Distributed fiber‐optic sensing technologies allow for multiscale observatories, with signals measured at evenly spaced locations along their length, and tunable spatial resolution using what's called an interrogator, which contains the laser, optical devices, and processing. Distributed fiber‐optic sensing technologies allow for multiscale observatories, with signals measured at evenly spaced locations along their length, and tunable spatial resolution using what's called an interrogator, which contains the laser, optical devices, and processing. Distributed Fiber Optic Sensing and the Future of Earthquake Hazards Research: Key Results from USGS Field Experiments Andrew J. McGuire, James Atterholt, Theresa Sawi, Clara Yoon, Morgan P. Despite an ever‐growing library of ground‐breaking studies, questions remain about the potential of fiber‐optic sensing technologies as tools for advancing if not revolutionizing earthquake‐hazards‐related research, monitoring, and early warning systems. A working group convened to explore these. The distributed optical fiber sensors (DFOS) are strain, temperature, and vibration monitoring tools characterized by minimal intrusiveness, accuracy, ease of deployment, and the ability to perform measurements with high spatial resolution.