1. Research Assistant, Dept. of Civil Engineering, Univ. of New Mexico, Albuquerque, NM 87131; Senior Civil Engineer, Applied Research Associates, P.O. Box 5388, Albuquerque, NM 87185 (corresponding author).
2. Professor and Regents Lecturer, Dept. of Civil Engineering, Univ. of New Mexico, Albuquerque, NM 87131.
3. Emeritus Professor, Dept. of Mineral Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Pl., Socorro, NM 87801; President, Aimone-Martin Associates, LLC, 1005 Bullock Ave., Socorro NM 87801.