广东数字化形变观测资料质量评价

Quality Evaluation of Digital Deformation Observation Data in Guangdong

通过对广东各数字化形变观测仪器潮汐因子中误差、相位滞后及仪器零漂等参量的计算,对仪器观测资料的连续性、稳定性及观测质量进行了分析和评价。分析结果认为:各台仪器的观测精度基本达到了中国地震局形变Ⅰ类台的标准;地倾斜类观测仪器精度高,稳定性好,尤其是水管倾斜仪的稳定性及精度较高;垂直摆倾斜仪的漂移较大且资料精度较低。伸缩仪和钻孔应变仪资料精度较高;但钻孔应变仪汕头台漂移较大,仪器稳定性不及信宜台;信宜、汕头各形变台观测资料总体质量较好,韶关台次之,潮州台较其它台受干扰大、相对噪声大,资料的稳定性及精度较低,说明台址条件是决定观测质量的重要因素之一。

Based on the calculation of the MSE of tidal factors,phase lag and zero drift of the digital deformation observation instruments in Guangdong, the continuity, stability and observation quality of the instrument observation data are analyzed and evaluated. The analysis results show that: the observation accuracy of each instrument basically meets the standards of Class I deformation stations of China Earthquake Administration;the ground tilt observation instruments have high accuracy and good stability,especially water pipe inclinometer;the vertical pendulum inclinometer has larger drift and lower data accuracy. The data accuracy of the extensometer and the borehole strain gauge is high;but the drift of borehole strainmeter at Shantou station is large,and the stability of instrument is not as good as that of Xinyi station;the overall quality of observation data from Xinyi and Shantou deformation stations is better than that from Shaoguan station. The deformation observation data of Chaozhou station is disturbed with highly noisy. The stability and accuracy of the data are lower than that from other stations,which indicates that the site condition is one of the important factors to determine the observation quality.