1. National Oceanography Centre; University of Southampton Waterfront Campus; European Way Southampton SO14 3ZH U.K.
2. School of Geosciences; The University of Edinburgh; Grant Institute; The King's Buildings, West Mains Road Edinburgh EH9 3JW U.K.
3. Edinburgh Anisotropy Project; British Geological Survey; Murchison House, West Mains Road Edinburgh EH9 3LA U.K.