1. Departments of Geology and Geophysics, University of Hawaii, Honolulu, Hawaii.
2. Department of Environmental Sciences, University of California, Riverside, California.
3. National Energy Authority and Science Institute, University of Iceland, Reykjavik, Iceland.
4. Departments of Oceanography, University of Hawaii, Honolulu, Hawaii.
5. Present address: Department of Earth Sciences, Montana State University, Bozeman, Montana.