琼粤桂地区定点形(应)变监测内在精度分析OA

As a key earthquake monitoring area in South China,high-precision deformation data plays an impor-tant supporting role in seismic situation judgment in Hainan,Guangdong and Guangxi regions.This paper quantita-tively analyzed the intrinsic precision of continuous observation data from 11 sets of deformation observation instru-ments(including ground tilt and ground strain types)at 6 stations in Hainan,Guangdong and Guangxi regions from January 2015 to May 2023.The results show that the two directional components of the DSQ water tube tiltmeter and extensometer at Wuzhishan Station,the SSY invar rod extensometer at Wuzhou Station,and the two orthogo-nal components of the vertical pendulum at Shantou Station have strong stability,with α values close to the ideal value of 1.0.The intrinsic stability of the North-South(NS)component of all instruments in the region is generally better than that of the East-West(EW)component.By combining the operation status of instruments,installation en-vironment and operation and maintenance management practices,this paper deeply discusses the key factors affect-ing data reliability,and puts forward targeted improvement suggestions,providing technical reference for enhanc-ing the crustal deformation monitoring efficiency and precursor information identification capability in this region.