[1] UNIV PARIS 06, DEPT SCI TERRE, F-75230 PARIS 05, FRANCE
[2] UNIV TOKYO, INST GEOPHYS, TOKYO 113, JAPAN
[3] INST PHYS GLOBE PARIS, CNRS, GEOCHIM & COSMOCHIM LAB 196, PARIS, FRANCE
[4] UNIV PARIS 7, DEPT SCI TERRE, F-75230 PARIS, FRANCE
[5] UNIV NICE, GEOL STRUCT LAB, F-06000 NICE, FRANCE