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Assessment of Earthquake Induced Landslide Susceptibility with Variation of Groundwater Level

지하수위 변화에 따른 지진 유발 산사태의 취약섬 분석

  • 김지석 (한국전력기술주식회사) ;
  • 박혁진 (세종대학교 지구정보공학과) ;
  • 이정현 (세종대학교 지구정보공학과)
  • Received : 2011.06.09
  • Accepted : 2011.08.09
  • Published : 2011.08.28

Abstract

Since the frequency of the earthquake occurrence in Korean peninsular is continuously increasing, the possibility that massive landslides are triggered by earthquake is also growing in Korea. Previously, the landslide is known to be induced by large magnitude earthquake, whose magnitude is larger than 6.0. However, the landslide can be induced by only small magnitude earthquake, especially in the fully saturated soil. Therefore, the susceptibility of landslide caused by small magnitude earthquake in fully saturated soil is analyzed in this study. For that, the topographical and geological characteristics of the site were obtained and managed by GIS software. In the procedure of the study, slope angle, cohesion, friction angle, unit weight of soil were obtained and constructed as a spatial database layer. Combining these data sets in a dynamic model based on Newmark's displacement analysis, the landslide displacements were estimated in each grid cell. In order to check out the possibility of the earthquake induced landslides, the level of the groundwater table is varied from dry to 80% saturated soil. In addition, in order to analyze the effect of the magnitude of earthquake and distance to epicenter, four different earthquakes epicenters were considered in the study area.

Keywords

Newmark model;GIS;Landslides;Probability of landslides;critical acceleration

Acknowledgement

Supported by : 한국연구재단

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