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从灾害的共性出发．探讨分析了灾害演化的规律。灾害演化具有准周期性.连锁性.叠加性.放大性，空间迁移性等特征。
Starting from the commonality of disasters. Explore and analyze the law of disaster evolution. Disaster evolvement is quasi - periodicity, chaininess, superposition, magnification and spatial mobility.