res., 73, 5223 (1968).
Lee, W. H. K., and Macdonald, G. J. F., J. Geophys. Res., 68, 6481 (1963).
Scheffer, V., Geofis. Meteor., 15, 23 (1966).
Strange, W. E., and Khan, M. A., Trans. Amer. Geophys. Un., 46, 544 (1965).
Kaula, W. M., Space Sci. Rev., 7, 769 (1967).
Fujisawa, H., Bull. Earthquake Res. Inst., 46, 927 (1968).
Kanamori, H., Bull. Earthquake Res. Inst., Tokyo Univ., 45, 657 (1967).
Ringwood, A. E., in Advances in Earth Science (MIT Press, Cambridge, Mass., 1966).
Shimazu, Y., J. Earth Sci. Nagoya Univ., 2, 15 (1954).
Keller, G. V., in Handbook of Physical Constants, Memoir 97 (Geol. Soc. Amer., 1966).
Hamilton, R. M., J. Geophys. Res., 70, 5679 (1965).
Hide, R., and Roberts, P. H., in Physics and Chemistry of the Earth, 4, 27 (Pergamon, London, 1961).
Woollard, G. P., and Khan, M. A., Pacific Science, 24, 1 (1970).
Strange, W. E., Smith Astrophys. Obs. Spec. Rep., 200 (1966).
Runcorn, S. K., Geophys. J. Roy. Astron. Soc., 14, 375 (1967).
Moberly, R., and Khan, M. A., Nature, 223, 263 (1969).
McDonald, K. L., J. Geophys. Res., 60, 377 (1955).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
ASADULLAH KHAN, M., WOOLLARD, G. Geophysical Implications of the Interrelationship of the Geogravity and Geomagnetic Fields. Nature 226, 340–343 (1970). https://doi.org/10.1038/226340a0
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1038/226340a0
This article is cited by
-
Correlations between the Earth's Gravitational and Magnetic Fields
Nature Physical Science (1971)
-
Significance of the Correlation between Spherical Harmonic Fields
Nature Physical Science (1971)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.