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Traveltime tomographic inversion with simultaneous static corrections: Well worth the effort
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
University of Potsdam.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2009 (English)In: Geophysics, ISSN 0016-8033, E-ISSN 1942-2156, Vol. 74, no 6, WCB25-WCB33 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2009. Vol. 74, no 6, WCB25-WCB33 p.
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-114515DOI: 10.1190/1.3240931ISI: 000273896600025OAI: oai:DiVA.org:uu-114515DiVA: diva2:294295
Available from: 2010-02-16 Created: 2010-02-16 Last updated: 2017-12-12Bibliographically approved

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Tryggvason, AriJuhlin, Christopher

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