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    Rayleigh Wave Phase-Slope Tomography

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    Type
    Conference Paper
    Authors
    Zhang, Z.
    Alkhalifah, Tariq Ali cc
    Saygin, E.
    He, L.
    KAUST Department
    King Abdullah University of Science & Technology
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020
    Embargo End Date
    2021
    Permanent link to this record
    http://hdl.handle.net/10754/668218
    
    Metadata
    Show full item record
    Abstract
    Traditional approaches of utilizing the dispersion curves in S-wave velocity reconstruction have many limitations, namely, the 1D layered model assumption and the automatic/manual picking of dispersion curves. On the other hand, conventional full-waveform inversion (FWI) can easily converge to one of the local minima when applied directly to complicated surface waves. Alternatively, a wave equation dispersion spectrum inversion can avoid these limitations, by inverting the slopes of arrivals at different frequencies. A local-similarity objective function is used to avoid possible cycle skipping. We apply the proposed method on the large-scale ambient-noise data recorded at a large-N array with over 3000 recorders. So we can estimate the shear-wave velocities down to 1.8 km depth. The main benefits of the proposed method are 1) it handles lateral variations; 2) it avoids picking dispersion curves; 3) it utilizes both the fundamental- and higher-modes of Rayleigh waves, and 4) it can be solved using gradientbased local optimizations. A good match between the observed and predicted dispersion spectra also leads to a reasonably good match between the observed and predicted waveforms, though the inversion does not aim to match the waveforms.
    Citation
    Zhang, Z., Alkhalifah, T., Saygin, E., & He, L. (2020). Rayleigh Wave Phase-Slope Tomography. EAGE 2020 Annual Conference & Exhibition Online. doi:10.3997/2214-4609.202010275
    Sponsors
    The authors wish to acknowledge the financial assistance provided through Australian National Low Emissions Coal Research and Development (ANLEC R&D). We thank David Lumley for his contribution to the retrieval of the continuous part of the SW HUB dataset. For computer time, this research used the resources of the Supercomputing Laboratory at King Abdullah University of Science & Technology (KAUST) in Thuwal, Saudi Arabia.
    Publisher
    EAGE Publications
    Conference/Event name
    EAGE2020: Annual Conference Online
    DOI
    10.3997/2214-4609.202010275
    Additional Links
    https://www.earthdoc.org/content/papers/10.3997/2214-4609.202010275
    ae974a485f413a2113503eed53cd6c53
    10.3997/2214-4609.202010275
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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