Several colleagues at the USGS provided valuable technical support and funding assistance for this project.

From the USGS Coastal and Marine Geology Centers in Santa Cruz and Menlo Park, California, we thank Kurt Rosenberger and Marlene Noble. We also thank Jonathan Borden, Marinna Martini, William Danforth, Michael Bothner, and Dann Blackwood from the USGS Coastal and Marine Geology Center in Woods Hole, Massachusetts. 

We also wish to thank Chris Gryner of the Woods Hole Oceanographic Institute, Woods Hole, Massachusetts, for his time and assistance at the pressure-testing facility.