1. Professor in the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91125.
2. Professor in the Geophysics Program, University of Washington, Seattle 98195.
3. Professor in the Geophysical Institute, University of Alaska, Fairbanks 99701.
4. Senior research fellow in the Institut für Geophysik, Westfalische Wilhelms-Universität,& Münster, Federal Republic of Germany.
5. Research fellow California Institute of Technology.
6. Graduate student at California Institute of Technology.
7. Graduate students at the University of Washington.