北京延庆五里营地下流体资料时频特征与地震活动关系

Time-frequency characteristics of groundwater in Wuliying monitoring well, Yanqing, Beijing and its relationship with regional seismic activity

选取北京延庆五里营地震监测井为研究对象,分析了该井流体测项资料的时频特征。结果表明:①流体各测项资料在时间域表现有凸峰和集群峰值等异常,在频率域也有非常明显的高频率短周期增强等显著异常;②地下流体的时频特征呈明显的时间分布规律:水位、水温、气体和阴离子分别在2014至2016年出现异常变化;③五里营井流体资料时频特征异常在时间上很可能指示了所在研究区和邻近地区2016年地震活动加剧。

This paper analyzes the time-frequency characteristics of groundwater level,temperature and geochemistry,according to the monitoring data from Wuliying monitoring Well,Yanqing,Beijing.The results show that:①These monitoring data have convex and cluster peak in time domain,and also have significant abnormalities such as enhancement of high frequency short period in the frequency domain.②These monitoring data have obvious time distribution pattern:the groundwater level,temperature,gas and anion respectively showed abnormal changes from 2014 to 2016.③The abnormal time-frequency characteristics of monitoring data of Wuliying well may likely indicate the intensification of seismic activity in 2016 in the study area and adjacent areas.