Type
Conference PaperKAUST Department
King Abdullah University of Science & TechnologyEarth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2020Embargo End Date
2021Permanent link to this record
http://hdl.handle.net/10754/668218
Metadata
Show full item recordAbstract
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:10.3997/2214-4609.202010275Sponsors
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 PublicationsConference/Event name
EAGE2020: Annual Conference OnlineAdditional Links
https://www.earthdoc.org/content/papers/10.3997/2214-4609.202010275ae974a485f413a2113503eed53cd6c53
10.3997/2214-4609.202010275