SEGJ Technical Conference

Surface wave analysis using DAS(Distributed Acoustic Sensor) in active and passive method

Abstract The effectiveness of fiber optic distributed acoustic sensor (DAS) technology as an alert system to detect failures in social infrastructure, such as roads, embankments, and tunnels, was analyzed via surface wave analysis. The DAS measurements underwent 5-m averaging, therefore,raw DAS data cannot be used for phase velocity analyses of shallow structures. However, seismic interferometry results show that cross-correlation functions (CCFs) of the DAS record exhibit high signal-to-noise (S/N) ratios. These dispersion curve images are consistent with the results of conventional surface wave methods. This result suggests that the application of CCFs to the DAS data is an effective method to detect surface waves for infrastructure monitoring.