Slope Failure Assessment By 3-D Response Analysis Techniques in Seismic Microzonation

Abstract eng:
Seismic micro-zoning techniques have been used frequently to estimate earthquake damages and to develop earthquake disaster reduction plans. This paper focuses on earthquake-induced slope failures and reviews risk assessment methods by earthquake-induced slope failures metrics table. A new method of risk assessment for earthquake-induced slope failures is introduced. This method consists of 3D-FEM response analysis. Two methods are used to calculate seismic motion of the active fault associated with the 2000 Tottori-Ken-Seibu Earthquake. Seismic motion calculations are carried out with the usual seismic micro-zoning technique and compared to the proposed 3D-FEM response analysis by BESSRA (Bird’s-Eyeviewed Slope analysis for Seismic Risk Assessment). Our proposed method integrates slope analysis by BESSRA with the instrumental seismic intensity delivered from seismic micro-zoning technique. It allows 1D micro-zoning seismic motion calculations to take into account 3D topographic effects. Modified instrumental seismic intensity including integrated 3D topographic effect delivered from the method is then adapted to the earthquake-induced slope failures metrics table, and risk assessment of earthquake-induced slope failures is improved with the proposed methodology.

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