In the airport where various facilities are installed, it is feared that their function will be suspended when the ground in airport site is liquefied by large earthquake. Especially, runway pavement of which performance needs bearing capacity and keeping allowable surface deformation after an earthquake, will be damaged due to differential settlements with deformation of the ground induced by liquefaction. In this case, it is thought that there is a possibility to stop the present serviceability of runway even if damage to runway pavement structure is locally caused by liquefaction. This paper describes investigations to estimate damages to runway pavement ground induced by liquefaction using geophysical exploration which were used as a technique for an interpolation of the existing geological information.