Analysis of anomalous changes in terrain caused by environmental disturbance events

To clarify the impact of environmental disturbance events on deformation observations, this study analyzed the correlation between abnormal deformation data recorded at Yixian seismic station from 2014 to 2023 and corresponding load disturbances using a three-dimensional quantitative model. The findings are as follows: Seven instances of abnormal deformation at Yixian seismic station were confirmed to be directly triggered by load disturbances; Environmental disturbances have a significant impact on the SS-Y extensometer data, with a contribution rate of 100%, whereas their impact on the DSQ water pipe inclinometer data is much lower at 28.37%; Abnormal responses in the cave-based deformation instruments are most pronounced when the disturbance source lies within 500 m and the applied load reaches 1000～1500 t.