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. |