川西地震活动性标度研究

讨论了川西几次中强震前地震活动性标度值Ｈ的时空变化特征，认为强震前１－２年有高Ｈ值异常，Ｈ值的空间分布与地质构造，地震带、强震孕育过程等有关，我们用罗兰格等推导的公式对川西几次强震前区域地震活动性标度进行了研究，发现炉霍７．６级。松－平７．２级，盐源６．７级等地震前Ｈ值有由低转高增强再发震的特征，空间扫描结果发现１９７６年８月１６日松－平７．２级地震前地震活动性标度值Ｈ有成片增长的过程。

A STUDY OF THE SCALE OF SEISMIC ACTIVITY IN WESTERN SICHUAN PROVINCE

This paper discusses the time-space variational characteristics of scale value H of the seismic activity before several moderately strong earthpuades in western Sichuan province. It is considered thatthere are high H value anomalies 1 - 2 years before strong esrthpuades. The spatial distribution of H values are related with geological structures, seismic zones, preparation process of strong earthquakes etc.We have studied the scale of regional seismic activity before several strtong earthquakes in .westernSichuam province by the formula produced by Luo Lange et al,and found that the H values became highfrom low ones before Luhuo 7. 6, SOng-Ping 7. 2, Yanyuan 6. 7 earthquakes and then the earthquakesoccurred. It is found by spatial scan result,that the scale value H of seismic activity showed an extensiveincreasing process before the Song-Ping 7. 2 earthquake on August 16, 1976.