1887

Abstract

Summary

We present here Scholte and Love wave phase velocity tomography at the Valhall Oil Field using ambient noise recorded by a network of 3D multi-component ocean bottom cable. We have cross-correlated 6.5 hours of continuous recording of noise between vertical-vertical (ZZ), radial-radial (RR), and transverse-transverse (TT) components. After applying an F-K filter, we were able to extract the first overtone of Scholte waves at Valhall from the RR cross-correlations. We then used the filtered overtone waveforms to measure inter-station frequency-dependent phase time delays and constructed 2D phase-velocity maps with the Eikonal tomography method.

Furthermore, we compute average dispersion curves for Scholte and Love waves by combining information from more than 10 millions of individual cross-correlations. We use the Neighbourhood algorithm to invert jointly these dispersion curves and to obtain an average 1D anisotropic model of the Valhall overburden down to depths of ~1 km. We find a significant radial anisotropy at depths below 600 m. This average 1D model is used as a reference model for the 3D inversion.

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/content/papers/10.3997/2214-4609.201413544
2015-06-01
2024-04-26
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References

  1. Campillo, M., and Paul, A.
    [2003] Long-range correlations in the diffuse seismic coda: Science, 299, 547–549.
    [Google Scholar]
  2. Campillo, M., Roux, P. and Shapiro, N.M.
    [2011] Correlation of seismic ambient noise to image and monitor the solid Earth: Encyclopedia of Solid Earth Geophysics, Springer-Verlag.
    [Google Scholar]
  3. Gabriels, P., Snieder, R. & Nolet, G.
    [1987] In situ measurements of shear- wave velocity in sediments with higher-mode Rayleigh waves, Geophys. Prospect., 35, 187–196.
    [Google Scholar]
  4. Huang, H., Yao, H. and van der Hilst, R. D.
    [2010] Radial anisotropy in the crust of SE Tibet and SW China from ambient noise interferometry: Geophysical Research Letters, 37,
    [Google Scholar]
  5. Kimman, W.P. & Trampert, J.
    [2010] Approximations in seismic interferometry and their effects on surface waves, Geophys. J. Int., 182(1), 461–476.
    [Google Scholar]
  6. Lin, F.C., Ritzwoller, M.H., Townend, J., Bannister, S. & Savage, M.K.
    [2007] Ambient noise Rayleigh wave tomography of New Zealand, Geophys. J. Int., 170(2), 649–666.
    [Google Scholar]
  7. Lin, F.C., Moschetti, M.P. & Ritzwoller, M.H.
    [2008] Surface wave tomog- raphy of the western United States from ambient seismic noise: Rayleigh and Love wave phase velocity maps, Geophys. J. Int., 173(1), 281–298.
    [Google Scholar]
  8. Lin, F.C., Ritzwoller, M.H. & Snieder, R.
    [2009] Eikonal tomography: sur- face wave tomography by phase front tracking across a regional broad- band seismic array, Geophys. J. Int., 177(3), 1091–1110.
    [Google Scholar]
  9. Mordret, A., Landès, M., Shapiro, N.M., Singh, S.C., Roux, P. & Barkved, O.I.
    [2013] Near-surface study at Valhall from ambient noise surface wave tomography, Geophys. J. Int., 193(3), 1627–1643.
    [Google Scholar]
  10. Mordret, A., Landès, M., Shapiro, N.M., Singh, S.C., Roux
    [2014] Ambient noise surface wave tomography to determine the shallow shear velocity structure at Valhall: depth inversion with a Neighbourhood Algorithm: Geophys. J. Int., 198, 1514–1525.
    [Google Scholar]
  11. Nishida, K., Montagner, J.-P. & Kawakatsu, H.
    [2009] Global surface wave tomography using seismic hum, Science, 326(5949), 112–112.
    [Google Scholar]
  12. Ritzwoller, M.H., Lin, F.C. & Shen, W.
    [2011] Ambient noise tomography with a large seismic array, Comptes Rendus Geoscience, 343(8), 558–570.
    [Google Scholar]
  13. Sambridge, M.
    [1999] Geophysical inversion with a neighbourhood algorithm. Searching a parameter space, Geophys. J. Int., 138(2), 479–494.
    [Google Scholar]
  14. Shapiro, N. M., and Campillo
    , [2004] Emergence of broadband Rayleigh waves from correlations of the ambient seismic noise: Geophysical Research Letters, 31, 1615–1619.
    [Google Scholar]
  15. Shapiro, N. M. M., Campillo, M., Stehly, L. and Ritzwoller, M.
    [2005] High-re- solution surface-wave tomography from ambient seismic noise: Science, 307, 1615–1618.
    [Google Scholar]
  16. Wathelet, M., Jongmans, D. & Ohrnberger, M.
    [2004] Surface wave inversion using a direct search algorithm and its application to ambient vibration measurements, Near Surf. Geophys., 2(4), 211–221.
    [Google Scholar]
  17. Yang, Y., Ritzwoller, M.H., Levshin, A.L. & Shapiro, N.M.
    [2007] Ambient noise Rayleigh wave tomography across Europe, Geophys. J. Int., 168, 259–274.
    [Google Scholar]
  18. Zheng, Y., Shen, W., Zhou, L., Yang, Y., Xie, Z. & Ritzwoller, M.H.
    [2011] Crust and uppermost mantle beneath the North China Craton, northeastern China, and the Sea of Japan from ambient noise tomography, J. Geophys. Res.: Solid Earth, 116 (1978–2012).
    [Google Scholar]
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