PRELIMINARY RESEARCH ON THE PRECURSORY DATA FROM 《EARTHQUAKE CASES IN CHINA》
Zhang Zhaocheng Zheng Dalin Luo Yongsheng Liu Jiyang Jia Qing(Center for Analysis and Prediction, SSB)
There are 927 items/times in total of precursory anomalies for 60 earthquakes in the book 《Earthquake Cases in China》. They are grouped into 11 kinds of observational means and 75 sorts of abnormal items respectively. This paper introduced the basic conditions for earthquake cases and precursors, presented quantity of anomalies the anomalous precentage of fixed observational items of earthquakes and different regions as well as the main results of statistics and analysis research carried out according to the observational means and anomalous items. Based on these research results above, authors here further summed up several basic comprehensive characteristics of earthquake precursors in the mainland of China: diversity and comprehensiveness of earthquake precursors; the protracted and periodic nature of the anomalous duration; extensive and heterogeneous distribution of precursors; a direct varied relation existing between the statistic amount of earthquake anomalies and magnitude; the high complexity of earthquake precursors. The paper pointed out its significance in theory and practice, made analytic comparison with the earthquake precursors of Japan, U. S. A. and the Soviet Union and proposed to promote the further research on the earthquake precursors in the mainland of China.