金州台水准观测的地下水影响改正研究

Research on correction of influence of underground water to leveling observation at Jinzhou seismic station

对于受地下水影响显著的金州台WN向水准观测资料,在使用时需要进行干扰排除。具体做法是,根据地下水对普通基岩标志作用机理和套管标志的埋设情况,先对地下水位的数据进行变换、对有关参数进行确定,然后推导出地下水对西点标志影响量的计算公式并求解,最后在WN向水准观测高差中将其排除。算例和分析表明,该方法较好地解释了地下水对金州台水准观测不同阶段的不同影响原因,并且是定量排除地下水干扰的一种比较好的方法。它能较好地提取水准观测高差中的异常信息,提高了水准观测资料在地震预测预报中的使用价值。

The influence of underground water to the leveling observation should be eliminated when the observational data are used for quantitative analysis. According to the action mechanism of underground water to ordinary bedrock mark and the situation of laying steal pile mark, we need to change the data of underground water firstly and define the interaction coefficient. Then to deduce calculus formula of underground water acting to West mark and calculate it. Finally to eliminate it from high-contrast in West-North level. This way can explain the reason why Jinzhou station leveling is affected by underground water during the different stages, and can quantitatively remove disturbance from underground water. It can acquire abnormal information from high-contrast result of leveling observation and can improve the application value of leveling observation data in earthquake prediction.