Seismic instruments: article

Аnnotation: A new short-period borehole seismometer TBSC6 designed and produced at VNIIA provides proportional transformation of vertical seismic oscillation velocity to electrical signal. The seismometer has been designed for installation in boreholes of 145–220 mm inner diameter and inclination up to 3.5°. By its technical features (frequency range 0.5–100 Hz, linearity less than 0.006 %, noise level less then –10 dB of low seismic noise model, dynamic range more than 145 dB, temperature range –25…50 °C) the seismometer corresponds with the best short-period borehole seismometers in the world. The features achieved give ability to use the short-period borehole seismometer for seismological observations of both far and local seismic sources and also for seismic situation monitoring in vicinity of hydro technical constructions, atomic power stations and so on. Auxiliary equipment (locking device, installation complex set with the borehole ahead) provides the seismometer installation into boreholes of inner diameter 145–220 mm at depth down to 100 m. Borehole ahead saves borehole tube with outer diameter 150–250 mm.