Abstract
An underground observation vault was established at Abuyama Seismological Observatory in 1971. The crustal deformation has been observed for about two years by silicatube extensometers, horizontal pendulum and water-tube tiltmeters installed at this vault. It is noted from this observation that the ground has extended in the EW direction and contracted in the NS direction. This direction of ground deformation is contrary to that inferred from the mechanism of earthquakes occurring in the vicinity of the observatory. The ground deformation observed may result from the direction of the strike of NS-N20°E around the vault.
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Schedule a callMore From: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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