IN-SITU CALIBRATION OF GUZA STATION''''S 4-COMPONENT BOREHOLE STRAINMETER
姑咱台四分量钻孔应变观测的实地标定

In order to improve the accuracy of observations and make further research,the in-situ relative calibration and absolute calibration of the 4-component borehole strainmeter at Guza station were made.In these calibrations,the influence of phase lag on the coupling coefficients sufficiently was considered and eliminated,thus the accuracy of the coupling coefficients has been obviously improved after in-situ calibration.