Abstract
Gutenberg and Richter1 commented in 1935 that diffracted S (the S wave diffracted around the Earth's core) was recorded more frequently than diffracted P, but they provided no observational data. To our knowledge, the only reference to observations of S beyond the shadow zone since that time was made by Lehmann2, who expressed doubt (on the score of amplitude) whether this or the corresponding P phase were really diffracted waves. Again, no details of arrival times were given. The scant attention paid to diffracted S may be attributed to the fact that it is not listed in the standard travel time tables and consequently is not reported in station bulletins. On the other hand, observations of diffracted P are common, because it appears on seismograms as the first arrival at distances beyond about 100°.
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References
Gutenberg, B., and Richter, C. F., Gerl. Beitr. Geophys., 45, 280 (1935).
Lehmann, I., Bull. Seism. Soc. Amer., 43, 291 (1953).
Duwalo, G., and Jacobs, J. A., Canad. J. Phys., 37, 109 (1956).
Lehmann, I., and Plett, G., Gerl. Beitr. Geophys., 31, 38 (1932).
Sacks, I. S., J. Geophys. Res., 72, 2589 (1967).
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Alexander, S. S., and Phinney, R. A., J. Geophys. Res., 71, 5943 (1966).
Phinney, R. A., and Alexander, S. S., J. Geophys. Res., 71, 5959 (1966).
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CLEARY, J., PORRA, K. & READ, L. Diffracted S. Nature 216, 905–906 (1967). https://doi.org/10.1038/216905a0
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DOI: https://doi.org/10.1038/216905a0
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