三分量应变仪观测数据自检分析

The self-test analysis on the observation value of three-component strain meter

利用应变矢量合成与分解原理,分析了离石地震台三分量应变仪数据变化的可靠性,结果表明,NS分量与EW分量合成的NE分量与实际观测的NE分量的比值时序图以及利用回归模型得到的外推数据与实际观测值对比图均不符合自检理论,因此,NS分量2014年8月的快速变化不是地壳应变引起的,可能由于仪器本身问题造成的。

The reliability of observation data from three-component strain meter at Lishi seismic station is analyzed by the synthesis and decomposition principle of strain vector and the bivariate regression model. The results show that the ratio of NE component compounded by NS component and EW component and the observed NE component,and the contrast figure of extrapolation data obtained by regression model and the observed value are not in conformity with the theory of self-test. Therefore,the rapid change of NS component in August,2014 is not caused by crustal strain,and probably due to the instrument itself.