CALIBRATION FUNCTIONS OF NEAR EARTHQUAKE MAGNITUDES (M_L) AND CORRECTION VALUES OF STATION

By analysing the different regional calibration functions, it is found that the calibration functions show mainly the local attenuatiou coefficient of seismic waves and do not extend to any research field of seismic activity.According to geological construction unites, the local calibration functions are set.The calibration functions should be considered first, before correc-ting station values, the correction values of station cannot replace function correction.Based on the comprehensive research of over 100 seismic station data the functron value varations for different site condition station are not obvious, generally, they are about±0.3.