1. Department of Resources Engineering, National Cheng Kung University, No. 1 University Road, Tainan City 70101, Taiwan
2. Graduate Institute of Applied Geology, National Central University, No. 300 Jhongda Road, Jhongli City 32001, Taiwan
3. Graduate Institute of Geophysics, National Central University, No. 300 Jhongda Road, Jhongli City 32001, Taiwan
4. Geotechnical Engineering Research Center, Sinotech Engineering Consultants, Inc., Taipei 110, Taiwan