摘要:
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。
Abstract:
The activity of minor earthquake of Linxian has characteristies of high frequenc-y, grent undulation, strong rhythm;minor magnitude,shallow focus.high intensity, minor range of activity;high b-value,quick attenuation of sub-sequence, a long duration of the entire process;lower Q-value,Various types etc, Its variation of frequency is the same as the seismicity of the region of Xingtai strong earthquake, and lagged behind about 5-20 months.This has proved that the activity of minor earthquake of Linxi-an is induced by the seismicity of the region of Xingtai strong earthquake.Because its activity is always behind the seismicity of the region,it can't be as a "seismicity precussory window" to monitor earthquake.Finally, the environment of the massif of minor earthquake of Linxian area is discussed.It has been considered that the Linxian basin is a slip-away fractured block extending to the east under the main control of Rencun-Taoyuan fault.Also the triggering condition has been discussed from teclonic.structure ol rock and the activity of pressure-bearing ground water at depth etc.
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