This paper presents main classes and varieties of sensors developed on the basis of the single-layer flat-coil-oscillator (SFCO) technology. The results of registration of human activity (steps and jumps) by seismic sensors based on this technology are presented and discussed in this paper. We applied some algorithms for digital processing of "RAW" data coming from vibrational seismic SFCO sensors, which made it possible to detect and mark out human steps and jumps from the background of natural ground vibrations. The unprecedented sensitivity of these sensors has been demonstrated, which, under favorable conditions (low natural ground vibrations), enables step-by-step registration of human activity at distances up to 350-370 m from the sensor installation point in the ground. The advantages of three-dimensional (3D) SFCO seismic sensors, which allow detecting human activity even with unfavorable environmental parameters and filtering features of the soil due to their anisotropy, have been demonstrated. The possibility of detecting soil features with new SFCO sensors is also shown. Possible applications of vibration seismic SFCO sensors in other areas are also discussed.
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