. The Earth beneath the sea : History . 300 350 km INFERRED BASEMENT Fig. 29. Magnetic profiles across the Tonga Trench and their interpretation in terms of a magnetic basement. The bars are seismic depths and the dots are estimated depths based on the "half-width" of suitable magnetic anomalies. (After Raitt et al., 1955.) accounted for by any reasonable configuration of the basement. It could be caused by structural differences between opposite sides of the trench; it could also be explained by susceptibility changes within the basement rocks, or by their possessing a remanent magn
. The Earth beneath the sea : History . 300 350 km INFERRED BASEMENT Fig. 29. Magnetic profiles across the Tonga Trench and their interpretation in terms of a magnetic basement. The bars are seismic depths and the dots are estimated depths based on the "half-width" of suitable magnetic anomalies. (After Raitt et al., 1955.) accounted for by any reasonable configuration of the basement. It could be caused by structural differences between opposite sides of the trench; it could also be explained by susceptibility changes within the basement rocks, or by their possessing a remanent magnetization aligned in some direction other than that of the present field. References Abragam, A., 1961. The Principles oj Nuclear Magnetism. Clarendon Press, Oxford. Abragam, A., J. Combrisson and I. Solomon, 1957. Polarisation nuclcaire par effet Over- hauser dans les solutions d'ion paramagnetiques. Acad. Sci. Paris, 245, 157-160. Alldredge, L. R. and G. D. Van Voorhis, 1961. Depth to source of magnetic anomalies. J. Geophys. Fes., 66, 3793-3800. Andrew, E. R., 1956. Nuclear Magnetic Resonance. Cambridge Univ. Press. Bauer, L. A., W. J. Peters, J. A. Fleming, J. P. Ault and W. F. G. Swami, 1917. Ocean magnetic observations. Publ. Carnegie Inst. Wash., No. 175, Pt. 3. Bemmelen, W. van, 1899. Die Abweichimg der Magnetnadel ... bis zur Mitte XVIII Jahrhunderts. Observations Batavia Roy. Mag. Met. Obs., Suppl. to vol. 21, 109 pp. Birch, F., J. F. Schairer and H. C. Spicer (Eds.), 1942. Handbook of physical constants. Oeol. Soc. Amer. Spec. Paper 36, 296-297.
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