Abstract
Monitoring and early warning is one of the most effective methods toward reduction of accident induced by landslide and slope failure during rainfall. The traditional methods such as extensometers and bore-hole inclinometers are common monitoring ways, but the traditional equipment is expensive and not easy to install in field site. The authors have developed wireless sensor units with Micro Electro Mechanical Systems (MEMS) tilt sensor and volumetric water content sensor and proposed an early warning system as one of more feasible countermeasures to avoid slope failure accident. The warning system including developed tilt sensor unit, has been deployed in several actual slopes for validation and verification of field performance in Japan.
