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Urban Near‐Surface Seismic Monitoring Using Distributed Acoustic Sensing
Author(s) -
Fang Gang,
Li Yunyue Elita,
Zhao Yumin,
Martin Eileen R.
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl086115
Subject(s) - geology , remote sensing , geophone , seismology , temporal resolution , passive seismic , ambient noise level , intrusion , distributed acoustic sensing , environmental science , fiber optic sensor , computer science , optical fiber , telecommunications , sound (geography) , physics , geochemistry , quantum mechanics , geomorphology
Urban subsurface monitoring requires high temporal‐spatial resolution, low maintenance cost, and minimal intrusion to nearby life. Distributed acoustic sensing (DAS), in contrast to conventional station‐based sensing technology, has the potential to provide a passive seismic solution to urban monitoring requirements. Based on data recorded by the Stanford Fiber Optic Seismic Observatory, we demonstrate that near‐surface velocity changes induced by the excavation of a basement construction can be monitored using existing fiber optic infrastructure in a noisy urban environment. To achieve satisfactory results, careful signal processing comprising of noise removal and source signature normalization are applied to raw DAS recordings. Repeated blast signals from quarry sites provide free, unidirectional, and near‐impulsive sources for periodic urban seismic monitoring, which are essential for increasing the temporal resolution of passive seismic methods. Our study suggests that DAS will likely play an important role in urban subsurface monitoring.