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本文通过对位于中国大陆不同活动地块交界处的4口地下水位观测井的研究,探索了地震前后潮汐因子及相位滞后的变化情况.这些观测井位于几条活动断裂带上,并且对汶川地震同震水位响应幅度较大.本文收集了该4口井2007～2009年的水位整点观测值并进行处理分析,分别计算出各个观测井水位在汶川地震前后的潮汐因子、相位滞后和潮汐残差相位差变化,发现汶川地震发生时四口井潮汐因子处于快速变化阶段,而相位滞后和潮汐残差相位差则在迅速下降阶段,反映了孕震过程中井-含水层系统所受的应力应变变化过程.
In this paper, the changes of tidal factor and phase lag before and after the earthquake are explored through the study of 4 groundwater level observation wells located at the junction of different activity plots in China.These wells are located on several active fault zones, The response of the coseismic water level is relatively large.This paper collects the observation data of the whole point of the water level from 2007 to 2009 in the four wells and analyzes them, and calculates the tidal factor, phase lag and tidal residual of each observation well before and after the Wenchuan earthquake We find that the tidal factors of the four wells are in a rapidly changing phase when the Wenchuan earthquake occurs and the phase lag of the phase lag and the tidal residual are in a rapidly decreasing phase and reflect the stress and strain suffered by the well-aquifer system during the seismogenic process transformation.