A Study of Generation Mechanism of Ajimame Landslide Predicted from Oscillatory Characteristics of Microtremors

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Though a generation of Ajimame landslide was limited in a small area in 1977, it's movement has increased and enlarged downward with times from the end of 1979. The location is covered by mud stone of the Tertiary distributed in the central part of Japan. Surrounding conditions of the landslide are investigated to prove the latest mass movement from the characteristics of microtremors observed three years ago. In deducing substructure from spectra, it may be reasonable to take into consideration low velocity layer in any depth. Dominant directivities of ground motion are determined from particle orbits depicted by combination of the horizontal and the vertical wave trains, which are divided into several bands of pass filter. Their distribution in such a frequency range as is responsible to superficial structure is well explained by comparing with a pattern of deformation for a system under compressional pre-stress. The direction of principal stress set up initialy is nearly in accord with that of the ground slope in and around the landslide area. The rectangular region supposed as a stress field shows to correspond to the main area of sliding movement.
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