Results of Resurvey in the Southern Part of Hokkaido after the Great Earthquake of "Tokachi-oki"

Abstract

The first-order levelling and triangulation were performed from 1952 to 1955 in the Sourthern Part of Hokkaido after the great earthquake of "Tokachi-oki", Mar. 1952. As the old survey was carried out about fifty years ago, the difference between new and old surveys not only represents the deformation accompanying the earthquake, but also comprises the secular variation of the land. Vertical displacements of the crust is perspicuous in the Fig. 2. It seems that in Hokkaido the land is inclined to the south-east on the whole. The Fig. 6 shows that the horizontal displacements of the triangulation stations are small.