The Spectral-Element Method in Seismology

Dimitri Komatitsch, Seiji Tsuboi, Jeroen Tromp

Research output: Chapter in Book/Report/Conference proceedingChapter

39 Scopus citations

Abstract

We present the main properties of the spectral-element method, which is well suited for numerical calculations of synthetic seismograms for three-dimensional Earth models. The technique is based upon a weak formulation of the equations of motion and combines the flexibility of a finite-element method with the accuracy of a pseudospectral method. The mesh is composed of hexahedral elements and honors the main discontinuities in the Earth model. The displacement vector is expressed in each element in terms of high-degree Lagrange interpolants, and integrals are computed based upon Gauss-Lobatto-Legendre quadrature, which leads to an exactly diagonal mass matrix and therefore drastically simplifies the algorithm. We use a fluid-solid coupling formulation that does not require iterations at the core-mantle or inner-core boundaries. The method is efficiently implemented on parallel computers with distributed memory based upon a message-passing methodology. We present two large-scale simulations for a realistic three-dimensional Earth model computed on the Japanese Earth Simulator at periods of 5 s and longer.

Original languageEnglish (US)
Title of host publicationSeismic Earth
Subtitle of host publicationArray Analysis of Broadband Seismograms
Publisherwiley
Pages205-227
Number of pages23
ISBN (Electronic)9781118666333
ISBN (Print)087590422X, 9780875904221
DOIs
StatePublished - Mar 19 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • Seismic arrays
  • Seismograms

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    Komatitsch, D., Tsuboi, S., & Tromp, J. (2013). The Spectral-Element Method in Seismology. In Seismic Earth: Array Analysis of Broadband Seismograms (pp. 205-227). wiley. https://doi.org/10.1029/157GM13