دورية أكاديمية
Global adjoint tomography: First-generation model
| العنوان: | Global adjoint tomography: First-generation model |
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| المؤلفون: | Bozdağ, Ebru, Peter, Daniel, Lefebvre, Matthieu, Komatitsch, Dimitri, Tromp, Jeroen, Hill, Judith C., Podhorszki, Norbert, Pugmire, David |
| المساهمون: | Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ), King Abdullah University of Science and Technology Saudi Arabia (KAUST), Department of Geosciences Princeton, Princeton University, Ondes et Imagerie (O&I), Laboratoire de Mécanique et d'Acoustique Marseille (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Oak Ridge National Laboratory Oak Ridge (ORNL), UT-Battelle, LLC |
| المصدر: | ISSN: 0956-540X. |
| بيانات النشر: | HAL CCSD Oxford University Press (OUP) |
| سنة النشر: | 2016 |
| المجموعة: | HAL Université Côte d'Azur |
| مصطلحات موضوعية: | Body waves, Computational seismology, Seismic anisotropy, Seismic tomography, Surface waves and free oscillations, Waveform inversion, Wave propagation, [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
| الوصف: | International audience ; We present the first-generation global tomographic model constructed based on adjoint tomography, an iterative full-waveform inversion technique. Synthetic seismograms were calculated using GPU-accelerated spectral-element simulations of global seismic wave propagation, accommodating effects due to 3D anelastic crust & mantle structure, topography & bathymetry, the ocean load, ellipticity, rotation, and self-gravitation. Fréchet derivatives were calculated in 3D anelastic models based on an adjoint-state method. The simulations were performed on the Cray XK7 named ‘Titan’, a computer with 18,688 GPU accelerators housed at Oak Ridge National Laboratory. The transversely isotropic global model is the result of 15 tomographic iterations, which systematically reduced differences between observed and simulated three-component seismograms. Our starting model combined 3D mantle model S362ANI (Kustowski et al. 2008) with 3D crustal model Crust2.0 (Bassin et al. 2000). We simultaneously inverted for structure in the crust and mantle, thereby eliminating the need for widely used ‘crustal corrections’. We used data from 253 earthquakes in the magnitude range 5.8~ ≤ ~Mw~ ≤ ~7.0. For the first 12 iterations, we combined ∼30 s body-wave data with ∼60 s surface-wave data. The shortest period of the surface waves was gradually decreased, and in the last three iterations we combined ∼17 s body waves with ∼45 s surface waves. We started using 180 min-long seismograms after the 12th iteration and assimilated minor- and major-arc body and surface waves. The 15th iteration model features enhancements of well-known slabs, an enhanced image of the Samoa/Tahiti plume, as well as various other plumes and hotspots, such as Caroline, Galapagos, Yellowstone, and Erebus. Furthermore, we see clear improvements in slab resolution along the Hellenic and Japan Arcs, as well as subduction along the East of Scotia Plate, which does not exist in the starting model. Point-spread function tests demonstrate that we ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | hal-01358076; https://hal.science/hal-01358076Test; https://hal.science/hal-01358076/documentTest; https://hal.science/hal-01358076/file/ggw356.pdfTest |
| DOI: | 10.1093/gji/ggw356 |
| الإتاحة: | https://doi.org/10.1093/gji/ggw356Test https://hal.science/hal-01358076Test https://hal.science/hal-01358076/documentTest https://hal.science/hal-01358076/file/ggw356.pdfTest |
| حقوق: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.5CF71491 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/gji/ggw356 |
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