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Structure and Composition of the Mantle

Anderson, Don L. (1971) Structure and Composition of the Mantle. Eos, 52 (5). pp. 174-175. ISSN 0096-3941. doi:10.1029/EO052i005pIU174.

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The last four years have been a period of increased emphasis on the problems of discontinuities, lateral variations, and shear velocities in the mantle. The presence of discontinuities near 400 km and 600 km has been verified by travel time, apparent velocity, and reflection and amplitude studies; it has been shown by refraction and reflection amplitudes that these discontinuities are extremely sharp, 4 km or less. Other discontinuities, or abrupt changes in velocity gradient, have been found in the upper and lower mantle. It now appears that there are relatively few large radial stretches of the mantle that are truly homogeneous. A summary of the locations of discontinuities in the mantle is given in Johnson [1967] and Whitcomb and Anderson [1970]. A second-order discontinuity has been found near 500 km by Helmberger and Wiggins [1971].

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Additional Information:© 1971 American Geophysical Union. This paper is Contribution 1963 of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena.
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Caltech Division of Geological and Planetary Sciences1963
Issue or Number:5
Record Number:CaltechAUTHORS:20151106-112402925
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Official Citation:Anderson, D. L. (1971), Structure and composition of the mantle, Eos Trans. AGU, 52(5), IUGG 174–IUGG 175, doi:10.1029/EO052i005pIU174.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61945
Deposited By: Ruth Sustaita
Deposited On:06 Nov 2015 19:30
Last Modified:10 Nov 2021 22:55

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