[H-DS25] Geohazards in humid, tectonically active countries and their precursors

[HDS25-06] Detection of landslide triggered by 2014 North Nagano Prefecture earthquake using ALOS-2/PALSAR-2 InSAR image

*Hiroshi, P. SATO¹, Hidetoshi NAKAJIMA² (1.College of Humanities and Sciences, Nihon University, 2.Geography and Crustal Dynamics Research Center,Geospatial Information Authority of Japan)

Keywords:earthquake, landslide, SAR, ALOS-2, PALSAR-2

InSAR image was produced from HH-polarized ALOS-2/PALSAR-2 data measured on 2 Oct 2014 and 27 Nov 2014, then superimposed by landslide distribution map (National Institute for Earth Science and Disaster, 2000). As a result, it was difficult to identify the surface deformation of Happo-iwa landslide and Kakurezawa landslide (Komatsubara et al., 2015) triggered by 2014 North Nagano Prefecture earthquake; however, the image inferred the subtle amount of deformation on no-landslide slope near Shimizu-yama.




Acknowledgement
Software RINC 0.27 developed by Dr.Ozawa, National Institute for Earth Science and Disaster was used in producing InSAR image.


References
Komatsubara et al., 2015, Landslide in Nakaya district, Otari Village and lateral spread in Horinouchi district, Hakuba Village triggered by North Nagano Prefecture earthquake (M=6.7) on 22 Nov 2014, Journal of the Japan Landslide Society (in press).
National Institute for Earth Science and Disaster Prevention, 2000, landslide distribution map database.
Ozawa T, 2014, Development of InSAR analysis tool in National Institute for Earth Science and Disaster Prevention (series 3), JPGU2014, STT59-P12.