A joint survey team from Japan conducted a disaster survey on the 2010 Chilean Earthquake and Tsunami from April 23 to 30. This is a brief report of the survey. The survey has two objectives. The first one is to accurately describe the disaster in coastal areas in order to use such knowledge to predict and protect against future tsunami disasters. The second objective is to enhance the cooperative relationship between Chile and Japan on disaster mitigation measures. Major results of the survey are as follows:
　1) Huge tsunami inundation heights were measured in the surveys: very high at Robinson Crusoe Island (6-16 m), very high at Dichato and Talcahuano (6-9 m), and moderate at Valdivia (1-2 m). The maximum height occurred not with the first wave but the 3-5th waves. The tsunami inundation height changes significantly depending on the topography (for example, the south beach of Talcahuano (San Vicente Bay) is very low compared with that on the north side of Talcahuano (Concepcion Bay.) It should be noted that these are not unusual features of tsunamis.
　2) Although the tsunami was huge, the casualties were relatively small compared with previous tsunami disasters since many people evacuated after the earthquake. Sixteen people were killed on Robinson Crusoe Island; it was difficult to transmit the warning as the earthquake occurred during the night.
　3) Similar devastating damages to those in previous tsunami disasters were found in the surveys. For example, almost all the houses were washed away where the tsunami height exceeded 8 m and about 50% of the houses were damaged by a tsunami of 4 m. Wooden houses were very weak and reinforced concrete buildings were relatively strong.
　4) Talcahuano port was damaged significantly. Nearly 700 containers were washed away causing secondary damages by their drifting. Many ships were also damaged. The quay walls were severely damaged by earthquake shaking. Early recovery of the port and industry areas near the port is vital for the economic recovery of the areas around Concepcion.
　5) The workshop was very successful and future cooperation on the development of disaster mitigation measures including dissemination of tsunami knowledge was discussed in the meetings.