Décès de Claude Froidevaux (1930-2015)

Décès de Claude Froidevaux (1930-2015)

cfroidevauxThe former ‘directeur du département de Géosciences’ Claude Froidevaux died on 11 August 2015 in Paris. Claude Froidevaux was a pioneer in studies of the interplay between physics and tectonics as well as a very dedicated leader in many international associations.

Born in Switzerland in 1930, Claude Froidevaux had rather eclectic interests and skills: after a bachelor in modern history from the University of Lausanne, Switzerland, he switched to physics and obtained a D. Phil. in low temperature physics from the University of Oxford, UK. In 1964, after a postdoc in the University of California at Berkeley, USA, he joined the University of Orsay, France, where he initiated a very successful research group developing experimentation based on nuclear magnetic resonance. At the request of Jacques Friedel and Claude Allègre, he got interested in geosciences in the early seventies. He rapidly developed a novel approach in understanding of mechanical and thermal processes in the mantle, in collaboration with Gerald Schubert and other scientists from the University of California at Los Angeles, where he spent a sabbatical.

At a time when plate tectonics was still a new concept, Claude was among the first to introduce physics to explain the Earth’s deformations occurring on both microscopic and macroscopic scales. Linking thermodynamics, rheology, solid-state physics and dynamics, he developed mechanical models of the lithosphere and the upper mantle, which had a profound influence on the early developments of modern geodynamics. Claude Froidevaux was very good at attracting and motivating young scientists, who benefited from his clear physical vision of Earth sciences. On his return to Orsay he, with George Jobert at Paris VI and Kurt Lambeck at Paris VII, was instrumental in developing the joint DEA (or Masters) program that was influential in training the next generation of researchers. At Orsay he created very fruitful working conditions for his team, and the ‘Froidevaux group’ in Orsay was a kind of scientific family.

In 1986, Xavier Le Pichon asked Claude Froidevaux and his team to join the Ecole Normale Supérieure (ENS) in Paris, where he became ‘Directeur du département de géosciences’.

Claude Froidevaux was a very prominent personality of international geosciences. He was among the scientists who promoted the European Union of Geosciences (EUG), a predecessor of the European Geosciences Union (EGU), as Editor of the Terra Cognita journal. In 1995 he was elected President of the International Association of Seismology and Physics of the Earth’s Interior (IASPEI). Many of us keep marvelous memories from the summer schools he organized in Cargese and Porto-Heli and from the Conference on Mathematical Geophysics in southern France.

Claude had a genuine interest both in people and in science even in domains rather far away from his own field. This prompted him to help many, especially earlier career scientists. Claude will be remembered as an optimistic, enthusiastic, and generous personality.

Luce Fleitout and Henri-Claude Nataf