Non-uniform Fourier Analysis on Active Seismic Data recorded by 
3-component Geophones and the Stanford Fiber Seismic Observatory

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Abstract/Contents

Abstract: A distributed acoustic sensing (DAS) system allows seismologists to record seismic data through optical fibers and provides denser spatial sampling than geophones. Optical fiber cables can be deployed in areas that are difficult to access with geophones, such as under the ocean and in urban areas. Pre-existing telecommunication cables can also be utilized, which can reduce the cost of a project. We conducted active-source seismic experiment on Stanford campus to test the performance of DAS with optical fiber cable installed along an existing conduit used for telecommunication cables. The data we collected are heavily contaminated by surface wave noises. To attenuate these noises, we analyzed filters that utilize two different techniques, regular and Non-equispaced Discrete Fourier Transform. Our study showed that overall the Non-equispaced Discrete Fourier Transform improves signal coherence better than regular Fourier Transform; however, the Non-equispaced Discrete Fourier Transform on DAS data can become unstable when offsets of the data cause instability in matrix inversion.

Type of resource	text
Date created	June 8, 2018

Author	Sawasdee, Paphop Stock
Primary advisor	Biondi, Biondo L.
Degree granting institution	Stanford University, Department of Geophysics

Subject	School of Earth Energy & Environmental Sciences
Subject	Geophysics
Subject	Seismic Processing
Genre	Thesis

Related Publication	Eileen R. Martin, Chris M. Castillo, Steve Cole, Paphop Stock Sawasdee, Siyuan Yuan, Robert Clapp, Martin Karrenbach, Biondo L. Biondi; Seismic monitoring leveraging existing telecom infrastructure at the SDASA: Active, passive, and ambient-noise analysis. The Leading Edge ; 36 (12): 1025–1031. doi: https://doi.org/10.1190/tle36121025.1
Related item	Title Seismic monitoring leveraging existing telecom infrastructure at the SDASA: Active, passive, and ambient-noise analysis
Location	https://purl.stanford.edu/xg208bd5161

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Preferred Citation: Sawasdee, Paphop Stock. (2018). Non-uniform Fourier Analysis on Active Seismic Data recorded by
3-component Geophones and the Stanford Fiber Seismic Observatory. Stanford Digital Repository. Available at: https://purl.stanford.edu/xg208bd5161

Undergraduate Honors Theses, Doerr School of Sustainability

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