Consideration of Surface Information Extraction Method for Disaster Prevention using ALOS PALSAR Interferometry

The first object of this study is to consider ground surface displacements that occurred due to Philippine Sea Plate movements in the adjacent area of Huatung Valley in Taiwan. In order to clarify the activity of Crustal Deformation in this area, we have previously performed repeat-pass Differential SAR Interferometry (D-InSAR) to estimate and then evaluate the displacement values by geodetic levelling measurements. According to these previous results using successful ENVISAT/ASAR data, the displacement values ranged between -1.5 cm and +2.8 cm, which coincide on the active fault area. In order to confirm these obtained results, we are expecting to acquire and more detail processing of L-band ALOS/PALSAR interferograms. The second object of this study is aiming to apply the Triherence method developed by ENVISAT/ASAR data to generate the stable phase points to extract the small hazardous area of landslides. According to previous results, varying of stable phase point number that indicates the tiny deformation caused by the existence of landslide precursor. We plan to develop new Triherence method using ALOS/PALSAR data to apply landslide areas in Taiwan, Malaysia and Japan. Finally, we plan to compare with GPS displacements at the hazardous areas. This is the step to obtain ground surface hazardous map by comparing several geophysical data such as Earthquake Epicenters, GPS surveys, EDM surveys and Seismic Exploration Survey. Using above related Earth's Surface Deformation Information, we plan to extract effective and useful information for disaster prevention and mitigation.