On April 1, 1946, a sudden movement of the ocean bottom in the Aleutian deep started a train of sea waves which were picked up on tide gauges as far away as Australia and South America. Great damage was done to all of the north coasts of the Hawaiian Islands and the waves surged to heights as great as 55 feet in some places of convergence. Investigation of the five main Hawaiian islands showed relationships between high water marks and submarine topography. Also the height was greatly influenced by the existence of coral reefs and lagoons along the shore. Investigations in Hawaii have been compared with determinations by the Japanese in the 1933 tidal waves to devise a means of forecasting the relative danger of different situations from future tidal waves.

Personal experiences during the tidal wave are given along with accounts of other observers.

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