Detection of 2011 off the Pacific Coast of Tohoku Earthquake-Induced Landslide Deformation Using InSAR
Many researchers have reported the landslide triggered by the 2011 off the Pacific coast of Tohoku earthquake. However, these reports are mainly based on field surveys and interpretation of aerial photographs. In this study, we try to detect and analyze earthquake-induced landslide deformations from InSAR (synthetic aperture radar interferometry) images using Advanced Land Observing Satellite (ALOS)/Phased-array L band SAR (PALSAR) data. We explain this method of landslide detection and introduce examples of detected landslides. It is thought that these landslides do not cause serious, rapid damage because they caused only minor displacement. However, continual monitoring of detected landslides using InSAR is important to prepare for possible landslide reactivation caused not only by an earthquake but also by snowmelt and heavy rainfall.
KeywordsTohoku Earthquake SAR Landslide ALOS PALSAR
Prof. M Murakami (Hokkaido Univ) indicated and inferred the landslide deformation sites by InSAR processing. Dr. T Inokuchi (NIED) pointed out the location of the Hanayama Caldera in the south Kurikoma area. The PALSAR data used in this study were provided by the Japan Aerospace Exploration Agency (JAXA). The Ministry of Economy, Trade and Industry (METI) and JAXA retains the ownership of the original SAR data. We are thankful to JAXA and METI.
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