1. Assistant Professor, Dept. of Civil Engineering, Indian Institute of Science, Bangalore 560 012, India. E-mail: muddu@civil.iisc.ernet.in
2. Postdoctoral Fellow, Dept. of Civil Engineering, Queens Univ., Kingston ON, Canada K7L 3N6. E-mail: suresh@ce.queensu.ca
3. Assistant Professor, Dept. of Mining and Geological Engineering, Univ. of Alaska, Fairbanks, P.O. Box 755800, Fairbanks, AK 99775-5800 (Corresponding author). E-mail: ffdm1@uaf.edu.