... vertical, horizontal, 3C geophone. CDJ middle & high frequency geophones, 4,10,15,28,30,40,60,80 or 100Hz, are widely ... /HorizontalVerti/HoriVerti/HoriVerti/HoriVerti/HoriNature Frequency Fn (Hz)4±10%4.5±10%10±5%15±5%28±5%Sensitivity G (v/cm ... %310±5%415±5%Damp Bt0.7±10%0.7±10%0.58±10%0.58±10%0.62±10%Harmonic Distortion D (%)≤0.2Insulation Resistance R ...