1Hz--100Hz Vertical, Horizontal and 3 Components Geophones. CDJ Series Geophones, natural frequency from 1Hz to 100Hz, include vertical geophone, ... horizontal geophone, bi-component geophone, tri-component geophone and inner-well geophone.CDJ low-frequency geophones, 1Hz ... 4,10,15,28,30,40,60,80 or 100Hz, are widely used to seismic prospecting of petroleum ...