Susan E.Humphris is a Senior Scientist in the Department of Geology and Geophysics and Director of the Earth-Ocean Exploration Institute at Woods Hole Oceanographic Institution. Her research interests include the volcanic and tectonic controls on the distribution and characteristics of hydrothermal activity at mid-ocean ridges, and the geochemistry of rock-water interactions, and the role of the associated hydrothermal fluxes in global geochemical mass balances. She is a member of the American Geophysical Union, and recently served on the NRC Committee to Review the USGS Coastal and Marine Geology Program.

James A.Jackson is a Reader in the Department of Earth Sciences, University of Cambridge. His research interests include active continental deformation on all scales, from individual faults to orogenic belts, in particular: (1) the relation between presently active deformation and the geological development and structural history of older orogenic belts, (2) the detailed relations between seismic faulting at depth and active geomorphology at the surface, and (3) descriptions and models of large scale continental kinematics and dynamics. He has received various awards and scholarships including the Bigsby Medal in 1997 from the Geological Society of London, and has more than 95 publications in refereed international journals. Dr. Jackson received a B.A. in Geology from Cambridge in 1976, and an M.A. and Ph.D. also from Cambridge in 1980.

Eldridge M.Moores is Professor of Geology at the University of California, Davis, and author of several major books on geology. He holds a B.S. from the California Institute of Technology (1959) and a Ph.D. from Princeton University (1963). His research focuses on tectonics and structural geology of mountain belts from Greece to the Sierra Nevada. Dr. Moores was President of the Geological Society of America in 1996. His other honors include the 1988 Geological Society of America Distinguished Service Award, the 1994 Geological Association of Canada Medal, and an honorary D. Sc. in 1997 from the College of Wooster.

Barry E.Parsons is Reader in Geodesy, Department of Earth Sciences, University of Oxford. He has been involved in research on mantle and crustal dynamics for more than 25 years. For the past 15 years, his work has involved geophysical applications of geodetic techniques: the construction of high-resolution marine gravity fields from satellite altimetry

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