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历史上和现今发生了许多破坏性大地震和众多中小地震。
There happen many destructive earthquakes and a lot of mid? Small earthquakes in history and now? Days.
较详细地讨论了确定中小地震破裂面方向和环境应力值方法的误差。
The errors of determining direction of fracture plane and environment stress of moderate and small earthquakes are analyzed in detail.
先发大震可以激发后继大震孕育区内发生一系列中小地震——前兆地震。
The preceding great earthquake can probably trigger a series of moderate and small earthquakes----the precursory earthquakes in the consequently great earthquake generating area.
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