Abstract
The valuable data for mean sea-level, as well as mean sea-water temperature and barometric pressure at Nezugaseki and Kasiwazaki was kindly placed at my disposal by the Agency of Geographical Survey Institute, for which I wish to espress my hearty thanks. Dr. I. Tsubokawa and Mr. T. Hayashi of the Geographical Survey Institute have obtained the amount of the subsidence of the ground near Nezugaseki, which was about 120 mm on the occasion of the Niigata Earthquake from the tidal curves at Nezugaseki and at Kasiwasaki, assuming Kasiwazaki is unchanged. I have also calculated the amount of the corresponding ground movement by applying the same method as used in the case of detecting the amount of depression of the datum line on Standard Bench Mark at Miyakezaka in Tokyo by utilizing fluviographic records on the occasion of the Kwanto Great Earthquake, Sept. 1, 1923. In that particular case, I have detected the amount of depression, about 90 mm, which pretty well coincided with that of the result of Levelling Survey, 86 mm, obtained by the Land Survey Department. [1]
