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Walker 1981
Walker, D.A. (1981). High-frequency PN,SN velocities: some comparisons for the Western, Central, and South Pacific. Geophysical Research Letters 8: doi: 10.1029/GL008i003p00207. issn: 0094-8276.

High-frequency Pn,Sn velocities for earthquakes originating in the subduction zones of the Western Pacific suggest that the travel paths of these phases, recorded in the range of 12 ¿ to 30 ¿, may be significantly different from those of Pn,Sn phases recorded at distances less than 12 ¿ or greater than 30 ¿. This suggestion is supported by high-frequency Pn,Sn velocities for the intra-plate earthquakes in the Central and South Pacific.

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Geophysical Research Letters
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American Geophysical Union
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