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本多 亮*; 大久保 慎人*; 田中 俊行*; 柳澤 孝一
no journal, ,
The absolute gravity measurement by FG-5 has been operated in and around the Tono Research Institute of Earthquake Science (TRIES) since 2003. During this period, two types of ground water level change was observed. One is the water level decrease more than 70 m in 12 years, which along the drilling of the 500 m deep shafts of the Mizunami Underground Research Laboratory (MIU). The interspaces of these stations are 1 to 2 km. The coseismic gravity decrease in these stations were about 10 micro gals which suggest that the mass moved away from these three stations equivalently. Based on former researches of geology and hydraulic geology, which clarified the permeable and impermeable layers well, we reached the model as follows for the coseismic case.
本多 亮*; 柳澤 孝一; 大久保 慎人*; 田中 俊行*
no journal, ,
東濃地震科学研究所(TRIES)では2003年より継続的に研究所周辺3観測点での絶対重力測定を繰り返し行っており、2011年3月に発生した東北地方太平洋沖地震に伴う重力変化を捉えた。本報告ではまずTRIES/MIU周辺で観測された重力データについて、新たに地震後5年間の地殻変動(余効変動)の影響を考慮した。また、TRIES/MIU周辺の水位観測結果それぞれについて詳しく調べ、それぞれの井戸で観測された水位変化について変位量、変位ピークまでの時間、その後の回復の様子等について整理し傾向を調べた。