Pseudo arrivals generated by frequency normalization for seismic interferometry with scattered waves – Stationary-phase analysis
Name
segam2020-3427903.1.pdf
Description
Published version
Size
1.32 MB
Format
Adobe PDF
Checksum (MD5)
14f04a9c3d142214a1ae57d8a7958f08
Author(s)
Nakata, Nori
Date Issued
September 30, 2020
Journal
SEG Technical Program Expanded Abstracts 2020
Publisher
Society of Exploration Geophysicists
Citation
Nori Nakata; September 1, 2020. "Pseudo arrivals generated by frequency normalization for seismic interferometry with scattered waves — Stationary-phase analysis." Proceedings of the SEG Technical Program Expanded Abstracts 2020. SEG Technical Program Expanded Abstracts 2020. (pp. pp. 2085-2089). ASME.
Version
Final published version
Abstract
Recent development of continuous recording systems used in industry, computational power, and very dense recording system makes seismic interferometry with ambient noise data an interesting tool to estimate structural information. To overcome the complexities of ambient noise, spectral normalization (e.g., whitening) is often used. Here I study different spectral normalization methods, such as crosscorrelation, deconvolution and crosscoherence, using numerical experiments and stationary-phase approximation. In the ideal situation of noise distribution, direct waves are accurately observed for all methods, but scattered waves are not. Especially, coda waves contain a lot of pseudo arrivals. Therefore, if we do not pay attention for the pseudo arrivals, we would use these waves for structural imaging and monitoring and create artifacts. Characterization of such waves using stationary-phase analyses sheds light on using and/or suppressing them.
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1190/segam2020-3427903.1
