Comparison of Full Wavefield Synthetics with Frequency-Dependent Traveltimes Calculated Using Wavelength-Dependent Velocity Smoothing

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dc.citation.firstpage133
dc.citation.issueNumber2
dc.citation.journalTitleJournal of Environmental and Engineering Geophysics
dc.citation.lastpage141
dc.citation.volumeNumber22
dc.contributor.authorChen, Jianxiong
dc.contributor.authorZelt, Colin A.
dc.date.accessioned2017-08-04T12:29:40Z
dc.date.available2017-08-04T12:29:40Z
dc.date.issued2017
dc.description.abstractRay theory-based traveltime calculation that assumes infinitely high frequency wave propagation is likely to be invalid in the near-surface (upper tens of meters) due to the relatively large seismic wavelength compared with the total travel path lengths and the scale of the near-surface velocity heterogeneities. The wavelength-dependent velocity smoothing (WDVS) algorithm calculates a frequency-dependent, first-arrival traveltime by assuming that using a wavelength-smoothed velocity model and conventional ray theory is equivalent to using the original unsmoothed model and a frequency-dependent calculation. This paper presents comparisons of WDVS-calculated traveltimes with band-limited full wavefield synthetics including the results from 1) different velocity models, 2) different frequency spectra, 3) different values of a free parameter in the WDVS algorithm, and 4) different levels of added noise to the synthetics. The results show that WDVS calculates frequency-dependent traveltimes that are generally consistent with the first arrivals from band-limited full wavefield synthetics. Compared to infinite-frequency traveltimes calculated using conventional ray theory, the WDVS frequency-dependent traveltimes are more consistent with the first arrivals picked from full wavefield synthetics in terms of absolute time and trace-to-trace variation. The results support the use of WDVS as the forward modeling component of a tomographic inversion method, or any seismic method that involves modeling first-arrival traveltimes.
dc.identifier.citationChen, Jianxiong and Zelt, Colin A.. "Comparison of Full Wavefield Synthetics with Frequency-Dependent Traveltimes Calculated Using Wavelength-Dependent Velocity Smoothing." <i>Journal of Environmental and Engineering Geophysics,</i> 22, no. 2 (2017) Society of Exploration Geophysicists: 133-141. https://doi.org/10.2113/JEEG22.2.133.
dc.identifier.digitalComparison_Full_Wavefield_Synthetics
dc.identifier.doihttps://doi.org/10.2113/JEEG22.2.133
dc.identifier.urihttps://hdl.handle.net/1911/96572
dc.language.isoeng
dc.publisherSociety of Exploration Geophysicists
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleComparison of Full Wavefield Synthetics with Frequency-Dependent Traveltimes Calculated Using Wavelength-Dependent Velocity Smoothing
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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