f Presentation and discussion of tomographic inversions of crosswell surveys at Sellafield

This paper presents the crosswell seismic tomographic processing and imaging of two data sets acquired for UK Nirex Ltd. in the Sellafield area of Cumbria, England as part of the ongoing geological investigations of the area. The objectives of the study were to better characterise the acoustic properties of the rock mass between the boreholes and address key uncertainties in the understanding of the geological structure.