1. Staff Scientist., Earth Sciences Div., Lawrence Berkeley Lab., Univ. of California, Berkeley, Calif.; formerly, Post Grad. Student, Dept. of Civ. and Systems Engrg., James Cook Univ. of North Queensland, QLD. 4811, Australia
2. Sr. Lect., Dept. of Civ. and Systems Engrg., James Cook Univ. of North Queensland, QLD. 4811, Australia