Pressure Head Dynamics on a Natural Slope in Eastern Iburi Struck by the 2018 Hokkaido Earthquake

摘要: The 2018 Hokkaido Eastern Iburi Earthquake triggered numerous shallow landslides on slopes covered with thick pyroclastic fall deposits. These tended to occur concave rather than convex and their slip surfaces were very wet, indicating that water played an important role in landslide initiation. As a first step toward clarifying the of these landslides, we used tensiometers monitor pressure head dynamics natural hillside deposits remained place throughout earthquake. We found slopes, lower part weathered basement complex (sedimentary rock) always wet. Notably, interface between complex, which forms potential surface for earthquake-induced was at or near saturation. On never saturated showed greater fluctuation. infer over tend weather more easily are susceptible intense ground motion timing earthquake slopes. conclude factors contributed larger number initiated