title: High-frequency pn phases observed in the pacific at great distances.
abstract: Earlier observations of a seismic waveguide in the northwestern Pacific with a velocity of 8.3 kilometers per second to distances of approximately 30 degrees are complemented by suggestions of a possible waveguide with a velocity of 7.8 kilometers per second to distances well in excess of 30 degrees .
authors.forename: D A
authors.initials: DA
authors.lastname: Walker