The Chi-Chi, Taiwan earthquake with a magnitude of 7.3 occurred on September 21, 1999. It was the largest and most damaging earthquake in Taiwan in a century. It induced extensive geotechnical hazards including landslides, soil liquefaction, foundation failures, and ground movements in central Taiwan, and caused substantial damages to buildings, roadways, bridges, and waterfront structures. Field investigations and studies in geotechnical aspects, including landslides, soil liquefaction, foundations, retaining structures, dams and tunnels, in the affected areas were performed. The results of field explorations and laboratory tests for the study of soil liquefaction and evaluation of the secondary hazard of debris flow are also discussed
