六甲高雄観測室における地殻変動と地下水の観測-1995年兵庫県南部地震に関連した変化

The Hyogo-Ken-Nanbu Earthquake (M= 7.2) occurred in and near Kobe city on January 17, 1995. Rokko-Takao station for monitor of crustal deformation lies in the hypocentral region of this earthquake.It was found by the geodetic measurements that strain rates and upheaval rate changed in 1991. Change of strain rate were observed by a borehole strainmeter in October 1994. Anomalous increase of discharged groundwater started in November 1994. These changes are considerd to be precursors of the earthquake. No anomalous change was detected just before the earthquake.