Analysis of the tidal gravity observations in Three Gorges reservoir area

• 来源期刊: 地震学报(英文版)
• 学科: 地球科学
• 年，卷（期）: 2007,（5）
• 页码范围: 523-531
• 页数: 9页
• 分类号: P312.4
• 语种: 英文

摘要

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)×10-8 m·s-2V-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.