The earthquake sequence is foreshock-mainshock-aftershock.
地震序列类型为前震—主震—余震型；
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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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