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引言 古登堡和李克特在研究美国加利福尼亚和全球的地震活动性时,发现在一定的震级区间内地震的频度N和震级M之间服从对数线性关系 logN=a-bM,(1) 即著名的古登堡-李克特关系式。 近40年来,世界各国的地震学家对关系式(1)进行了大量详细的研究。研究强震孕育过程中b值的时空变化开始得较晚。李全林等对京、津、唐、渤、张地区从1966年4月1日到1976年7月27日十年多的地震资料进行了b值时空扫描。结果表明,1976年
Introduction Gutenberg and Likert studied the earthquakes in California and the United States and found that the logarithm of linear relationship logN = a-bM (1 ) Is the famous Gutenberg-Likert relation. In the past 40 years, seismologists in various countries of the world have done a lot of detailed studies on the relation (1). The spatial and temporal changes of b value in the study of strong earthquakes began relatively late. Li Quanlin and other seismic data of Beijing, Tianjin, Tang, Bo, Zhang area from April 1, 1966 to July 27, 1976 more than a decade of b-value space-time scanning. The results show that in 1976