1. Geotechnical Research Centre, Dept. of Civil and Environmental Engineering, Univ. of Western Ontario, London, ON, Canada.
2. Geotechnical Research Centre, Dept. of Civil and Environmental Engineering, Univ. of Western Ontario, London, ON, Canada
3. Institute of Earth and Space Exploration and Dept. of Earth Sciences, Univ. of Western Ontario, London, ON, Canada.
4. Institute of Earth and Space Exploration and Dept. of Earth Sciences, Univ. of Western Ontario, London, ON, Canada