著者

志知 竜一 飯田 汲事 山内 常生

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.48, no.6, pp.1241-1249, 1970-11

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A remarkable strain step was recorded by the strainmeter at the Inuyama Crustral Movement Observatory which is located at a distance of about 48km from the epicenter of the Gifu earthquake of September 9, 1989, with the magnitude of 6.6. At the same time a rapid increase of discharged water in the observational gallery was also observed. These phenomena were also observed at the time of the off Nemuro (Hokkaido) earthquake of August 12, 1969, with the magnitude of 7.8. In the case of the off Nemuro earthquake the epicentral distance was about 1200 km. These strain steps and the abnormal increase of discharged water at the time of earthquakes were taken into consideration for the analysis of the crustal deformation accompanied by earthquakes and principal strains obtained from the calculations are listed in Tables 1 and 2, respectively.