Method of Dynamic Adjustment on Repeated Gravity Measurements
under the Constraint of Absolute Gravity Observations
1 Key Laboratory of Earthquake Geodesy,Institute of Seismology, CEA, 40 Hongshance Road,Wuhan 430071,China
2 Wuhan Base of Institute of Crustal Dynamics, CEA, 40 Hongshance Road,Wuhan 430071,China
3 Graduate School of Chinese Academy of Science, A19 Yuquan Road,Beijing 100039, China
Abstract:〗In this paper we use the repeated gravity measurements of the western Yunnan gravity network with the data length of 1986-2009, as well as absolute gravity observations at Xia Guan, Li Jiang, and Kun Min gravity sites. Linear gravity rate models are employed to estimate the time variation geophysical information. We build dynamic adjustment models under the constraints of absolute gravity observations, and discuss several key questions including the variance metric for both repeated and absolute gravity measurements, the initial values of the models and the iterations’,robust estimation, and statistic hypothesis testing. We obtain the annual gravity rate at each site in the western Yunnan network with a range of (-0.039 5-0.024 1)×10-5ms-2/a, and the precision with a range of (0.001-0.0298) ×10-5ms-2/a, with the difference of (0.003-0.020)×10-5ms-2/a, as compared with the static adjustment method. When we process the national gravity network or the regional gravity network over a relatively large area, especially with multi-network and multi-campaign gravity measurements, the dynamic adjustment model developed in this work can obtain the gravity variation under the united space-time status.
KANG Kaixuan,LI Hui,SHEN Chongyang et al. Method of Dynamic Adjustment on Repeated Gravity Measurements
under the Constraint of Absolute Gravity Observations[J]. jgg, 2015, 35(3): 508-511.