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Original Articles

On the Nature of the 20°—Discontinuity in the Earth’s Mantle

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Pages 137-144 | Received 18 Mar 1957, Published online: 15 Dec 2016

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  • GUTENBERG, B., 1953: Wave velocities at depths between so and 600 kilometers. Ditto, 43, pp. 223–232.
  • GUTENBERG, B., 1954: Low-velocity layers in the earth's mantle. Bull. Geol. Soc. Amer., 65, pp. 337 —348.
  • JEFFREYS, H., 1939: The times of P. S and SKS, and the velocities of P and S. Mon. Not. Roy. Astr. Soc., Geophys. Suppl., 4, pp. 498-533.
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  • LEHMANN, I., 1953. P and S at distances smaller than 250. Trans. Amer. Geophys. Union, 34, pp.477-483.
  • NISHIMURA, E. and KISHIMOTO, Y., 1956,b: On the Local Structural Character of the Earth's Crust, Tel/us, 8, pp. 329–334.
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