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林县小震活动具有频度高,起伏大,韵律性强,震级小,震源浅,烈度高,活动范围小,b值高,子序列衰减快,全过程持续时间长;Q值偏低,类型多样等特点。其频度变化与邢台强震区地震活动的频度变化十分吻合,且滞后5-20个月,证明了林县小震活动是受邢台强震区地震活动的诱发而形成。因其活动总滞后于区域地震活动,所以不宜作为监视地震的“震情窗口”。最后,概要地论述了林县小震区的地体环境,认为林县盆地是一个以任村-桃园断裂为主控断裂的、向东伸展的破碎滑脱体。并从构造、岩石组成及深层承压水活动等方面对诱发条件进行了讨论。
The small earthquake activity in Linxian County has the characteristics of high frequency, large fluctuation, strong rhythmicity, small magnitude, shallow source, high intensity, small range of motion, high b value, fast decay of the sub-sequence and long duration of the whole process; low Q value, Diverse types and so on. The variation of frequency is in good agreement with the frequency of seismic activity in the strong earthquake area in Xingtai and lags 5-20 months. It proves that the small earthquake activity in Linxian County was induced by the seismic activity in the strong earthquake area in Xingtai. Because of its activity lags behind the total regional seismic activity, it should not be used as a “seismic window” monitoring the earthquake. Finally, the article summarizes the terrestrial environment of the Linxian small earthquake area, and considers that the Linxian Basin is a fractured and slipping body that extends eastward due to the Rencun-Taoyuan fault. The conditions of induction were discussed in terms of tectonics, rock composition and deep pressure water activities.