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| Titel |
AxiSEM: broadband 3-D seismic wavefields in axisymmetric media |
| VerfasserIn |
T. Nissen-Meyer, M. van Driel, S. C. Stähler, K. Hosseini, S. Hempel, L. Auer, A. Colombi, A. Fournier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-06-04), S.425-445 |
| Datensatznummer |
250115277
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| Publikation (Nr.) |
 copernicus.org/se-5-425-2014.pdf |
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| Zusammenfassung |
| We present a methodology to compute 3-D global seismic wavefields for
realistic earthquake sources in visco-elastic anisotropic media, covering
applications across the observable seismic frequency band with moderate
computational resources. This is accommodated by mandating axisymmetric
background models that allow for a multipole expansion such that only a 2-D
computational domain is needed, whereas the azimuthal third dimension is
computed analytically on the fly. This dimensional collapse opens doors for
storing space–time wavefields on disk that can be used to compute
Fréchet sensitivity kernels for waveform tomography. We use the
corresponding publicly available AxiSEM (www.axisem.info) open-source
spectral-element code, demonstrate its excellent scalability on
supercomputers, a diverse range of applications ranging from normal modes to
small-scale lowermost mantle structures, tomographic models, and comparison
with observed data, and discuss further avenues to pursue with this
methodology. |
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