武汉及周边地区数字化形变观测资料质量分析

Analysis of deformation observation data change characteristics in Wuhan and its surrounding area

对武汉及周边地区2007—2016年数字化形变观测资料进行长期背景跟踪分析,认为形变观测资料的日均变化幅度、M2波潮汐因子均方差、长周期拟合相对噪声水平等指标变化稳定,资料可信度高,DSQ型水管倾斜仪观测精度与资料稳定性均优于SS-Y型铟瓦棒洞体应变仪。对武汉狮子山及黄石地震台形变观测数据典型变化进行系统总结与跟踪分析,发现主要受到人为干扰(调零、标定)、自然环境(降雨、气压)和观测系统故障等因素影响。

Based on the observation data of the digital deformation instruments from 2007 to 2016 in Wuhan and its surrounding area (including Wuhan Seismic Station and Huangshi Seismic Station), the characteristics of the long-term observation background were described in this paper. The results showed that, the indicators of daily variation, mean square error of M2 wave tide factor and relative noise level were reliable. Furthermore, the observation precision and stability of DSQ water tube tiltmeter were superior to SS-Y strain parameter. In addition, typical variation characteristics of the deformation observation data were summarized at Wuhan Seismic Station and Huangshi Seismic Station. The major influence factors are human disturbance(zero setting, calibration), natural environment (rainfall, air pressure) and the fault of observation system.