دورية أكاديمية
On seismic gradiometric wave equation inversion for density
| العنوان: | On seismic gradiometric wave equation inversion for density |
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| المؤلفون: | Faber, Marthe, Curtis, Andrew |
| المساهمون: | National Research Fund, Natural Environment Research Council |
| المصدر: | Geophysical Journal International ; volume 237, issue 3, page 1459-1489 ; ISSN 0956-540X 1365-246X |
| بيانات النشر: | Oxford University Press (OUP) |
| سنة النشر: | 2024 |
| مصطلحات موضوعية: | Geochemistry and Petrology, Geophysics |
| الوصف: | SUMMARY Material density remains poorly constrained in seismic imaging problems, yet knowledge of density would provide important insight into physical material properties for the interpretation of subsurface structures. We test the sensitivity to subsurface density contrasts of spatial and temporal gradients of seismic ambient noise wavefields, using wave equation inversion (WEI), a form of seismic gradiometry. Synthetic results for 3-D acoustic media suggest that it is possible to estimate relative density structure with WEI by using a full acoustic formulation for wave propagation and gradiometry. We show that imposing a constant density assumption on the medium can be detrimental to subsurface seismic velocity images. By contrast, the full acoustic formulation allows us to estimate density as an additional material parameter, as well as to improve phase velocity estimates. In 3-D elastic media, severe approximations in the governing wave physics are necessary in order to invert for density using only an array of receivers on the Earth's free surface. It is then not straightforward to isolate the comparatively weak density signal from the influence of phase velocity using gradiometric WEI. However, by using receivers both at the surface and in the shallow subsurface we show that it is possible to estimate density using fully elastic volumetric WEI. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1093/gji/ggae097 |
| DOI: | 10.1093/gji/ggae097/56911665/ggae097.pdf |
| الإتاحة: | https://doi.org/10.1093/gji/ggae097Test https://academic.oup.com/gji/article-pdf/237/3/1459/57214926/ggae097.pdfTest |
| حقوق: | https://creativecommons.org/licenses/by/4.0Test/ |
| رقم الانضمام: | edsbas.F599A7EB |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/gji/ggae097 |
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