STUDY ON INFLUENCE OF PRESSURE ON GRAVIMETERSGC053 BY USE OF PRODUCT SPECTRA
Wei Jin 1,2,3) ;Li Hui 1,2) ;Liu Ziwei 1,2) ;Hao Hongtao 1,2) ; and Kang Kaixuan 1,2)
1)Institute of Seismology,CEA, Wuhan 430071;2)Crustal Movement Laboratory, Wuhan 430071;3)School of Geodesy and Geomatics,Wuhan University, Wuhan 430073
Abstract The correlation and product spectra between the gravity earth tide for over 13 000 hours observed with SGC053 at Jiufeng station and the barometric pressure were analyzed.It is shown that the barometric pressure is the main factor leading to gravity change. And the atmospheric pressure admittance is -3.116 nms -2/mbar. The atmospheric pressure admitlance is depended on the frequency. According to the 7 product spectral lines, atmospheric pressure admittances was fitted with linear. The frequencydependent atmospheric pressure admittance function is y=7.036x+2.524. The freqDep admittance correction is almost consistent with constant admittance correction. The difference between the corrected results with the two methods is less than ±(1-2) nms -2.
