Acknowledgements

I would like to thank Keith Kvenvolden, Myung Lee and Bill Dillon from the USGS for providing us with a copy of the seismic data used in this study. Originally, a significant part of this analysis was performed in collaboration with David Lumley. I would like to thank him for many helpful discussions and suggestions. Furthermore, I would like to thank him for the permission to use his prestack migration code as described in section 2.4.2.