Analysis of the tidal gravity observations in Three Gorges reservoir area

• Published in: Acta seismologica sinica Vol. 20; no. 5; pp. 523 - 531
• Main Authors: Chen, Xiao-dong, Sun, He-ping, Hu, Guo-qing, Xiang, Da-peng, Hao, Xing-hua, Liu, Ming, Zhang, Chuan-zhong, Yuan, Qu
• Format: Journal Article
• Language: English; Chinese
• Published: Beijing Springer Nature B.V 01.09.2007
• Subjects: Canyons; Earthquakes; Geodesy; Geodetics; Geophysics; Gravimeters; Gravitation; Gravity; Grounds; Mathematical models; Plate tectonics; Reservoirs; Scripts; Seismic activity; Seismic phenomena; Seismology
• ISSN: 1000-9116; 1674-4519; 1993-1344; 1867-8777
• DOI: 10.1007/s11589-007-0523-z

The comparative observations of the tidal gravity in Three Gorges reservoir area, recorded with the LCR-ET20 gravimeter from Institute of Geodesy and Geophysics, Chinese Academy of Sciences and the DZW-9 gravimeter from Institute of Seismology, China Earthquake Administration, are introduced. High-accuracy tidal gravity parameters in this area are obtained, and the scale factor of the DZW-9 gravimeter is also estimated at a value of -(756.06±0.05)×10^sup -8^ m·s^sup -2^V^sup -1^. The observed residuals of the corresponding instruments are investigated. Numerical results indicate that the long-term drift of the DZW-9 gravimeter appears a linear characteristic, and the observed accuracy is of the same order comparing with that of the LCR-ET20 gravimeter. The results given in the paper can provide with an effective reference model of the tidal gravity correction to the ground based and space geodesy.[PUBLICATION ABSTRACT]