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7
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0345072527
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J. Ritsema, H. J. Van Heijst, J. H. Woodhouse, Science 286, 1925 (1999). Mantle model S20RTS is a degree 20 shear velocity model based on fundamental and higher-mode Rayleigh wave dispersion, teleseismic body wave travel times, and normal-mode splitting data. It is assumed that compressional velocity heterogeneity α is identical to shear velocity heterogeneity β in S20RTS, except for a depth-dependent scaling factor, R = δlnβ/δlnβ, which increases linearly from 1.3 at the surface to 3.0 at the core-mantle boundary.
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(1999)
Science
, vol.286
, pp. 1925
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Ritsema, J.1
Van Heijst, H.J.2
Woodhouse, J.H.3
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8
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0004162638
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Cambridge Univ. Press, Cambridge
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V. Červený, Seismic Ray Theory (Cambridge Univ. Press, Cambridge, 2001).
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(2001)
Seismic Ray Theory
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Červený, V.1
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18
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2242488485
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note
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The main difficulty comes from the singularity of coordinates at the center of Earth.
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23
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2242427341
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Not all of these effects play an important role at any given frequency: the effects of self-gravitation and rotation only matter at periods longer than about 100 s, whereas the effect of the oceans is only observed at periods less than about 50 s.
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27
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2242462455
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thesis, Université Paris VII Denis Diderot. This thesis introduces the first implementation of the SEM for global wave propagation
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E. Chaljub, thesis, Université Paris VII Denis Diderot (2000). This thesis introduces the first implementation of the SEM for global wave propagation.
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(2000)
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Chaljub, E.1
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28
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0036252025
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D. Komatitsch, J. Tromp, Geophys. J. Int. 149, 390 (2002). The article discusses the theoretical and numerical aspects of the SEM and validates the method for seismic wave propagation at the scale of the entire globe.
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(2002)
Geophys. J. Int.
, vol.149
, pp. 390
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Komatitsch, D.1
Tromp, J.2
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32
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0030243005
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W. Gropp, E. Lusk, N. Doss, A. Skjellum, Parallel Comput. 22, 789 (1996).
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(1996)
Parallel Comput.
, vol.22
, pp. 789
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Gropp, W.1
Lusk, E.2
Doss, N.3
Skjellum, A.4
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2242470537
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note
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The cost of the calculation is due to the fact that the mesh contains 498 million degrees of freedom.
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34
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0001511635
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C. Bassin, G. Laske, G. Masters, EOS 81, F897 (2000). To avoid artificial reflections between block edges, we slightly smooth model CRUST2.0 by averaging over spherical caps with a 2° radius.
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(2000)
EOS
, vol.81
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Bassin, C.1
Laske, G.2
Masters, G.3
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85080852099
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PREM) is determined by applying the same cross-correlation method to SEM synthetic seismograms computed for 50 earthquakes at 400 worldwide stations, which renders a geographical distribution of 55 bounce points that is similar to the data. This calculation required a total of 100 days of dedicated CPU time on our PC cluster.
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(2002)
Geophys. Res. Lett.
, vol.29
, pp. 72
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Ritsema, J.1
Rivera, L.A.2
Komatitsch, D.3
Tromp, J.4
Van Heijst, H.J.5
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0034905644
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L. X. Wen, P. G. Silver, D. James, R. Kuehnel, Earth Planet. Sci. Lett. 189, 141 (2001).
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(2001)
Earth Planet. Sci. Lett.
, vol.189
, pp. 141
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Wen, L.X.1
Silver, P.G.2
James, D.3
Kuehnel, R.4
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0037036104
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S. D. Ni, E. Tan, M. Gumis, D. V. Helmberger, Science 296, 1850 (2002).
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(2002)
Science
, vol.296
, pp. 1850
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Ni, S.D.1
Tan, E.2
Gumis, M.3
Helmberger, D.V.4
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We encourage interested research groups to download the SEM software package from the "Theoretical and Computational Seismology" Web page of the Seismological Laboratory at Caltech (www. gps.caltech.edu/∼jtromp/research).
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Theoretical and Computational Seismology
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note
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55-5 map, and two anonymous reviewers for helpful comments. This research was funded in part by the NSF.
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