乾陵地震台钻孔体应变观测资料分析

选取乾陵地震台2018—2020年钻孔体应变观测资料，进行完整性、年零漂和观测资料精度分析，通过采样调和分析，评价观测数据质量，并对自然环境变化、仪器系统故障和人为干扰对观测数据的影响进行分析，探讨该台钻孔体应变观测映震能力，认为： ①乾陵地震台体应变测项运行良好，观测数据质量较高； ②降雨、气压是影响体应变观测数据的主要干扰因素； ③体应变对全球7级以上、中国6级以上地震同震响应较明显，震级越大，同震响应持续时间越长。

Analysis on observation data of borehole strainmeter at Qianling Seismic Station

The observation data of borehole strainmeter at Qianling Seismic Station from 2018 to 2020 are selected to analyze the integrity, annual zero drift, and accuracy. Through sampling and harmonic analysis, the quality of observation data is evaluated, and the influence of natural environment change, instrument system failure, and human interference on observation data is analyzed to explore the seismic reflection ability of borehole strainmeter observation at Qianling Seismic Station. It is recognized that: ① The borehole strainmeter measurement items at Qianling Seismic Station operate well. The observation data are of high quality; ② Rainfall and air pressure are the main interference factors affecting the borehole strainmeter observation data; ③ The borehole strainmeter has obvious coseismic response to earthquakes with M ≥ 7 in the world and M ≥ 6 in China. The larger the magnitude, the longer the duration of coseismic response.