A method for locating interference source by long-and-short polar distance ratio and its practical application in geoelectric field observation
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摘要: 提出长短极距比值干扰源定位方法用来定位地电观测中出现的地表干扰源。该方法基于均匀半空间模型且地表干扰为点电源，利用地表不同位置的干扰源所引起的同测向长短极距的电场变化差异，联合多测向比值来定位干扰源位置，并应用到徐庄子台漏电干扰一例和高邮台偶极源试验中。结果表明：利用长短极距比值法，能有效定位干扰点源，且能定位偶极干扰源的其中一个电极。Abstract: The long and short pole distance ratio method in geoelectric observation is employed here to locate the near-surface disturbance sources, on the assumption of a uniform half-space model and that the near-surface disturbance is a point source. The disturbance sources of different locations can cause different increments in the long-pole-distance and short-pole-distance geoelectric field at the same direction, which is the key mind of this method. By combining multi-directional long-and-short pole distance ratios in geoelectric field, we successfully applied this method into locating the disturbance sources of the leakage at Xuzhuangzi station and the dipole source test at Gaoyou station. The results show that the point source producing the interference in geoelectric field at Xuzhuangzi station can be effectively located, and one electrode of the dipole source can be discovered in the Gaoyou station test as well.
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图 1 我国地电场观测布极方式示意图
（a） 十字形布设；（b） L形布设
Figure 1. Schematic diagram of the electrode arrangement for our geoelectric field observation
（a） Cruciform layout；（b） L-shaped layout
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图 2 不同的电极布设坐标示意图（左）、地电场长短极距比值分布图（中）和比值确定时的等值线图（右）
（a） 十字形东西向；（b） L形东西向；（c） L形北东向
Figure 2. Schematic diagram of different electrode layout coordinates （left），distribution of the long and short pole distance ratio for geoelectric field （middle），and contour map when the ratio is determined （right）
（a） Cross-shaped east-west direction；（b） L-shaped east-west direction； （c） L-shaped north-east direction
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图 3 长短极距比定位漏电干扰源示意图
Figure 3. Schematic diagram of locating leakage interference source by long-and-short polar distance ratio
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图 4 徐庄子地震台地电场观测系统电极布置方式示意图 （单位：m）
Figure 4. The sketch map of layout patterns for electrodes in geoelectric field observatory systems at Xuzhuangzi seismic station （unit：m）
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图 5 徐庄子台2010年11月16日地电场分钟数据对比曲线
Figure 5. Comparison curves of minute data of geoelectric field at Xuzhuangzi station on November 16，2010
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图 6 徐庄子台干扰源定位结果示意图
Figure 6. Schematic diagram of the location result of the interference source at Xuzhuangzi station
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图 7 高邮地震台地电场及地电阻率同场观测电极布极图（单位：m）
Figure 7. The sketch map of layout patterns for electrodes in geoelectric field and earth resistivity observatory systems at Gaoyou seismic station （unit：m）
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图 8 偶极干扰源试验定位结果示意图
Figure 8. Schematic diagram of the location results of the dipole interference source test
表 1 徐庄子台干扰电场长短极距比
Table 1 Long-and-short polar distance ratio of interference electric field at Xuzhuangzi station
下载: 导出CSV
表 2 偶极源试验中干扰电场长短极距比
Table 2 Long-and-short polar distance ratio of interference electric field in dipole source test
下载: 导出CSV
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