火球最初的迅速膨胀剧烈地压缩着周围的大气，产生了威力巨大的冲击波。
The initial rapid expansion of the fireball severely compresses the surrounding atmosphere, producing a powerful blast wave.
根据激波理论，爆炸产生压力脉冲并以压力波的形式传播，既有压缩波也有膨胀波。
According to the shock theory, the ejecta produced by explosion form the pressure pulse, and it spreads in forms of either compression waves or expansion waves.
压缩波的合并产生激波，它的强度被随后并入的压缩波或膨胀波分别增强或减弱。
Shocks are formed by merge of compression waves with each other and its magnitude is enhanced or declined by catching compression waves or expansion waves behind the shock respectively.
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