1969 年 14 巻 4 号 p. 144-155
After the installation of the instruments: Water-tube Tiltmeter; Ishimoto silica clinograph; silica extensometer, at Inuyama Crustal Movement Observatory in 1966, the continuous observation of crustal deformation has been carried out. This report is the results of 14 months- observation. It was found that the maximum principal strain was 0.6×10-6 in extension and 0.5×10-6 in contruction; areal dilatation was -0.2- +0.6×10-6 and maximum shearing strain was 1.6×10-6. The changes in inclination was also found to be in the order of 1.8×10-6 rad. The direction of extension of the principal strain seems to be corresponding to the geologic structure in Inuyama district. The change in areal dilatation has a reciprocal to that of the maximum shearing strain . The noise accompaning precipitation is comparatively large compared with the secular change in crustal deformation. However, the foundamental clue to the removal of this noise effect on crustal deformation was obtained. The mechanism of this noise appearance is presumably understood by considering the geologic structure in this area.