REVIEW

Review of earthquake-induced landslide modeling and scenario-based application

Giha Lee1   Hyunuk An2   Minho Yeon1   Jun Pyo Seo3   Chang Woo Lee3,*   

1Department of Advanced Science and Technology Convergence, Kyungpook National University, Sangju 37224, Korea
2Department of Agricultural and Rural Engineering, Chungnam National University, Daejeon 34134, Korea
3Division of Forest Disaster Management, National Institute of Forest Science, Seoul 02455, Korea

Abstract

Earthquakes can induce a large number of landslides and cause very serious property damage and human casualties. There are two issues in study on earthquake-induced landslides: (1) slope stability analysis under seismic loading and (2) debris flow run-out analysis. This study aims to review technical studies related to the development and application of earthquake-induced landslide models (seismic slope stability analysis). Moreover, a pilot application of a physics-based slope stability model to Mt. Umyeon, in Seoul, with several earthquake scenarios was conducted to test regional scale seismic landslide mapping. The earthquake-induced landslide simulation model can be categorized into 1) Pseudo-static model, 2) Newmark’s dynamic displacement model and 3) stress-strain model. The Pseudo-static model is preferred for producing seismic landslide hazard maps because it is impossible to verify the dynamic model-based simulation results due to lack of earthquake-induced landslide inventory in Korea. Earthquake scenario-based simulation results show that given dry conditions, unstable slopes begin to occur in parts of upper areas due to the 50-year earthquake magnitude; most of the study area becomes unstable when the earthquake frequency is 200 years. On the other hand, when the soil is in a wet state due to heavy rainfall, many areas are unstable even if no earthquake occurs, and when rainfall and 50-year earthquakes occur simultaneously, most areas appear unstable, as in simulation results based on 100-year earthquakes in dry condition.

Figures & Tables

Fig. 1. Pseudo-static slope stability modeling concept (Zhang, 2012). FOS, factor of safety.