The Aitape Earthquake (M=7.1), Papua New Guinea on July 17, 1998, generated the tsunami attack along the coastline west side of Aitape. The maximum tsunami run-up height was 10 to 15m in the Arop and Warapu villages located on the sand spits at the mouth of the Sissano Lagoon. The tsunami induced the tremendous damages and killed 2,202 people. The survivors in the damaged villages were relocated to the newly constructed villages away from the shoreline of the lagoon. From Sep.15, 1999, a special team was dispatched to the remote villages to give the information on the scientific explanation of the generation mechanism and energy concentration of the tsunami to the lagoon area. This paper describes the activities and results of the team in the Aitape region. The effective methods to rebuild and to maintain the relocated villages is discussed, and the warning system applied to the local area with no electricity is suggested.
　Numerical tsunami simulation is carried out with an assumption of initial landslide with the volume calculated for the area of 5 km by 5 km and the depth of 20m. The estimated tsunami run-up heights agree with the height distribution obtained in the field survey.