两种震级标度讨论  

DISCUSSION ON TWO MAGNITUDE SCALES

作　　者：迟振才[1] 迟天峰[1] 

机构地区：[1]吉林省地震局,吉林长春130022

出　　处：《东北地震研究》2000年第4期9-15,共7页Seismological Research of Northeast China

摘　　要：分析论述了我国在测报近震震级和面波震级业务中存在的种种问题，用现行起算函数测算的ML随震中距存在系统偏差，近场偏低，远场偏高；此函数系统建立的方法有不合理之处，它不适于DD-1仪。用现行公式测算的MS与国际上震级水平不一致，总体趋势偏高；在90(距离上震级零点严重失控；用单一水平向记录计算MS是个原则性差误。需要用新的起算函数系统代替R1(()计算ML; 需要用新的公式取代现行公式计算MS。The main problems of two magnitude scales are emphasized in this paper. Many questions in the work of determined ML and Ms are analysed and discussed. The local earthquake magnitude calculated by the calibration function system currently in effect shows a systematic deviation along with the epicenter distances. This function system is not suitable for the seismograph instrument of DD1.A large amount of data indicate that the surface-wave magnitude values determined by the Beijing formula tend to be higher than those reported by the main international seismological organizations . This formula is zero magnitude out of control on the distance 90(. It is a fundamental conception wrong that MS is calculated by the single horizontal component record. In view of the above-mentioned facts, it is necessary to establish a new calibration function system to determine ML and a new formula to determine MS.

关 键 词：近震震级 面波震级 起算函数 震级水平 零点控制 

分 类 号：P315.32[天文地球—地震学]