Large strains built up in soils and rocks along a dislocated seismic fault can trigger post-earthquake disasters such as landslides and debris flows, which can cause long-lasting serious problems for rehabilitations and land conservations. Therefore one of what required of us is to deduce as much hidden signs as possible from observable change of landforms for rational rehabilitation strategies. Recent development of remote sensing technologies has enabled us to detect precise landform changes in the Eulerian space. However the description in the Eulerian coordinate system is to be converted to Lagrangian description of displacements to cope with post-earthquake geo-hazards. In this individual study, two examples are highlighted. One is in Uragara Hamlet, Ojiya City, Niigata prefecture in an active folding zone of low-rise mountain terrain, which was affected by the 2004 Mid-Niigata Prefecture Earthquake. An attempt was made to extract Lagrangian components of displacements from available set of elevation data for Uragara Hamlet. The second case study is from the 2011 Fukushima Prefecture Hamadori Earthquake. This normal-fault type earthquake triggered some landslides and rock falls in Iwaki City, Fukushima Prefecture, and there is a concern that they will grow into a serious problem given frequent aftershocks and heavy rains in summer. Much of effort is thus devoted to compile the current exact landforms as the reference for possible future soil/rock mass movements.