We are grateful to the Ocean Drilling Program for inviting us to participate on Leg 165, to all members of the Shipboard Scientific Party of Leg 165 for their cooperation on board the ship, and to the ODP personnel and the Sedco crew, who made Leg 165 a success. JOI/USSAC provided support for the first author. We thank Patty Ganey at UTIG for supplying MCS data. We also thank Cristina Broglia for insights into log processing and Dr. Sun, at the Borehole Research Group, LDEO, for supplying software for synthetic seismogram calculations.