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Records from some 20 tide stations in the eastern Pacific Ocean, covering a stretch from 57°N latitude to 33°S latitude, which show the onset of the seismic sea wave of April 1, 1946, are analyzed. Travel‐time curves, computed from the formula V = , are shown to be in good agreement with the observed times of arrival of the seismic sea wave. The average ratio of initial rise to succeeding fall of the water is found to be one to three, which may account for the frequent mention of an initial recession by eyewitnesses. The first half period is derived as a measure of the period of the seismic sea wave which is found to average 15.6 minutes. The period for the nearer stations averages 15.0 minutes, while for the farther stations it averages 17.4 minutes.
C. K. Green (Thu,) studied this question.