High-Frequency Pn Phases Observed in the Pacific at Great Distances

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Science  15 Jul 1977:
Vol. 197, Issue 4300, pp. 257-259
DOI: 10.1126/science.197.4300.257


Earlier observations of a seismic waveguide in the northwestern Pacific with a velocity of 8.3 kilometers per second to distances of approximately 30° are complemented by suggestions of a possible waveguide with a velocity of 7.8 kilometers per second to distances well in excess of 30°.