The authors will like to thank the Sedco and ODP staff of Leg 176 for their hard work and dedication. Dr. David Goldberg (LDEO) and Dr. Gilles Guerin (LDEO) provided many insightful discussions on the subject of physical properties of crystalline rocks. Mr. Howard Glassman (Baker-Atlas) and Mr. Doug Patterson (Baker-Atlas) provided their time and facilities for guiding Dr. Iturrino in the processing of the DSI data. Dr. Roy Wilkins, Dr. Richard Von Herzen, and an anonymous reviewer improved the quality of this manuscript with their invaluable comments. This research used samples provided by the Ocean Drilling Program (ODP). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. Funding for this research was provided by a USSSP Site Augmentation proposal (OCE-9320477) and a postcruise USSSP proposal (#F000779).