Near-Surface Structure Investigation Using Ambient Noise in the Water Environment Recorded by Fiber-Optic Distributed Acoustic Sensing

Near-surface structure investigation plays an important role in studying shallow active faults and has various engineering applications. Therefore, we developed a near-surface method using ambient noise water environment. This newly seismic acquisition technology, fiber-optic distributed acoustic sensing (DAS), was used to acquire from the Yangtze River. The recorded data were processed reconstruct surface waves based on theory of interferometry. fundamental-mode dispersion curves extracted inverted obtain shear-wave velocity model below DAS line. We compared with subsurface geological information near study area. results consistent prior information. environment can be combined technology effectively investigate structures.