Anomalous Displacement Detection of Bridges Using Satellite SAR: A Case Study on a Collapse of Musota Water Pipe Bridge

This paper proposes a method for anomaly detection of bridge deflections using satellite Synthetic Aperture Radar (SAR). The proposed method has the following three features: (1) acquire bridge displacement data for multiple spans simultaneously using SAR technology, (2) estimate features representing the shape and size of displacement, and (3) detect anomalous displacement in a bridge by analyzing the estimated multiple features statistically.This paper describes the results of the practical application of the proposed method to MUSOTA water pipe bridge in Japan, which collapsed on October 3, 2021.