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Observation data of DSQ water pipe inclinometer and meteorology at Fengning seismic station from 2021 to 2023 were selected. Correlation analysis and convolution filter analysis were performed on rainfall and observation data, and convolution filter method and regression analysis were used to eliminate the lag effect of rainfall, and the relationship between rainfall and water pipe stress variables was judged. The results show that the trend change of the Fengning DSQ water pipe inclinometer was related to rainfall, and the daily variation of the observed data had a good linear relationship with the rainfall accumulation value, but did not obviously correlate with the instantaneous rainfall, and the response time had a lag of 1 day. Convolution filtering can better eliminate the step change caused by rainfall, but it failed to completely eliminate the southward inclination of NS and eastward inclination of EW after the rainfall of the water pipe meter from June to September 2021. Other factors may also affect the inclination of NS to S and EW to E of the water pipe meter.

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Copyright of Journal of Geodesy & Geodynamics (1671-5942) is the property of Editorial Board Journal of Geodesy & Geodynamics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the statistical data, change trend analysis, accuracy, and co-seismic deformation wave analysis of DSQ water pipe inclinometer and VP vertical pendulum of Wuzhishan Station, it is considered that the quality index of continuity, drift, and internal accuracy data meet the requirements of deformation observation. The water pipe inclinometer and the VP vertical pendulum have great differences in the seismic records of different epicenter distances: ① When the epicenter distance is small, the water pipe instrument has no co-seismic response, and the VP vertical pendulum has the clear co-seismic record; ② When the epicenter distance is greater than 6000 km, the two instruments have a similar recording capability.

This paper compares and analyzes the observation environment, installation and operation of the DSQ-type water pipe inclinometer of the Hohhot reference seismic station and Baotou seismic station, and the observation accuracy, stability, continuity, and reliability of observation data from 2015 to 2017. Contrastive analysis, quality evaluation, and systematic calculation and analysis were performed using multiple processing methods. The quality index of the mean square error of the M2 wave tidal factor is obtained by using the Venidikov harmonic analysis, and the intrinsic quality accuracy was obtained. The Chebyshev polynomial was used to fit and analyze the annual observation data to obtain the relative noise level of the instrument, and the two indicators were compared and analyzed. It is of great practical significance to make a correct understanding and objective evaluation of the precursory observation system of the station’s topographical change observation data, and is beneficial to the future earthquake precursory and prediction research.