Acknowledgments

The authors thank the captain and crew of the motor vessel Scarlett Isabella and the research vessel Shearwater for their cooperation during the marine geophysical data acquisition. William Danforth, Charles Worley, Eric Moore, Seth Ackerman, and Alex Nichols, all with the U.S. Geological Survey, provided technical support at sea. Andrea Toran of the U.S. Geological Survey was extremely helpful in the publication of this report. The authors thank John Warner and David Foster of the U.S. Geological Survey for their helpful reviews of this manuscript.