Detection of crustal movements due to the 11 April 2011 Fukushima earthquake from SAR images

摘要

The Fukushima Earthquake with Mw7.1 occurred on April 11, 2011 was one of the most damaging induced events of the 2011 Tohoku earthquake with Mw9.0. It caused numerous fault scarps with a maximum displacement of 2.3 m. In this study, two methods were used to detect crustal movements from two different types of SAR images. Firstly, a differential interferometric analysis (DInSAR) was applied to pre- and post-event ALOS/PALSAR data. From the result of DInSAR, the trends of crustal movements in different areas could be grasped. Then an improved pixel-offset method was applied to pre- and post-event TerraSAR-X images. The two-dimensional movements were detected from the displacements of no-changed buildings. Finally, the detected results were compared with the observation data of GPS ground control stations.