怀来地震台线应变测项群井抽水干扰分析

怀来地震台伸缩仪观测曲线年变形态每年出现2次较大幅度的阶跃型上升，且变化幅度大小不同。对该地震台观测山洞周边4 km范围内抽水井的分布、2016-2017年季节性抽水时间、抽水量、群井开抽数量等进行调查，并与伸缩仪观测曲线异常变化进行对比分析，发现在时间及变化幅度上，二者同步性较好，分析认为形变观测的周期性大幅度上升变化应与观测山洞周边群井抽水有关，非地震前兆异常变化；并对抽水引起的形变观测机理进行初步分析，提出干扰消除方法。

Analysis on the disturbance of line strain observation by the wells pumping water at Huailai Seismic Station

The annual deformation state of the stretcher curves observed at Huailai Seismic Station shows two large-scale step-by-step increases every year, and the variation amplitudes are different. The distribution of pumping wells, seasonal pumping time from 2016 to 2017, pumping volume and the number of open wells in the area of 4 km around the observation cave at the seismological observatory were investigated and compared with the changes of the observed curves by the extensometer. It was found that the synchronization of the two curves was good in time and amplitude of variation, and the periodicity of deformation observation was considered. The large-scale rise and change should be related to the water pumping at the wells around the cave, and non-seismic precursory anomaly changes; the deformation observation mechanism caused by pumping is preliminarily analyzed, and the interference elimination method is proposed.