On 1913 Prof. F. Omori noticed a peculiar variation of the sea level recorded at different Japanese, Italian and Austrian Mareographic stations, and gave a concluding remark “......a horizontal pressure applied from the inner side against the Japan arc, which is thus still in the process of change or growth, the consequence being the frequent production of seismic disturbances of gigantic magnitude. Under these circumstances it is natural that the land of Japan should present phenomena of the land elevation and depression. It seems probable that much light may be thrown on the instability of our earthquake country by a careful investigation of the variation in hight of the sea-level. etc.” Ten years, have elapsed and the Great Sagami-Bay Earthquake took place in the vicinity of Misaki, where Prof. Omori has pointed out the greatest secular elevation of the sea-level. In this respect the author getting data from the Military Survey Department calculated the variation of the sea-level observed at 10 Mareographic Stations since 1900-1923 and tabulated in p. 145. Figures in the table represent the excess or deficit from the average water stand in millimeter. It is seen that at Kusimo_??_o the variation is greatest.
