Table of Contents
Geography Journal
Volume 2015, Article ID 359047, 11 pages
http://dx.doi.org/10.1155/2015/359047
Review Article

Geotechnical Distinction of Landslides Induced by Near-Field Earthquakes in Niigata, Japan

Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2118, Japan

Received 23 December 2014; Revised 2 March 2015; Accepted 13 March 2015

Academic Editor: Hamid R. Pourghasemi

Copyright © 2015 Hirofumi Toyota and Susumu Takada. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Landslides triggered by near-field earthquakes with epicentres directly beneath towns have attracted intense attention since the 2004 Mid-Niigata (Niigata-ken Chuetsu) Earthquake. Hilly and mountainous areas sustained heavy damage. Social problems developed when many towns became isolated because landslides cut off traffic and public service lifelines. Soil from landslides closed river channels and formed natural dams. The natural dams submerged some towns. Emergency measures were undertaken promptly to prevent debris flows caused by natural dam breaks. Subsequently, the 2007 Mid-Niigata Offshore (Niigata-ken Chuetsu-oki) Earthquake and the 2011 Northern Nagano Earthquake struck the Niigata region. Landslides triggered by those earthquakes differed in terms of their number, scale, and location. Therefore, characteristics of the landslide sites of the respective earthquakes were examined to ascertain their topographical and geological features. Furthermore, differences in groundwater level and damage related to compound disasters were explained for discussion of the stability progress of damaged slopes.