Affiliation: | VIEPS Department of Earth Sciences, Monash University, Clayton, VIC 3800,;Australia Department of Geology and Geophysics, University of Adelaide, Adelaide, SA 5005,;Australia Now at: CTBTO PrepCom, IDC/Scientific Methods, Vienna International Centre, PO Box 1200, A-1400 Vienna, Austria. E-mail: Now at: School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK.E-mail: |