It is important to grasp the damaged areas and situations caused by large-scale natural disaster as soon as possible for the quick response in order to help people in the area. In this regard, satellite remote sensing which can observe wide area at once is effective method, especially, Synthetic Aperture Radar (SAR) which can observe at night time and rainy day is more effective to grasp the situations of the damage. Generally, the locations are determined by subtracting the SAR image that was observed before the disaster, “before-event-image”, from that observed after the disaster, “after-event-image”.
 In this study, however, we tried to detect the locations of slope failure areas by using only “after-event-image” of ALOS-2/PALSAR-2. We analyzed twenty-eight areas where slope failures occurred due to heavy rain in Hiroshima prefecture, and found that it is possible to detect the slope failures by using only “after-event-image” of SAR.

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 Reliability design is being generally used today, it is required to check the earthquake safety assurance of the airport civil engineering facilities by means of an index based on probability theory. However, the discussion on the target safety level (limit value) such as damage probability and reliability index has not been deepened and, it is an issue in introducing reliability design. It is thought that the limit value has an aspects of social agreement matter as well as scientific rationality. Therefore, it is necessary to clarify the interpretation of administrative law for the public facilities and the location of the defect liability in occurrence disaster. Since the airport civil engineering facilities are elements constituting the airport function, its limit value needs to be evaluated based on a certain rationality from the limit value of the performance requirements of the entire airport.
 In this paper, we survey not only administrative law such as Basic Act on Disaster Control Measures and State Redress Act but related judicial precedents, then we study legal basis about the limit value setting. A method to evaluate the limit value of the airport civil engineering facilities from the limit value of the entire airport is proposed. In addition, a code calibration of sample airport is carried out as the verification of applicability of the proposed method.

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