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地震发生日期的预报是人们很关心的地震预报三要素之一。早在1969年渤海湾大震时我国地震工作者就发现该震短临前兆的发育程度在时间上有起伏,1975年海城大震和1976年松潘大震的前兆也有类似情况。1977年本文作者和李海华、徐文耀根据大量资料的分析统计发现,前兆随时间的起伏虽然较复杂,但大致有倍九日期的规律,即前兆(包括测震学指标)多出现于震前若干小时内(相当于零九)、九天(一九)、十八天(二九)……等”。另外磁暴(K≥6)发生后的倍九日期地震也较多。1979年日本学者力武常次的统计
Forecasting the date of an earthquake is one of the three elements of earthquake prediction that people are most concerned about. As early as the 1969 Bohaiwan earthquake, Chinese seismologists found that the degree of development of the epicenter of the earthquake was fluctuant in time. The similarities were also observed in the precursors of the Haicheng earthquake in 1975 and the Songpan earthquake in 1976. In 1977, the authors and Li Haihua and Xu Wenyao, based on the analysis and statistics of a large amount of data, found that although the ups and downs of precursors over time are more complicated, they generally have the same rule of the times of nine times, that is, precursors (including seismological indicators) (Equivalent to zero nine), nine days (one nine), eighteen days (twenty-nine) ...... "and the other after the storm (K ≥ 6) after the nine times more earthquakes in 1979. Japanese scholar Li Wu often Statistics