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C. Avenue and . Guillemin, 45060 Orléans -Cedex 02, France E-mail: y.thiery@brgm.fr Rosalie Vandromme French Geological Survey, Risk and Disaster Prevention Division, p.3

C. Avenue and . Guillemin, 45060 Orléans -Cedex 02, France E-mail: r.vandromme@brgm.fr Olivier Maquaire LETG-Caen Géophen UMR 6554 CNRS, mail: olivier.maquaire@unicaen.fr Séverine Bernardie French Geological Survey, Risk and Disaster Prevention Division, p.3

C. Avenue and . Guillemin, 45060 Orléans -Cedex 02, France E-mail: s.bernardie@brgm