Funding for this research was provided by the U.S. Geological Survey Coastal and Marine Geology Program, the Office of Naval Research (ONR), and the Optics Acoustics and Stress In Situ (OASIS) project. Assistance in the field was provided by Charles Worley, Emile Bergeron, Brian Buczkowski, Elizabeth Pendleton, and Bené Ferré of the USGS and the captain and crew of the Megan T. Miller. This report benefited from reviews by Elizabeth Pendleton, Seth Ackerman, and VeeAnn Cross.