1Hz--100Hz Vertical, Horizontal and 3 Components Geophones. CDJ Series Geophones, natural frequency from 1Hz to ... geophones, 1Hz, 2Hz, 2.5Hz or 3Hz, are widely used in deep seismic prospecting, earthquake monitoring, microseismometry in engineering, surface ... coal, metallurgy, national defense, engineering and etc.Well-used geophone (shear wave probe) can be used to receive seismic wave in drilling ...