FAULT SOIL GAS COLLECTING RATE EFFECT ON THE OBSERVATION OF RN AT PUYANG SEISMIC STATION

It is necessary to develop fault soil gas observation along with earthquake fluid observation in situation of water excessive explotitation.The article introduces the collecting-transmitting gas device of Rn-observation in soil gases at Puyang Station and analyzes the simulation data and the digitized data.The simulation data and the digitized data are quite different.The concept "collecting gas rate" is proposed for the first time to judge the practical effect of the fault soil gas observation system quantitatively.The simulation data and the digitized data have good relationship with "collecting gas rate".The observation indicates that oversized collecting gas chamber volume leads low "collecting gas rate" and low observation value, and then is not suit for earthquake precursor observation.So it is necessary to do experiment to determine the collecting gas rate in the practical work, and then design the collecting-transmitting gas device reasonably to improve the observation quality.