Lg MAGNITUDE DETERMINATION FOR THE EASTERN SIX PROVINCES OF CHINA (PART I)--DETERMINALTION METHOD AND RESULTS

The method which defines the magnitude formulas for single station and seismograph network, the standard deviation and station correction of the magnitudes is systematically explained.According to about 1 Hz Lg attenuation coefficient determined in the region including six eastern provinces of China, the Lg magnitude formulas for this region are deduced as follows: mLg(z,h)=lgdLg(z,h)+5/6lg+0.0019+2.09 mmx(z,h)=lgdmx(x,h)+lg+0.0013+1.27 MLgz,MLgh,Mmxz and Mmxh of 19 events in the region, an 80 station correction values are calculated accurately. The standard deviation of single station magnitude is 0.15-0.16 magnitude unit, and that of seismograph network is 0.03-0.04 unit.In addition, Mmxz and Mmxh of 111 events are determined. Some relations and results deduced by 19 events are verified or completed.