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    Traveltime tomographic inversion with simultaneous static corrections - Well worth the effort

    Access Status
    Fulltext not available
    Authors
    Tryggvason, A.
    Schmelzbach, C.
    Juhlin, Christopher
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Tryggvason, A. and Schmelzbach, C. and Juhlin, C. 2009. Traveltime tomographic inversion with simultaneous static corrections - Well worth the effort. Geophysics. 74 (6): pp. XWCB25-XWCB33.
    Source Title
    Geophysics
    DOI
    10.1190/1.3240931
    ISSN
    0016-8033
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/18185
    Collection
    • Curtin Research Publications
    Abstract

    We have developed a first-arrival traveltime inversion scheme that jointly solves for seismic velocities and source and receiver static-time terms. The static-time terms are included to compensate for varying time delays introduced by the near-surface low-velocity layer that is too thin to be resolved by tomography. Results on a real data set consisting of picked first-arrival times from a seismic-reflection 2D/3D experiment in a crystalline environment show that the tomography static-time terms are very similar in values and distribution to refraction-static corrections computed using standard refraction-statics software. When applied to 3D seismic-reflection data, tomography static-time terms produce similar or more coherent seismic-reflection images compared to the images using corrections from standard refraction-static software. Furthermore, the method provides a much more detailed model of the near-surface bedrock velocity than standard software when the static-time terms are included in the inversion. Low-velocity zones in this model correlate with other geologic and geophysical data, suggesting that our method results in a reliable model. In addition to generally being required in seismic-reflection imaging, static corrections are also necessary in traveltime tomography to obtain high-fidelity velocity images of the subsurface. © 2009 Society of Exploration Geophysicists.

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