Landslide Surface Deformation Detected by Synthetic Aperture Radar (SAR) Interferometry in Shizu Area on the Southern Foot of Mt. Gassan, ... View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2017

AUTHORS

Hiroshi P. Sato , Akira Suzuki

ABSTRACT

L-band (22.36 cm in wavelength) radars such as ALOS (Advanced Land Observing Satellite)/PALSAR (Phased Array type L-band Synthetic Aperture Radar) are suitable for observing landslide surface deformation in Japan. In this study, we produced InSAR (SAR interferometry) images using PALSAR data and observed the fringes produced; after subtracting orbital and topographic fringes, the resulted fringe indicated a 2 × 1 km landslide surface deformation on the southern foot of Mt. Gassan (stratovolcano, 1,994 m in elevation) in Japan; this landslide is actually a reactivated old landslide. According to a previous study, slide surfaces can be identified both in the deposits and in the underlying mudstone, which has a maximum depth of 160 m from the ground surface. The InSAR image indicated surface deformation at more than half of the L-band wavelength along the LoS (line of sight). Because of the good coherence (0.4–0.6) of the obtained InSAR image, we unwrapped the phase of the InSAR image and obtained a continuous phase. We found that the detected landslide deformation could be separated into two sections: a fluvial erosion-affected section and an upper slope section. In the former section, repeated surface deformation between 0 and 7 cm along the LoS implies the deformation by many sub-slide surfaces. In the latter section, surface deformation along LoS uniformly increased from 2.5 cm at the upper scarp to 13.5 cm at the foot of the slopes; this implies that one large rigid landslide block controls surface deformation. An on-site GPS survey of the fluvial erosion-affected section revealed the landslide’s surface deformation, and the measurement results from the GPS survey show good agreement with the InSAR results. More... »

PAGES

31-44

References to SciGraph publications

Book

TITLE

GIS Landslide

ISBN

978-4-431-54390-9
978-4-431-54391-6

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-4-431-54391-6_3

DOI

http://dx.doi.org/10.1007/978-4-431-54391-6_3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1085424061


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