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Tentative conclusions previously drawn from an analysis of seismic readings of four 1954 hydrogen bomb explosions are re-examined in the light of source data subsequently released on these explosions. The released data show that the authors' earlier computed origin-times for the four explosions were correct within 00, 04, 07, and 01 sec respectively. The re-examination shows that the J.B. P tables. need a correction of ?22  10 sec for surface epicentres in the mid Pacific and recordings at continental stations. It is confirmed that any difference between the P travel-times from Bikini to Australia and Bikini to the United States is not much more than 1/2 sec. The authors' previous inferences on the velocities of air waves from the explosions remain undisturbed. The re-examination confirms the occurrence of diffracted PKP waves in front of the 142 caustic, and confirms that these diffracted waves arrive at times significantly earlier than PKIKP waves.

On the Seismological Aspects of the 1954 Hydrogen Bomb Explosions