Studying the characteristics of regional strain field using four-component borehole strain observations from Xuzhou Seismic Seismic
Using the four-component borehole strainmeter data collected by the Xuzhou Seismic Station from 2009 to 2022,this study analyzed the stress-strain state of the observation area through mechanical conversion and multiscale data fitting.The research results show that the observation area near the Xuzhou Station exhibited a stable over-pressured state during the observation period,with stable rates of change in principal strain.The annual change rates of maximum and minimum principal strain were approximately-4 132 × 10-1oand-6 788 × 10-10,respectively,while the annual change rates of plane strain and shear strain were approximately 10 919× 10-10 and 1 328 × 10-10.The principal strain change direction was 136°.By combining the tide harmonic analysis diagram drawn using the Venetikov tidal harmonic analysis method,it was found that the direction of the tidal factor increase in the four-component borehole strainmeter was consistent with the direction of the maximum principal compressive strain calculated through fitting,providing important evidence for accurately judging the regional stress state.To analyze the stress field characteristics from a broader perspective,this study also used GNSS data to analyze the horizontal velocity field in Jiangsu and its neighboring regions.The GNSS analysis results show that Jiangsu as a whole exhibits a southeastward movement trend,which is consistent with the principal strain change direction observed by the four-component borehole strainmeter,further verifying the reliability of the observation data collected by the Xuzhou Station.
stress-strain characteristicsvenidikov harmonic analysisprincipal direction of strainfour-component borehole strain gauge
万方数据
维普
