… Due to the lack of stability and high attenuation of the signal in our initial experiments, a
variable amplifier, commonly known as automatic gain control (AGC) circuit, was added after the …

… The amplitude of the motion of soil particles (particle velocity, mm/s) has been measured
on surface from their equilibrium position with respect to radial distances from the …

… The attenuated amplitude of the signal in case Figure 3D … Due to slightly lower density and
speed of sound in the soil’s … -wavelength sound wave to detect the comparable size of soil void…

… variability in signal propagation and attenuation properties of observed arrivals due to …
The shear wave velocity, vs, is typically used as a measure of the soil structure or fabric and …

… velocity (UPV) measurements are less commonly used. Table 1 shows the relevant methods
used for the measurement and prediction of the strength of soil… attenuation in stabilized soils…

… The attenuation … wave attenuation characteristics of different soils using DAS. A circular
experimental pit with a diameter of 1 m was designed to measure the responses of various soils. …

… quality of the lime/cement columns of the reinforced soil by the interpretation of signals. The
… during soil hardening. The quality of soil was evaluated by seismic measurements with aim …

… This is probably due to the high attenuation of the high frequencies within the soil, resulting
… used to calculate the spectrograms such as window size, overlap between the windows, and …

… the wave speed and hence the real part of the measured … attenuation in the clay soil, is
because the wave speed in the pipe is much smaller than the dilatational wave speed in the soil, …

… acoustic velocity is related to soil texture (paddy soil > red soil > lateritic-red soil). When the
… The measured soil viscosity is low, so scattering attenuation is the main reason for acoustic …