| Abstract: | This paper describes a field evaluation of an algebraic reconstruction technique for the tomographic imaging of sub-surface velocity anomalies. We describe the construction of a three-dimensional concrete model and the acquisition and processing of seismic traveltime data through the model. Image reconstructions of the data sets, using an algebraic reconstruction technique and incorporating prior knowledge are presented and these are compared with the actual model. Reconstructions show that it is essential that accurate data are obtained as we demonstrate that relatively small errors in the traveltime data can seriously degrade the reconstruction. We also show that raypath effects are very important limiting factors to the analysis. |
