1. Department of Civil Engineering; Chung Yuan Christian University; No. 200, Chung Pei Road Chung Li 32023 Taiwan
2. Institute of Earth Sciences; Academia Sinica; No. 128, Sec. 2, Academia Road, Nangang Taipei 11529 Taiwan
3. Department of Civil Engineering, and Hydrotech Research Institute; National Taiwan University; No. 1, Sec. 4, Roosevelt Road Taipei 10617 Taiwan