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用高频采样(1/s)监测观测井(EDY井)的水位,发现其变化较大,这与长周期地震波通过引起的动力应变变化相应。例如,在8.1级地震后,距震中1200km的观测点可测得200cm以上的波动。通过与附近体应变的变化比较,观察到水位对应变变化的反应特征为:在18～19s的周期时,反应曲线具有灵敏度峰值和相位变化。在共振周期下,灵敏度达每10~(-9)的应变对应15mm的水位变化。
Monitoring the water level of the observation well (EDY well) with high-frequency sampling (1 / s) found a large variation corresponding to the dynamic strain caused by the passage of long-period seismic waves. For example, after the 8.1 magnitude earthquake, fluctuations of more than 200 cm can be measured from the observation point of 1200 km from the epicenter. By comparing with the change of nearby body strain, it is observed that the response characteristic of the water level to the strain change is that the reaction curve has the peak of sensitivity and the phase change in the period of 18-19s. In the resonant period, the sensitivity of every 10 ~ (-9) of the corresponding strain of 15mm water level changes.