Vibrational Characteristics of the Ground Investigated by Several Methods

Abstract

The vibrational characteristics of the ground were investgated through the observation of natural earthquakes and blasts and by means of an oscillator and seismographs being set on the ground surface and in the drift. Fourier components were obtained in the case of seismograms of natural earthquakes and blasts, and the amplitude-frequency relations for a constant vibrational force in the case of vibrational test by the oscillator. The ground structure was rather complicated, however, the amplitude and phase distributions at each measuring point (on the ground surface and in the dirft) coincide well with that of theoretical calculations in regards to the ground structure and the spectrum of the place.