ON RELATIVE WEIGHT PROBLEM IN JOINT INVERSION USING LEVELLING AND GRAVITY DATA
Fu Yuning 1,2) ; and Xu Caijun 1,2)
1)School of Geodesy and Geomatics,Wuhan University,Wuhan 4300792)The Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, School of Geodesy and Geomatics,Wuhan University, Wuhan 430079
Abstract How to determine the relative weight ratio factor λ is an important problem when joint inversion is carried out by use of two or more than two types of observed data. Several means which are used to determine λ in joint inversion using leveling and gravity data are presented, and then these means are discussed through an example of inversing the parameters of a fault and its displacement with the simulated levelling and gravity data. The results show that the normalization is important in the joint inversion. The inversion result is good by use of the relative weight ratio λ determined by Helmert variance estimation combining prioriposterior information.In addition,the distribution of observation stations and the number of inversed parameters well affect the value of λ.
