NH3.6

Mechanisms of landslides under seismic and rainstorm conditions
Convener: Hiroshi Fukuoka  | Co-Conveners: Irasema Alcántara-Ayala , Ogbonnaya Igwe 
Poster Programme
 / Attendance Fri, 07 May, 10:30–12:00  / Halls X/Y
Earthquakes and rainstorms are most common triggers of landslides. Rapid and long runout landslides induced by those often claims casualties. Slow landslides have been giving serious damage to infrastructures and properties. This session aims to present contributions dealing with mechanisms causing rapid and slow landslides induced by earthquakes and rainstorms.
- Landslides under seismic condition
One of the most probable factors to cause rapid landslides might be quick reduction of shear resistance during ground motion. Slow landslides are less, and usually occur at post-earthquake rainstorm condition. This session welcomes various mechanism studies from the aspects of soil / rock mechanics, engineering geology including weathering, geomorphology, seismology including seismic response in the slopes, hydrology including groundwater penetration and (excess-) pore pressure generation. Combined effect of antecedent precipitation before earthquake is also a key topic.
- Landslides under rainstorm condition
Heavy rainfall often causes both rapid and slow landslides. Rain water penetrates into ground and makes groundwater rise, causing slope instability by reducing effective stress. This session welcomes contributions on recent developments in the mechanics of inducing and maintaining slow landslides movement, as well as prossible impacts of environmental, and most notably climate, change.
- Models of landslide hazard assessment
Regional and global scale monitoring of precipitation based on ground-based radar network and satellite sensors enables wide area landslide prediction and early warning, especially when combined with regional / global databases of various geophysical properties. Meanwhile, field observations, laboratory experiments, and numerical simulation have provided various insights into landslide dynamics. This session will present papers focusing on empirical, probabilistic or hydrological models of landslide triggered by rainfall, and prediction of landslide site, size and time of the final failure, as well as assessment of the runout area, as most important targets for hazard and risk mitigation.