PSInSAR技術の非都市部地表面変動計測への適用

抄録

PSInSAR technique was applied to non-urbanized area in Japan to monitor the land deformation caused by earthquakes, volcanic activities, land slides, and so on. PSInSAR technique has been developed to monitor the land subsidence over urbanized area. In Japan, however, to monitor land deformations over non-urbanized area are often required. In this paper, after the principles of PSInSAR technique are explained, PSInSAR study for Tokai earthquake risk assessment is described. This was a joint research project for ESA. PSInSAR technique monitors the 2-dimensional distribution of land deformation as the time series. These results are useful to estimate the underground structure around Tokai area.
Before PSInSAR technique is applied to real projects, the feasibility of the study should be evaluated. Several conditions and limitations for PSInSAR were studied in this paper and two methods were proposed to evaluate the PS density-feasibility of PSInSAR. The PSInSAR feasibility of the area along Riv. Kakkonda near to Mt. Iwate was evaluated by the proposed two methods. PSInSAR study was then applied to the area and showed that the feasibility study was enough adequate. PSInSAR study around the area also showed the land deformation caused by an earthquake clearly and revealed the location of the active faults near the surface.