河北宽城地震台SS-Y型铟瓦伸缩仪观测系统更新前后观测数据质量对比分析

宽城地震台SS-Y型铟瓦伸缩仪因仪器老化,于2015年12月对观测系统进行更新改造,统计分析2012—2018年改造前后应变潮汐观测数据,全面评价观测资料质量。结果显示,由完整率、年零漂、年变幅等一般资料质量评价指标可知,观测数据连续可靠,仪器运行稳定,且观测系统更新后数据质量有一定程度提高;应变潮汐观测精度较低,相对噪声水平较高,更新后相对噪声水平无明显提升,应变潮汐精度略有下降,应为仪器自身原因所致;观测数据受降雨影响较大,且与降雨量有较强的相关性。

Comparative analysis of the observation data quality before and after the update of the SS-Y extensometer observation system at Kuancheng Seismic Station in Hebei Province

The SS-Y extensometer observation system at Kuancheng Seismic Station was updated in December 2015 due to instrument aging. This paper comparatively analyzes strain tide observation data from 2012 to 2018, before and after the update, and comprehensively evaluate the observation quality. The results show that, based on data quality indexes of integrity rate, annual zero drift, and annual amplitude variation, the observations are continuous and reliable, the operation of the instrument is stable, and the data quality improves to a certain extent after the update. The observation accuracy of strain tide is low, the relative noise level is high, and the relative noise level is not significantly improved after the update, but the accuracy of strain tide is slightly decreased. The observed data are greatly affected by rainfall and have a strong correlation with rainfall.