【摘要】 本文通过对新04井2001年7月数字化改造以来水位同震变化观测资料分析、地震活动性对比和井孔地质构造条件等的综合研究,得到以下认识:①无论地震的方位和震源机制如何,新04井水位同震变化总是具有下降-回升的变化规律;井水位同震下降幅度随震级的增大而增大,随井震距的增大而减小,三者之间有良好的相关性。②新04井水位同震响应能力受本地应力状态的影响,当井区附近孕震时,断层受到挤压闭锁,透水能力下降,井水位同震响应能力降低;地震发生后,断层解锁,透水能力恢复,井水位同震响应能力也恢复到正常状态。③新04井位于断裂交汇区,岩石破碎,裂隙节理发育,井孔穿过断层破碎带,具备水位同震下降的地质背景条件;受7级以上强震S波或面波的激发,穿过井孔的断层发生张合作用或蠕动,引起井水外泄可能是井水位同震下降变化的原因。更多还原

【Abstract】 The authors analysis coseismic changes of water level based on digital observation from Xin-04 well since July 2001,seismicity and geological structure near the well.The result shows:① The cosismic changes of water level are consistently following the process of drop-recovery regardless of epicentral directions or focal mechanism of earthquakes.The amplitude of water level drops increases with the earthquake magnitude,and decreases with epicentral distances.They have rather well correlation.② The response of Xin-04 well to seismic wave may be affected by the local stress state.When a moderate earthquake is prepared near the well,the fault is compressed and locked causing the ability of permeability and response to earthquake decreases.After the earthquake,the fault is unlocked and the ability of response to earthquake recovers.③ The Xin-04 well is located in the intersections between faults where much fissure and joint exist in fragmental rock.The well passes through broken fractures,having the geological background of water coseismic drop;the fault opening-closing or creep slipping caused by S wave or surface wave of M > 7.0 earthquake leads to water flowing out,which may be the main factor of water coseismic drop.更多还原