Moreover, most aftershocks of strong earthquake are small and moderate events, which provide important information on focal mechanism of mainshock.

此外，强震的余震多为中小地震，大量中小余震可为主震发震机理研究提供重要信息。

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Numerical simulation of the earthquake-generating process and precursory mechanism of strong earthquakes;

强震孕育过程和前兆机理数值模拟；

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