In this paper is given a theoretical investigation of a disturbance which may occur on the surface of the sea as the effect of an elevation or a depression of the bottom. The water is thought to be compressible and the sea floor is assumed to be consisted of a rigid substance. It is shown that the sea surface oscillates up and down as the result of waves of expansion occuring in the water by the dislocation of the bottom. The period of oscillation depends upon the depth of the water and is of the same order as, that of usual swell.

: From

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From the recent several tsunamis in the Pacific Ocean, we can derive the re-

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