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首页> 外文期刊>Pure and Applied Geophysics >Noise Reduction in Long-term Self-potential Monitoring with Travelling Electrode Referencing
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Noise Reduction in Long-term Self-potential Monitoring with Travelling Electrode Referencing

机译：行电极参考的长期自电势监测中的降噪

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摘要

— The long-term monitoring of the electric self-potential (SP) in geophysical systems is affected by electrode degradation and drift. This error contribution can be reduced if the electrodes of measuring dipoles are referenced to the same accessory electrode, moved in turn at each pole. The benefit of this travelling electrode referencing scheme (TER) has been evaluated in a dedicated experiment performed from March 2000 to March 2001 at Tribhuvan University, Nepal. Two prototype monitoring points separated by 55 m have been instrumented with pairs of lead-lead chloride Petiau electrodes, installed in buckets filled with salted bentonite at a depth of 1 and 2 meters. The electrical potential at 1 and 2 meters depth was also accessible from the surface by pipes filled with salted bentonite. Over one year, the measurement error, defined as the standard deviation of the difference between the measured potential and the true SP at a given time, is estimated to be 5 mV. This error value is reduced to less than 1 mV with TER. After correction, a smooth annual variation with amplitude of 10 to 15 mV is observed and is interpreted as streaming potentials associated with the monsoon and subsequent drying. These results provide significant guidelines for precision long-term SP monitoring, in particular in tropical volcanic or tectonically active regions.
机译：—长期监测地球物理系统中的自电位（SP）受电极退化和漂移的影响。如果将测量偶极子的电极引用为在每个极点上依次移动的同一辅助电极，则可以减少这种误差。在2000年3月至2001年3月于尼泊尔的特里布万大学进行的一项专门实验中，已经评估了这种行进电极参考方案（TER）的好处。两个相距55 m的原型监测点已安装了成对的氯化铅-Petiau电极对，安装在装有盐渍膨润土的桶中，深度为1米和2米。装满盐渍膨润土的管道也可以从地面获得1米和2米深度处的电势。一年多来，测量误差定义为给定时间的测量电势与真实SP之差的标准偏差，估计为5 mV。使用TER，该误差值减小到小于1 mV。校正后，观察到幅度为10至15 mV的平稳年度变化，并被解释为与季风和随后的干燥有关的流动电位。这些结果为精确的长期SP监测提供了重要指导，尤其是在热带火山或构造活动区域。

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