CHARACTER OF FIELD AND SOURCE PRECURSOR FOR INFORMATION ENTROPY OF ALL SORTS OF PRECURSORY ANOMALIES OF EARTHQUAKES BEFORE TANGSHAN EARTHQUAKE(MS 7.8) IN 1976
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摘要: 利用"专家系统"的思想对每一地震前兆异常事件进行综合评估,以每一异常的最可能发展时间来计算发震概率,利用各类地震前兆异常群体信息熵研究了系统熵值与地震场、源兆的关系。分析了1976年唐山7.8缓地震前各类地震前兆异常的时空分布特征,然后以唐山为中心在空间上划分三个区:近区、中间区和远区,分别计算了三个区各类地震前兆异常信息熵的时间演化值,分析了震前这种信息熵的场、源兆特征:震中近区的信息熵值要比中间区及远区低得多。Abstract: In this paper, comprehensive judgment on each anomaly of precursory anomalies of earthquakes is made by ideas of the "expert system", and probability of earthquake occurrcnce is calculated by means of the most likely time of earthquake occurrence for cach anomaly. The relationship between system entropy and field and s0urce precussor of earthquake is analysed by means of infomation entropy for groups of all sorts of precursory anomalies of certhquakes. In this paper, distribution character of time and space of in formation entropy for groups of all sorts of precursory anomalies of carthquakes before Tangshan earthquake (Ms7.8) in 1976 is analysed. Then the large area centred at Tangshan is divided into three parts: the near, middle and far areas. The evolution values of time of in fomation entropy for groups of all sorts of precursory anomalies of earthquakes in the three areas are respectively calculated, and the character of field and source precussory for this inforation entropy before earthquake in analyzed the infomation cntropy in the near area around the earthquake center.is much lower than in the middle and far areas.
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