In response to the occurrence of the 2016 Kumamoto earthquake sequence, the National Institute for Land and Infrastructure Management and the Port and Airport Research Institute dispatched four reconnaissance teams to the affected area, with the cooperation of the Kyushu Regional Development Bureau, to investigate damage to port and airport facilities. This report presents the results of the reconnaissance activities by the teams. In addition, the report includes relevant information provided by regional authorities. The report also presents strong motion records and estimated ground motions at the ports and airports. In contrast to serious damage to some infrastructures, the damage to port and airport facilities was found to be generally minor. However, the teams did find damage due to the earthquakes, which could be informative for the design of port and airport facilities in the future. A gravity-type quay wall at Kumamoto port suffered only slight damage with the residual horizontal displacement of 12 cm, presumably because of the SCP improved ground with the improvement ratio of 80 % down to the bottom of the alluvial layers. At Kumamoto and Beppu ports, movable bridges for the ferries became out of order, which could be attributed to the deformation of ground. Such cases indicate that, in the design of port facilities, not only the performance of the structure itself but also the performance of soil-structure system should be considered.

Key Words: the 2016 Kumamoto earthquake sequence, port, airport, damage, strong ground motion