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Rayleigh-wave evidence for the low-velocity zone in the mantle

Takeuchi, H. and Press, F. and Kobayashi, N. (1959) Rayleigh-wave evidence for the low-velocity zone in the mantle. Bulletin of the Seismological Society of America, 49 (4). pp. 355-364. ISSN 0037-1106.

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Variational calculus methods are applied to the problem of dispersion of mantle Rayleigh waves. In the present paper we have worked two models. One is Gutenberg's model with a low-velocity layer around 150 km. depth. The other is a Jeffreys-Bullen model modified above 200 km. depth so as to join smoothly to the explosion-determined velocities just under the Mohorovičić discontinuity. No low-velocity layer is assumed in this model. Both models give almost identical theoretical dispersion curves which agree well with the Ewing-Press observations of mantle Rayleigh waves for periods longer than 250 sec. This result means that the minimum group velocity at about 250 sec. is mainly due to a sharp increase of shear velocity at about 400 km. depth, which is a common feature for the two models. For periods shorter than 250 sec. Gutenberg's model gives results concordant with the observations. The modified Jeffreys-Bullen model disagrees significantly with the observations. This demonstrates the existence of a low-velocity layer in the upper mantle.

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Additional Information:Copyright © 1959, by the Seismological Society of America. Manuscript received for publication February 17, 1959. The authors thank Dr. Gutenberg for his helpful suggestions in the course of this study, Dr. N. Jobert for her discussions by mail, and the Alfred P. Sloan Foundation for financial support.
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Alfred P. Sloan FoundationUNSPECIFIED
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Caltech Division of Geological Sciences922
Issue or Number:4
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48118
Deposited By: George Porter
Deposited On:06 Aug 2014 21:56
Last Modified:03 Oct 2019 07:00

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