Analysis of observation data of TJ-2 volumetric strain gauge at Yixian seismic station

This article selected the monitoring data of the TJ-2 volumetric strain gauge at Yixian seismic station from 2020 to 2022, and analyzed the continuity, completeness, annual drift, and accuracy of the volumetric strain data during this period. By analyzing the impact of natural weather changes, instrument failures, and human interference on the monitoring data, the article discussed the observation and seismic reflection ability of the Yixian seismic station. The conclusion incledes: ① The TJ-2 volumetric strain gauge at Yixian seismic station operates well and has high monitoring data quality. ② Natural weather change (rainfall, atmospheric pressure) are the main interfering factors affecting the monitoring data of the TJ-2 volumetric strain gauge. ③ The TJ-2 volumetric strain gauge exhibits extremely significant co-seismic responses to earthquakes with global MS≥7.0 and domestic MS≥6.0. The larger the magnitude and closer the epicenter distance, the longer of the duration of the monitoring data curve’ s co-seismic response. Due to the early installation time of the TJ-2 volumetric strain gauge at Yixian seismic station, severe aging of the line, and disorderly installation of the station’s instrument circuits, circuit interference often occurs. Therefore, it is necessary to optimize the instrument’s power supply line to improve the quality of observation data.