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Full-3-D tomography for crustal structure in Southern California based on the scattering-integral and the adjoint-wavefield methods

Lee, En-Jui ; Chen, Po ; Jordan, Thomas H. ; Maechling, Phillip B. ; Denolle, Marine A. M. ; Beroza, Gregory C.

Journal of geophysical research. Solid earth, 2014-08, Vol.119 (8), p.6421-6451 [Periódico revisado por pares]

Washington: Blackwell Publishing Ltd

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  • Título:
    Full-3-D tomography for crustal structure in Southern California based on the scattering-integral and the adjoint-wavefield methods
  • Autor: Lee, En-Jui ; Chen, Po ; Jordan, Thomas H. ; Maechling, Phillip B. ; Denolle, Marine A. M. ; Beroza, Gregory C.
  • Assuntos: adjoint ; Computation ; Crustal structure ; Earthquakes ; Elastodynamics ; full waveform ; Geological faults ; Geological hazards ; Geophysics ; Hazard assessment ; Integrals ; Inversion ; Iterative methods ; Mathematical models ; Navigation ; Nonlinear systems ; Nonlinearity ; Physics ; Plate tectonics ; Refraction ; Scattering ; scattering integral ; Sedimentary basins ; Seismic activity ; Seismic analysis ; Seismic hazard ; Seismic phenomena ; Seismograms ; Seismology ; Slip ; Southern California ; Tectonics ; Tomography ; Velocity
  • É parte de: Journal of geophysical research. Solid earth, 2014-08, Vol.119 (8), p.6421-6451
  • Notas: National Science Foundation - No. 0944206
    istex:9169D82F534C9A4C45BEAEDCC22C8C2DA61F3DEE
    Southern California Earthquake Center, the U.S. Geological Survey - No. G10AP00032
    ark:/67375/WNG-MW5FZ976-Q
    ArticleID:JGRB50780
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: We have successfully applied full‐3‐D tomography (F3DT) based on a combination of the scattering‐integral method (SI‐F3DT) and the adjoint‐wavefield method (AW‐F3DT) to iteratively improve a 3‐D starting model, the Southern California Earthquake Center (SCEC) Community Velocity Model version 4.0 (CVM‐S4). In F3DT, the sensitivity (Fréchet) kernels are computed using numerical solutions of the 3‐D elastodynamic equation and the nonlinearity of the structural inversion problem is accounted for through an iterative tomographic navigation process. More than half‐a‐million misfit measurements made on about 38,000 earthquake seismograms and 12,000 ambient‐noise correlagrams have been assimilated into our inversion. After 26 F3DT iterations, synthetic seismograms computed using our latest model, CVM‐S4.26, show substantially better fit to observed seismograms at frequencies below 0.2 Hz than those computed using our 3‐D starting model CVM‐S4 and the other SCEC CVM, CVM‐H11.9, which was improved through 16 iterations of AW‐F3DT. CVM‐S4.26 has revealed strong crustal heterogeneities throughout Southern California, some of which are completely missing in CVM‐S4 and CVM‐H11.9 but exist in models obtained from previous crustal‐scale 2‐D active‐source refraction tomography models. At shallow depths, our model shows strong correlation with sedimentary basins and reveals velocity contrasts across major mapped strike‐slip and dip‐slip faults. At middle to lower crustal depths, structural features in our model may provide new insights into regional tectonics. When combined with physics‐based seismic hazard analysis tools, we expect our model to provide more accurate estimates of seismic hazards in Southern California. Key Points Full‐3‐D tomography for Southern California crustBased on a combination of the SI and AW methodsAbout half‐a‐million data were used
  • Editor: Washington: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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