DBPapers

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

AUTHOR/S: M. KOARAI, H. UNE, H. P. SATO
Sunday 1 August 2010 by Libadmin2008

8th International Scientific Conference - SGEM2008, www.sgem.org, SGEM2008 Conference Proceedings/ ISBN: 954-918181-2, June 16-20, 2008, Vol. 2, 469-476 pp

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.

Keywords: slope collapse, surface deformation, active fold, Synthetic Aperture Radar (SAR), the Niigataken Chuetsu-oki Earthquake in 2007