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SLOPE COLLAPSE, SURFACE DEFORMATION AND GROWTH OF ACTIVE FOLD BY THE NIIGATAKEN CHUETSU-OKI EARTHQUAKE IN 2007, CHUETSU DISTRICT, CENTRAL JAPAN

M. Koarai, H. Une, H. P. Sato

First published: 2008DOI pendingView metrics

Abstract

Interferometric analysis of Synthetic Aperture Radar (InSAR) on the Advanced Land Observation Satellite (ALOS PALSAR) shows the spatial pattern of the deformation associated with the magnitude 6.8 Niigataken Chuetsu-oki Earthquake of 26th July, 2007. It reveals not only the large deformation near the source area of the earthquake, but also the local zonal uplift area with 1.5km-wide and 15km-long band along the anticline axis of active fold, on Nishiyama Hill at 15km east of the earthquake epicenter. We consider it is a direct evidence for episodic growth of active fold triggered by the earthquake. In addition, it shows non-seismic ground deformation such as soil liquefaction and lateral soil flow in the center of Kashiwazaki City. In this paper, the authors explain the relationship between land condition and actual damages such as building damage, liquefaction phenomena and slope collapse. The heavily damaged buildings are concentrated in central area of Kashiwazaki City which is located on the ridge of sand dune.

Publication details

Title
SLOPE COLLAPSE, SURFACE DEFORMATION AND GROWTH OF ACTIVE FOLD BY THE NIIGATAKEN CHUETSU-OKI EARTHQUAKE IN 2007, CHUETSU DISTRICT, CENTRAL JAPAN
Authors
M. Koarai, H. Une, H. P. Sato
Proceedings
8th International Scientific Conference - SGEM2008
Publisher
SGEM Scientific GeoConference
Year
2008
Pages
469-476
SWS Citekey
Koarai2008469476
ISSN
1314-2704
ISBN
954-918181-2
Language
en
Publication type
Conference Paper
Keywords
Synthetic Aperture Radar (SAR)active foldslope collapsesurface deformationthe Niigataken Chuetsu-oki Earthquake in 2007
References5

  1. Kobayashi, I., Tateishi,M., Yoshimuma,T., Ueda,T. and Kato,H. Geology of the Kashiwazaki district, Geological Sheet Map at 1:50,000, Geol. Surv. Japan, 102p, 1995.

  2. Sekiguchi, T. and Sato,H.P. Feature and distribution of landslide induced by the Mid Niigata Prefecture Earthquake in 2004, Japan. Jour. Japan Landslide Society, Vol.43, No.3, 2006.

  3. Koarai,M. and Sato,H.P. Slope failures by the 2007 Niigata Prefecture Chuetsu-oki Earthquake. Jour. Geol. Soc. Japan, Vol. 114, No. 1,2008.

  4. Takeuchi,K., Yoshinuma,T. and Kato,H. Geology of the Kakizaki district, Geological Sheet Map at 1:50,000, Geol.Surv.Japan,48p, 1996.

  5. Geographical Survey Institute http://www.gsi.go.jp/WNEW/PRESSRELEASE/2007/1 002.htm , 2008.

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