At present, the general methods to determine seismicity parameters in seismic risk model all emphasize to delete aftershocks.The reason is that the seismicity model used is Poisson model.

• 摘要目前通用的地震危险性模型在确定有关地震活动性参数时都强调删除余震，其理由是因为所应用的地震活动模型是泊松模型。