The characteristics of the contact resonance, which cause errors in measurement, depend on the type and condition of the ground surface. It was experimentally and theoretically confirmed that by introducing the modified dimensionless mass ratio for the investigations of the contact resonance, the influence of the soil were approximately eliminated, and so the characteristics of the vertical resonant frequencies and resonant amplitudes of the vibration pickup on soil could be only explained in termes of the mass ratio factor. The contact resonances depend only on the mass ratio which provides the relation between the mass and base area of the vibration pickup, and the resonant frequencies decrease and the resonant amplitudes increase with increasing mass ratio of the vibration pickup. Consequently, this paper indicated that the most suitable condition, which minimized the errors in measurement caused by the contact resonances, were provided in chart form for the base area and the weight of the vibration pickup.
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