
%0 Journal Article
%A Brittan, John 
%A Yuan, Jerry 
%A Long, Andrew 
%T Resolving small-scale heterogeneities with dense non-hyperbolic seismic tomography
%J ASEG Extended Abstracts
%D 2006/03/01
%V 2006
%N 1
%P 1-4
%K 
%R https://doi.org/10.1071/ASEG2006AB018
%U https://www.publish.csiro.au/paper/ASEG2006AB018 
%X In seismic reflection tomography, the velocity model of the subsurface is updated by back-projecting travel-time residuals along ray-paths. The travel-time residuals are picked from the seismic data itself and the methodology used to gather these picks is a fundamental part of any velocity inversion workflow. In particular, the density at which the residuals are represented in the four-dimensional data space (inline, crossline, offset and depth/time) appears to have a significant effect on the precision of the velocity updates that are output from the tomographic inversion. Utilising dense, hyperbolic- (or parabolic-) fitting means that the residuals are finely sampled in the data space but does not necessarily represent their true values with great accuracy. Dense, non-hyperbolic fitting offers a similarly fine sampling but with greater adherence to the true residual value. These two methodologies have been compared and contrasted on a complex synthetic dataset. It can be seen from this comparison that the dense, non-hyperbolic tomography offers greater potential for resolving small-scale velocity heterogeneities in the Earth. 
