Revision of the Primary Trigonometrical Survey in Tango Earthquake Districts

Abstract

Some results of the trigonometrical revision works carried out in Tango Districts after the recent destructive earthquake have already lieen published in this Bulletin, Vol. IV. Later, in 1928, a more extensive revision was carried out, comprising 18 primary and 7 suppdementary trigonometrical points which were all well preserved since the earlier survey in 1885-89. The comparison of the results of the two surveys gives the deformation of the triangulation net as shown in the Table and Figs