黄骅井水位对苏门答腊5次地震的同震响应初步研究

利用ARX模型分析了河北省黄骅井水位对气压和固体潮的响应特征,并利用该模型消除气压和固体潮对该井水位的影响,准确地提取了5次苏门答腊大震引起的同震水位变化异常.分析了该井水位对这5次地震的同震响应模式与震级和震源机制解的关系,初步探讨了引起该井水位同震变化复杂性的可能原因.认为,即使发生在同一地区,震源机制解基本相同的地震也会引起远距离同一井水位不同的响应特征,其响应幅度与发震震级有关,响应方式可能与井孔所处地区的局部应力应变状态或井-含水层系统的结构变化有关.

Preliminary Study on Coseismic Response of Huanghua Well Water Level to 5 Times of the Sumatra Earthquakes

This paper analyzes in terms of ARX model the characteristics of the water level response at Huanghua Well of Hebei Province to barometric pressure and earth tides, and eliminates barometric pressure and tidal effects. Coseismic changes of the well water level of 5 times were accurately extracted corresponding to the Sumatra earthquakes. We analyzed the relationship between the coseismic changes of this well water level and the earthquake magnitudes, focal mechanism solutions. The possible complicated reasons of coseismic water level response were preliminarily discussed. The result indicates that earthquakes will also lead to different response characteristics to the same longdistance water wells even though the earthquakes happen at the same area, and basically belong to the same focal mechanism solution. The response amplitude of well water level is related to earthquake magnitudes. The way of response may be related to the local stress-strain state and the structure of well-aquifer system in the borehole area.