潮汐ひずみの観測に及ぼすCavity Effectについて
1980 年 26 巻 2 号 p. 113-123
詳細
1980 年 26 巻 2 号 p. 113-123
Four extensometers with laser interferometer systems were installed in the disused race tunnel at the Amagase Crustal Movement Observatory. Two of them (EL-1 and EL-V) are super-invar bar extensometers with laser interferometer systems consisting of simple laser sources, Michelson interferometers and photodetecting equipments with image-sensors. The remaining two components (L-1 and L-2) are laser extensometers with a frequency-stabilized laser source. EL-1 and L-1 are orientated along the axis of the tunnel and L-2 is orientated across the tunnel. EL-V is a vertical component. Using continuous data obtained from these extensometers for the period of 390-day, the distortion of tidal strain field due to the cavity effect has been investigated. There is a good agreement between the observed data and the cavity effect calculated with finite element techniques for the actual tunnel profile.
