【摘要】 本文探讨了从初动符号资料中提取前兆信息及其在地震预报中的意义。经研究表明:1976年唐山强震前后,矛盾符号比呈现“高—低—发震—高”的变化趋势。从晋冀蒙交界地区逐年的平均节面解中得到 P 轴、B 轴及解的其他参数随时间的变化在1973年或1974年都有不同程度的异常反映,这在地震预报中是有用的线索。更多还原

【Abstract】 This paper approaches the extracting precursory information from the data on the first motion polarity of small earthquakes and its significance in earthquake prediction. It is shown that the propotion of inconsistent readings exhibits the varying trend of “high-low-earthquake-high”before and after the 1976 Tangshan earthquake.The year by year time-dependent parameters of P-axis,B-axis,etc.obtained from the average nodal plane solution for the juncture area of Shanxi,Hebei,Inner Mongolia,China all behaved abnormally to different degrees in 1973 or 1974.This may be a useful due to earthquake prediction.更多还原