西安地震台新建与原形变山洞DSQ型水管倾斜仪观测资料对比分析

西安地震台新建与原形变山洞引洞进深、覆盖层厚度、观测环境等存在差异，山洞内各架设一套DSQ型水管倾斜仪进行形变观测。选取2套仪器2020年观测数据，就数据完整率、固体潮波形记录、自然环境干扰、强远震同震响应、数据内在质量等进行对比分析。结果表明： ①与原形变山洞相比，新建山洞观测数据的稳定性、内在质量较优；②新建山洞架设的水管仪基本不受大风、降雨等自然环境干扰的影响； ③受人员参观影响，新形变山洞水管仪数据完整率、相对噪声水平略差； ④基线长度不同，可能是2套仪器记录强远震同震响应幅度不同的原因之一。总体上，随着新建形变山洞观测环境的逐渐稳定，其各项指标具有稳中向优的趋势。

Comparative analysis of observation data of DSQ water-tube tiltmeter in original and newly-built deformation observation caves

There are differences in the depth, the thickness of the overburden, and the observation environment between the newly-built and the original deformation caves of Xi’an Seismic Station. A set of DSQ water-tube tiltmeter is deployed in each cave for deformation observation. The observation data of two sets of instruments in 2020 are selected for comparative analysis in the aspects of data integrity, solid tide waveform recording, natural environment interference, coseismic response of strong and distant earthquakes, internal quality of data, etc. The results show that: ① Compared with the observations in the original deformation cave, the stability and internal quality of the observation data in the new cave are better; ② The observations of the watertube tiltmeter deployed in the new cave were basically not affected by the interference of natural environment such as strong wind and rainfall; ③ Affected by the visits, the data integrity and relative noise level of the observations in the newly-built cave are slightly poor; ④ The different baseline length may be one of the reasons for the different coseismic response amplitudes recorded by the two sets of instruments. In general, with the gradual stabilization of the observation environment of the newly-built deformation cave, its indicators have a trend from stable to excellent.