无极冀20井地震前后水流运动方向研究  

Analysis of Water Flow Direction of Wuji Well before and after Earthquake

作　　者：董博[1] 纪春玲[1] 章阳 周安聘 DONG Bo;JI Chunling;ZHANG Yang;ZHOU Anpin(Shijiazhuang Central Seismic Station,Hebei Earthquake Agency,Shijiazhuang,050021,China)

机构地区：[1]河北省地震局石家庄中心台,石家庄050021

出　　处：《华北地震科学》2021年第3期51-57,共7页North China Earthquake Sciences

摘　　要：对无极冀20井2009—2019年地震前后水位潮汐参数变化特征进行分析,发现无极冀20井的潮汐参数动态变化分为4个阶段:①2009—2010年M_(2)波和O_(1)波相位值多次出现正负号的转变,且两波数值大小不定,表明此时间段内水流以垂向运行为主,受裂隙影响;②日本本州地震能量密度为4.21×10^(−2) J/m^(3),震后水流运动方向发生改变,说明震后含水层渗透系数得到改变并导致孔隙压力重新分布;③尼泊尔地震能量密度为1.399×10^(−3) J/m^(3),震后水流运动方向由径向变为垂向,含水层和隔水层之间发生水流交换,在压应力作用下含水层向隔水层排水;④2018年下半年井水位主要受径向排水影响,E'/E<1条件下垂向排水为辅,水流主要运动方向为径向。最后根据前人不同的研究方法、模型对所得结论进行检验,结果符合预期。In this paper,the characteristics of tidal parameters of Wuji well before and after the 2009~2019 earthquake are analyzed.The results show that:the variation characteristics of tidal parameters in Wujiji 20 well can be divided into four stages:(1)From 2009 to 2010,the phase values of M_(2) wave and O_(1) wave changed many times,and the value of the two waves was uncertain.It was concluded that the water flow in this period was mainly vertical and affected by fractures.(2)The energy density of Honshu earthquake in Japan was 4.21×10^(−2) J/m^(-3),and the water flow direction changed after the earthquake,indicating that the permeability coefficient of aquifer was changed and the pore pressure was redistributed.(3)The energy density of Nepal earthquake was 1.399×10^(−3) J/m^(-3).After the earthquake,the water flow direction changed from radial direction to vertical direction.Water exchange occurred between aquifers and aquifers,and aquifer drained into aquifers under compressive stress.(4)In the second half of 2018,the well water level is mainly affected by radial drainage,supplemented by vertical drainage under the condition of E'/E<1,and the main flow direction is radial.Finally,according to different research methods and models,the results are in line with expectations.

关 键 词：垂向 径向 潮汐参数 能量密度 

分 类 号：P315.72[天文地球—地震学]