Stable Iterative Methods for Inversion of Magnetotelluric and Transient Electromagnetic Data

Southeast Asian Conference on Geophysics

Nanda Pratama, Ridho^1 ; Widodo^2

Undergraduate Program of Geophysical Engineering, Institut Teknologi Bandung, Indonesia^1

Applied Geophysics and Exploration Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Indonesia^2

关键词: Damping factors;    Eigen-parameters;    Geophysical data;    Marquardt algorithm;    Model parameters;    Shallow structure;    Subsurface structures;    Transient electromagnetics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/62/1/012028/pdf
DOI  :  10.1088/1755-1315/62/1/012028

来源: IOP

【 摘 要 】

The joint inversion of geophysical data can reduce the ambiguity of model parameters. Joint Inversion of Magnetotelluric (MT) and Transient Electromagnetic (TEM) data was performed to get detailed information of subsurface structure. Whereas TEM data is sensitive to describe in the shallow structure, while the deeper structure is related to MT data. We derived the joint inversion scheme from the second order of Marquardt algorithm using singular value decomposition (SVD). The detailed analyses of the model parameters are performed by damping factors, V-matrix, damped error bounds and importances value. The joint models parameters with damping factor and importances value above 0.9 indicate that the associated eigen parameters are well-resolved.