1. School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang 222005, China
2. Badong National Observation and Research Station of Geohazards, China University of Geosciences, Wuhan 430074, China
3. Jiangsu Institute of Marine Resources Development, Lianyungang 222005, China
4. Department of Earth Resources Engineering, Faculty of the Engineering, Kyushu University, Fukuoka 819-0395, Japan