Analysis of the influence of rainfall change on the YRY-4 borehole strain gauge at Zhaotong seismic station
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摘要: 利用昭通中心站YRY-4钻孔应变仪前兆观测数据资料，提取降雨对该仪器观测数据的干扰事件，采用降雨总量、瞬间最大值降雨量两类降雨分类统计方法，定量分析降雨对观测数据产生的影响。结果表明：当降雨总量达到40 mm、瞬间最大值降雨量大于0.4 mm时，YRY-4钻孔应变仪观测数据受降雨干扰明显；当降雨总量大于40 mm时，降雨总量与观测数据应变量呈线性关系，瞬间最大值降雨量与降雨总量之间无显著的对应关系。分析认为，降雨干扰影响主要来自降雨渗透和台站周边地质抗水体荷载量大小两个方面。定量分析降雨干扰，有利于区分异常与干扰，积累经验，以便于及时对有效异常进行判定，为地震研究服务。
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关键词:
- YRY-4钻孔应变仪 /
- 降雨总量 /
- 瞬间最大值降雨量 /
- 定量分析 /
- 地震研究
Abstract: This paper uses the precursor observation data of the YRY-4 borehole strain gauge at Zhaotong seismic station to extract the interference events of rainfall on the observation data of the instrument. The results show that when the total rainfall reaches 40 mm and the instantaneous maximum rainfall is greater than 0.4 mm, the observation data of the YRY-4 borehole strain gauge is obviously disturbed by the rainfall; when the total rainfall is greater than 40 mm, the total rainfall and the observation data is a linear relationship between the strain variables. There is no significant corresponding relationship between the instantaneous maximum rainfall and the total rainfall. The analysis shows that the influence of rainfall interference mainly comes from rainfall infiltration and the load capacity of the geological water body around the station. Quantitative analysis of rainfall disturbance is helpful to distinguish the difference between anomalies and disturbances, and to accumulate experience so as to facilitate anomaly determination timely and effectively and serve earthquake research. -
图 2 降雨对YRY-4钻孔应变仪应变无干扰情况
Figure 2. Rainfall does not interfere with the strain of the borehole strain gauge
图 4 钻孔应变北南分量、降雨总量对比分析
Figure 4. Comparative analysis of North-South component of borehole strain and total rainfall
图 5 瞬间最大值降雨量与降雨干扰统计散点图
Figure 5. Statistical scatter plot of instantaneous maximum rainfall and rainfall disturbance
图 6 降雨总量与YRY-4钻孔应变仪应变量散点图
Figure 6. Scatter plot of total rainfall and borehole strain gauge strain
表 1 2018—2021年瞬间最大值降雨量及干扰趋势统计表
Table 1. Statistical table of instantaneous maximum rainfall and disturbance trend from 2018 to 2021
序号 时间 瞬间最大值降雨量/mm 曲线走势 1 2018年2、3、4、5、10月 0.50、0.45、0.63、0.45、0.50 无变化 2 2019年2、3、4、5、11月 0.70、0.73、0.64、0.72、0.89 向北变化 3 2020年3、4、5、6、9月 0.61、0.56、0.72、0.46、0.55 无变化 4 2021年2、3、6、10、11月 0.77、0.73、0.75、0.88、0.94 向南变化 
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表 2 2018—2021年降雨总量干扰YRY-4钻孔应变仪事件统计
Table 2. Statistics of total rainfall interference with borehole strain gauge events from 2018 to 2021
序号 时间 降雨总量/mm 曲线走势 1 2018年5、6、7、8、9月 62.9、60.4、62.3、62.0、63.0 向上加速变化 2 2019年4、6、7、8、9月 58.9、59.1、60.0、61.8、59.9 向下加速变化 3 2020年3、6、7、8、9月 57.2、63.1、62.8、61.4、59.7 向下加速变化 4 2021年6、7、8、9、10月 59.9、61.4、63.2、61.8、59.8 向下加速变化
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