天ケ瀬地殻変動観測所における地殻変動観測(第2報)

Abstract

At the Amagase Crustal Deformation Observatory, for the purpose of investigating the relationsbetween crustal deformations and earthquake occurrence and finding out some clues for earthquakeprediction, since Apr., 1967, the continuous observations of ground-strain and ground-tilt arebeing carried out by the super-invar-bar extensometers, the super-invar-wier extensometer, thetiltmeters of horizontal pendulum type and the watertube tiltmeters. The instruments have beengradually increasing in number year after year and at present, the earthquake observations are beingearned out by the short period seismographs, the long period seismographs and the strain seismo-graph, in addition to the observations of ground-strain and ground-tilt.In this paper, the results of some observations on crustal deformation and earthquakes occurringin the virinity of the Amagase Observatory are reported and discussed them.