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| Titel |
Regional wave propagation using the discontinuous Galerkin method |
| VerfasserIn |
S. Wenk, C. Pelties, H. Igel, M. Käser |
| 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 ; 4, no. 1 ; Nr. 4, no. 1 (2013-01-30), S.43-57 |
| Datensatznummer |
250017347
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| Publikation (Nr.) |
 copernicus.org/se-4-43-2013.pdf |
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| Zusammenfassung |
| We present an application of the discontinuous Galerkin (DG) method to regional
wave propagation. The method makes use of unstructured tetrahedral meshes,
combined with a time integration scheme solving the arbitrary high-order
derivative (ADER) Riemann problem. This ADER-DG method is high-order accurate in
space and time, beneficial for reliable simulations of high-frequency wavefields
over long propagation distances. Due to the ease with which tetrahedral grids
can be adapted to complex geometries, undulating topography of the Earth's
surface and interior interfaces can be readily implemented in the computational
domain. The ADER-DG method is benchmarked for the accurate radiation of elastic
waves excited by an explosive and a shear dislocation source. We compare real
data measurements with synthetics of the 2009 L'Aquila event (central Italy). We
take advantage of the geometrical flexibility of the approach to generate a
European model composed of the 3-D EPcrust model, combined with the
depth-dependent ak135 velocity model in the upper mantle. The results
confirm the applicability of the ADER-DG method for regional scale earthquake
simulations, which provides an alternative to existing methodologies. |
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