チリ地震津波による土地の傾斜及び伸縮変化

Abstract

The peculiar oscillatory tiltings and strains of the Earth's surface due to thechanges of the load of sea water in case of the Chile Tsunami on May 24, 1960 wereclearly observed with the tiltmeters and extensometers at five observatories situatedwithin 30 km distance from the nearest sea coast.The complex mechanism of these ground tilts and strains was well explained fromthe stand-point of Boussinesq's theory.Attempt was therefore done to obtain separately the values of .~ and p of theupper crust by the method of combination of "tilt and strain equations" based onBoussinesq's solution. The results are shown in Table 4.Next, assuming the distribution of the load of Tsunami, the values of 5x10" c.g.s.As the effective rigidity for the crust was obtained by the comparison of the observedvalue with the theoretically expected one.