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在自组织临界现象、几何相变等物理理论的基础上，开发研究了基于自组织临界现象的中期地震预报算法。提出并定义了自组织临界行为的结构强度，简称ＣＳＩ值。ＣＳＩ值是反映地震活动的一个综合指标，其变化较好地反映了地震活动演化进程。对多个震例的研究表明，大地震发生前结构强度ＣＳＩ值存在一个增大的过程，这和理论结果基本一致。利用演化图和时程曲线可以估计地震发生的时空范围
Based on the theory of self-organized criticality and geometric phase transition, a mid-term earthquake prediction algorithm based on self-organized criticality is developed. Proposed and defined the structural strength of self-organized criticality behavior, referred to as CSI value. The CSI value is a comprehensive index that reflects the seismic activity, and its change reflects the evolution of the seismic activity well. Studies on multiple earthquake cases show that there is an increasing process of structural strength CSI before the earthquake, which is basically consistent with the theoretical results. Using the evolutionary diagram and time history curve, the space-time range of earthquake occurrence can be estimated