FIELD: measurement technology. SUBSTANCE: signals of two horizontal and vertical channels of seismometer are filtered. Filtered signal of vertical channel is shifted in phase through n/2 to lead and additional signal of vertical channel is generated which signs are analyzed simultaneously with signs of filtered signals of horizontal channels at each time moment and compared with selected combination of signs taking into account direction of source relative to direction of axes. Linearly polarized signals are extracted. After this extracted signal of vertical channel is shifted in phase through n/2 to lag. Device includes three-component unit of initial information, former of controlling pulses, three keys, three filters and two phase inverters. EFFECT: enhanced authenticity of extraction of seismic signal of Rayleigh waves. 2 cl, 2 dwg
