1. Department of Civil Engineering, School of Engineering, University of Birmingham, Birmingham, UK
2. Geophysics, RSK Environment Ltd, Hemel Hempstead, UK
3. Geoscience and Engineering, RSK Environment Ltd, Hemel Hempstead, UK
4. Geomatrix Earth Science Ltd, Leighton Buzzard, UK
5. BT Optical Network Research, Ipswich, UK
6. BT Optical Networks Research, Ipswich, UK