
TY  - JOUR
A1  - Kim, H.J. 
A1  - Matsuoka, T. 
T1  - Improved full-waveform inversion of normalised seismic wavefield data
JF  - Exploration Geophysics
JO  - Explor. Geophys.
Y1  - 2006
VL  - 37
IS  - 1
SP  - 86
EP  - 92
KW  - 
UR  - https://doi.org/10.1071/EG06086 
N2  - The full-waveform inversion algorithm using normalised seismic wavefields can avoid potential inversion errors due to source estimation required in conventional full-waveform inversion methods. In this paper, we have modified the inversion scheme to install a weighted smoothness constraint for better resolution, and to implement a staged approach using normalised wavefields in order of increasing frequency instead of inverting all frequency components simultaneously. The newly developed scheme is verified by using a simple two-dimensional fault model. One of the most significant improvements is based on introducing weights in model parameters, which can be derived from integrated sensitivities. The model-parameter weighting matrix is effective in selectively relaxing the smoothness constraint and in reducing artefacts in the reconstructed image. Simultaneous multiple-frequency inversion can almost be replicated by multiple single-frequency inversions. In particular, consecutively ordered single-frequency inversion, in which lower frequencies are used first, is useful for computation efficiency. 
ER  -

