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Landslide disasters often cause huge property losses and casualties. Therefore, distributed real-time landslide deformation monitoring is of great significance to ensure the safety of people’s lives and property, and the stability evaluation of landslide. Ultra-weak fiber Bragg grating (UWFBG) sensing technology can realize the measurement distance of 20 km for single optical fiber, and the single measurement time is less than 1 s. Therefore, it has the potential of distributed realtime monitoring. In this work, a novel distributed real-time landslide deformation monitoring method based on UWFBG was proposed. And this method was applied to a real landslide in Yibin City, Sichuan Province, China, to monitor its deformation in situ. The feasibility of the monitoring method was verified and the landslide deformation was analyzed. The in-situ monitoring results show that on the time scale, the local deformation of the landslide is gradually increasing; on the spatial scale, there are some points with large local deformation, but the overall deformation in the monitoring area is small. The monitored results also suggest that the landslide is in a stable state during the monitoring period.
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