Incorporating an electro-magnetic view into a hydrological study on shallow landslide prediction - Laboratory experiments focused on soil displacement and subsequent shallow landslide initiation induced by rainfalls -

Understanding the mechanism of precursors related to shallow landslides, such as small soil displacement occurring commonly prior to shallow landslide initiation, must be useful to advance a predictive accuracy of shallow landslide initiation and mitigate subsequent sediment disasters. The small soil displacement, so called soil creep which is well-known empirically as an indication of shallow landslide initiation, was focused on understanding the effect of subsurface hydrology on soil displacement and shallow landslide initiation. Soil displacement, pore water pressures, and self potential, which occurred prior to shallow landslides, were measured in two flume experiments consisted of an artificial sandy slope of 9 m long, 1 m wide, 0.7 m deep, and the slope of 32 degrees with the rainfall intensities of 100 and 80 mm/h. Following 4 findings were obtained.