Some important considerations in analysis of earthquake-induced landslides

Abstract

Background: The frequency of landslide disasters is increasing as a result of exploitation of natural resources, deforestation, and greater population vulnerability due to growing urbanization and uncontrolled land-use. Earthquakes are a major triggering factor of landslides, and earthquake-induced landslides pose a major threat to infrastructure and human life. This paper presents the effects of slope angle, soil sensitivity, ground motion orientation, and multidirectional shaking on the results of seismic slope stability analyses. Results: The results show that permanent shear stresses due to sloping ground, strain softening and sensitivity, ground motion orientation, and multidirectional shaking all have a large influence on the permanent displacements estimated from earthquake-induced landslide hazard analyses. Multidirectional shaking also predicts larger excess pore pressures in deep layers than unidirectional shaking. Conclusions: It is important that site investigations provide adequate information to model the correct slope angle and soil sensitivity. The ground motion orientation should be considered and chosen based on the specific needs of a project. Analyses with only one ground motion component could give unconservative results.

Numerical modelling of the seismic response of gentle slopes in Southeastern Brazil

“…The ground surface inclination is the most relevant geometrical parameter for slope stability analysis (Carlton et al, 2016). For the analyses presented in this paper, four model inclinations were studied: level ground (zero degrees), one degree, three degrees, and five degrees, which cover the range of predominant slope angles across the continental slope in the Campos Basin (Figure 2b).…”

“…One of the most important parameters to consider in the study of submarine landslides is the geometry of the seabed (Carlton et al, 2016). Submarine slopes on open continental margins are the result of parallel sedimentation over large areas.…”

Analysis of Earthquake-Triggered Landslides through an Integrated Unmanned Aerial Vehicle-Based Approach: A Case Study from Central Italy

“…In mountainous areas of seismically active regions, where steep rock slopes and deep valleys increase both shear driving forces and seismic amplification, earthquaketriggered landslides (EQTLs) represent one of the most insidious secondary effects of an earthquake [1][2][3]. Their occurrence can provide significant additional damage to land and property, both in the short- [4] and the long-term [5], as well as major landscape modifications, e.g., the creation of landslide river dams [6,7].…”