气象要素对巴里坤水平摆倾斜观测的影响

Influence of meteorological factors on the horizontal pendulum tiltmeter at Barkol Seismic Station

通过对比、相关性和回归分析,探讨了气温、气压和降水对巴里坤水平摆倾斜的影响,进而定量剔除了倾斜观测中的年变信息。结果显示:①倾斜观测受气温的影响最大,且气温对EW分量的影响明显大于NS分量;②降水会造成倾斜观测数据短期内出现波动变化,且具有延后效应,NS分量受降水影响的程度大于EW分量;③气温、气压参与拟合的回归方程,能较好地消除倾斜观测年变信息,凸显震前异常趋势变化。

In this paper,the influences of air temperature,air pressure and precipitation on the horizontal pendulum tiltmeter at Barkol Seismic Station are discussed by comparison,correlation and regression analysis,and the annual variation information in the tilt observation is removed quantitatively.The results show that:①The tilt observation is most affected by air temperature,and the influence of air temperature on the EW component is significantly greater than that on the NS component.②Precipitation can cause short-term fluctuation of tilt observation,which has a delayed effect.The NS component is more affected by precipitation than the EW component.③The regression equation fitted by air temperature and air pressure can effectively eliminate the annual variation information of tilt observation and highlight the abnormal trend change before earthquakes.