Urban High-density 3D Ambient Noise Refracted Wave Extraction

Abstract Active-source seismic detection is trapped in complex urban environmental noise and dense housing facilities, so this method is not suitable for urban environment, but the ambient noise method can obtain urban underground medium information at low cost and environmental protection. At the same time, in order to have a more comprehensive understanding of the underground situation, it is necessary to conduct three-dimensional detection of underground structures, arrange three-dimensional measurement lines, and high-density spatial sampling can obtain high-resolution detection results. In terms of ambient noise body wave extraction, the extraction of refracted waves is easier. Therefore, in this experiment, high-density 3D ambient noise refracted wave extraction is carried out for urban environment. In this paper, the refracted wave signal is extracted by cross-correlation of the collected 20-day ambient noise data.