Analysis of water tube tiltmeter observation affected by reservoir load
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摘要: 河北省易县地震台DSQ型水管倾斜仪NE向2022年2月14日以来观测数据曲线出现趋势下降E倾变化，年变观测数据曲线不同于往年。对该异常进行了分析，并结合三维集中荷载模型模拟计算结果表明：2022年2月14日—4月6日旺隆水库共泄流总库容量达到279.5万m3，造成倾斜变化理论值为1.27×10−7，高于倾斜干扰的限定指标1.455×10−8一个量级，推测旺隆水库泄流荷载是造成易县台水管仪NE分量加速异常变化的主要因素。Abstract: The NE component curve of DSQ water tube tiltmeter at Yixian seismic station in Hebei Province had a downward trend since February 14, 2022. The annual change curve was different from that of previous years. Combined with the simulation results of three-dimensional concentrated load model, it is shown that the total reservoir capacity of Wanglong reservoir reached 279.50×104 m3 from February 14 to April 6, 2022. The theoretical value of tilt change was 1.27×10−7, which is higher than the limit index of tilt interference of 1.455×10−8. It was inferred as the main factor causing the abnormal change of NE component acceleration of water tube instrument at Yixian station.
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Key words:
- water tube tiltmeter /
- load /
- reservoir /
- abnormal
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图 3 易县台水管仪NE分量异常曲线
Figure 3. NE component anomaly curve of water meter at Yixian station
图 4 水库日泄流库容量与水管仪NE分量日值变化对比图
Figure 4. Comparison between daily discharge capacity of reservoir and daily variation of NE component of water meter
图 5 易县台地倾斜各分量分钟值图（2022年2月1日—4月30日）
Figure 5. Minute value map of various components of Yixian station tiltmeter （from February 1 to April 30, 2022）
表 1 易县台山洞地倾斜2022年2月14日—4月6日观测数据统计表
Table 1. Statistics of observation data of ground tilt of cave in Yixian station from February 14 to April 6, 2022
仪器名称 测项 变化量/ms 变化方向 水管倾斜仪 NS分量 661.52 S倾 EW分量 65.53 E倾 NE分量 155.29 E倾 垂直摆倾斜仪 NS分量 33.70 N倾 EW分量 12.00 E倾 
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