Observation of Crustal Deformation at Inuyama (II)

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This paper is the progress report concerning with the continuous observation of crustal deformation at Inuyama. The records used for the analysis are of the extenso meter and water tube tiltmeter, the recording periods of which are 20 months and 34 months respectively. The crustal deformation at Inuyama was revealed by the present analytical results. The direction of the principal strain of extension was found to be from N 45°KE to N 80°KE and is nearly concordant with the strike of geologic structure. Further the direction of principal strain of contraction was estimated from N 10?KW to N 45°KW and is concordant with that of the dip of the geologic strata. Maximum shearing stress was obtained as 0.6×10-6 per year. Maximum dip was mentained at a constant rate of 0.8×10-6/year, the direction of which was downwards N 40°KW. The strain with short period was found to be different from the general crustal deformation and was infered to be caused by the change in the pressure of water filled in the pore in rocks beneath the ground. The southeastern upheaved region along the Neo valley earthquake fault generated by the Mino-Owari earthquake of 1891 shows a tendency to subside in recovery movement and the strain accumulation was inferred to be going on with the strain rate less than 1×10-6/year.
日本測地学会の論文