A new AC geo-electrical resistivity observation system and experimental observation in Jiangning seismic station
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图 1 地电阻率交流观测系统框图
Figure 1. Block diagram of AC geo-electrical resistivity observation system
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图 2 2014年10月13—14日江宁台干扰时域(a)和频域(b)分析,图中纵坐标UNS和UEW分别代表南北、 东西方向的噪声幅度
Figure 2. Interference analysis of Jiangning station during 13--14 October 2014 in time domain(a)and frequency domain(b). UNS and UEW represent the noise amplitude in N--S and E--W directions
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图 3 2014年11月—2015年7月1 Hz交流观测与直流观测结果对比
(a)南北测向地电阻率ρNS和均方根误差σNS;(b)东西测向地电阻率ρEW和均方根误差σEW
Figure 3. Comparison of geo-resistivity by DC observation with that by 1 Hz AC observations from November of 2014 to July of 2015
(a)Curves of geo-resistivity ρNS in NS direction and its RMS error σNS; (b)Curves of geo-resistivity ρEW in EW direction and its RMS error σEW
表 1 地电阻率交流观测系统技术指标
Table 1 Technical indicators of AC geo-electrical resistivity observation system
测量主机 稳流电流 采样率/Hz 测量误差/(Ω·m-1) 频带范围/Hz 输出功率/W 供电电流/A 频率抖动/Hz ≥50 0.1%读数+0.02 0.1—10 ≥400 ≥2.5 ＜0.04 
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表 2 江宁台观测场地噪声幅度及信噪比计算
Table 2 Noise amplitude and SNR of Jiangning station
观测时段 噪声信号幅度/mV 人工供电电位差/mV 信噪比/dB 南北测向 东西测向 南北测向 东西测向 南北测向 东西测向 23:00—5:00 0.576 2.104 93 73 44.16 30.81 5:00—22:00 28.43 93.11 93 73 10.29 -2.11
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