1. Assistant Professor, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong (corresponding author).
2. Graduate Student, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong.
3. Assistant Professor, Dept. of Earth Sciences, Univ. of Hong Kong, Hong Kong.
4. Professor, Dept. of Geosciences, National Taiwan Univ., Taipei 10617, Taiwan.