Chia-Han Tseng, National Central University, Graduate Institute of Applied Geology, Taoyuan, Taiwan, Ruey-Juin Rau, Natl Cheng-Kung University, Department of Earth Sciences, Tainan, Taiwan, Ching-Jiang Jeng, Huafan University, Department of Landscape Architecture and Environmental Design, New Taipei City, Taiwan and Yu-Chang Chan, Institute of Earth Sciences Academia Sinica, Taipei, Taiwan