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以非线性动力学理论为依据，用非线性动力学中分析时间序列的算法复杂性研究地震活动规律和构成地震活动复杂现象的动力学特征。提出了按震级计算的地震算法复杂性AC值和按发震时间计算的地震算法复杂性TAC值。选取1970年以来中国东部Ms≥6.0地震，西部Ms≥6．5的强震，对AC值和TAC值进行回顾性分析；利用1970～1980年大华北地区展望性空区识别结果，对AC值和TAC值进行展望性检验分析，并进行了稳定性和可靠性分析。所得结果表明，主震前算法复杂性表现为低值异常变化；表明主震前孕震区震源参数及地壳介质各种物理性质的变化，导致中小地震活动的时空分布出现明显的变化，从原来的无序、杂乱状态向某种有序状态转变。
Based on the theory of nonlinear dynamics, the law of seismic activity and the dynamic characteristics of the complicated seismic activity are studied by analyzing the complexity of time series algorithms in nonlinear dynamics. The AC complexity of seismic algorithm calculated by earthquake magnitude and the complexity of seismic algorithm TAC calculated by earthquake occurrence time are proposed. The strong earthquakes of Ms≥6.0 in the east of China and Ms≥6.5 in the west of China were selected for retrospective analysis of AC values and TAC values from 1970 to 1970. Based on the identification results of the empty areas in the North China from 1970 to 1980, And TAC value of the prospective test analysis, and stability and reliability analysis. The results show that the complexity of the algorithm before the main shock shows the variation of low anomaly; it indicates that the source parameters of the seismogenic zone before the main earthquake and the changes of various physical properties of the crustal medium lead to obvious changes in the spatial and temporal distribution of the medium- Disorderly, messy state to some kind of orderly state change.