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Several studies have been conducted on developing an early warning system using rainfall and landslide histories. These studies only consider rainfall as a parameter and do not consider the effects of local geology, hydrology and topography which varies spatially and are critical for an early warning system. The paper presents a simple monitoring system using Micro electro mechanical systems (MEMS) tilt sensor and volumetric water content sensor instead of traditional instruments like extensometers and inclinometers. The MEMS-based sensor monitors the tilting angle of the sensor fixed at shallow depths and the variation in the tilting angle corresponds to the lateral displacement at the slope surface. Hence, the rate of tilting angle that surpasses a particular value implies an imminent slope failure. It is recommended that a precautionary measure for slope failure be issued at a tilting rate of 0.01°/h and warning of slope failure issued at a rate of 0.1°/h. The MEMS based tilting sensors are inexpensive and therefore it is imperative to install several low-cost sensors over an unstable slope to determine the failure section during the next rainfall event. This paper is an application of the technology in Chibo region of Kalimpong district in Darjeeling Himalayas which has been monitoring the region since June 2017. The system would help in developing an early warning system with an objective to save human lives.
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