Comparative analysis of spiral fiber DAS data and three-component geophone data for engineering geological exploration

Distributed Acoustic Sensing (DAS) has emerged as a groundbreaking observation technology in seismic exploration, presenting a novel perspective on data acquisition. Despite its widespread adoption, deploying DAS in surface engineering exploration faces notable challenges, especially regarding limitations in signal-to-noise ratio and spatial resolution. We deployed spiral optical fiber and geophones on the surface, collected active-source seismic data under different conditions, and conducted comparative analysis on the data collected by the two methods. By comparing the frequency characteristics of the two datasets and the waveform characteristics in different frequency bands, we have summarized the differences between the data collected by the spiral optical fiber DAS system and the detectors. The final experimental results indicate that Distributed Acoustic Sensing (DAS) technology based on spiral optical fiber can be applied to shallow surface geophysical exploration at the engineering scale.