TITLE:
A MATLAB-Based Numerical and GUI Implementation of Cross-Gradients Joint Inversion of Gravity and Magnetic Data
AUTHORS:
Junjie Zhou, Xingdong Zhang, Chunxiao Xiu
KEYWORDS:
Joint Inversion, Cross Gradients, Gravity and Magnetic Data, Numerical Implementation, Graphic User Interface
JOURNAL NAME:
Journal of Software Engineering and Applications,
Vol.8 No.2,
February
15,
2015
ABSTRACT: The cross-gradients joint inversion
technique has been applied to multiple geophysical data with a significant
improvement on compatibility, but its numerical implementation for practical
use is rarely discussed in the literature. We present a MATLAB-based
three-dimensional cross-gradients joint inversion program with application to
gravity and magnetic data. The input and output information was examined with
care to create a rational, independent design of a graphical user interface
(GUI) and computing kernel. For 3D visualization and data file operations,
UBC-GIF tools are invoked using a series of I/O functions. Some key issues
regarding the iterative joint inversion algorithm are also discussed: for
instance, the forward difference of cross gradients, and matrix pseudo inverse
computation. A synthetic example is employed to illustrate the whole process.
Joint and separate inversions can be performed flexibly by switching the
inversion mode. The resulting density model and susceptibility model
demonstrate the correctness of the proposed program.