体積ひずみ計および面積ひずみ計による地殻ひずみの観測について

Abstract

For the purpose of studying the forecast of earthquakes, the observation of crustaldeformation is being carried on by the super-invar-bar extensometers consisted of 6components at Ide observatory.The volume dilatation and the area dilatation may be calculated from the observationby 3 components extensometer which are set up in the direction along the rectangularco-ordinate axes.For this reason, new volume dilatation meter and area dilatation meter weredesigned.In this paper the general results observed by these instruments and the M2-con-stituent of the earth-tide obtained by use of harmonic analysis from the datum arediscussed.