Publication Date:
2022-12-01
Description:
NEXD is an open source software package for the simulation of seismic waves in complex geological media.
This includes elastic, viscoelastic, porous and fractured media with complex geometries. For the computation
of the wave fields, the nodal discontinuous Galerkin approach (NDG) is used. The NDG approach combines
unstructured tetrahedral meshes with an element-wise, high-order spatial interpolation of the wave field
based on Lagrange polynomials. NEXD offers capabilities for modeling wave propagation in one-, two- and
three-dimensional settings of very different spatial scale with little logistical overhead. It allows the import of
external triangular (2D) and tetrahedral (3D) meshes provided by independent meshing software and can be
run in a parallel computing environment. The computation of adjoint wavefields and an interface for the
computation of waveform sensitivity kernels are offered. The method is verified by means of symmetry tests
and the method of exact solutions. The capabilities of NEXD are demonstrated through, for example, a 2D
synthetic survey of a geological carbon storage site. The most recent developments have been the inclusion
of porous media in 2D and the inversion capabilities to the latest release versions of the 2D and 3D codes as
well as the release of the 1D code. NEXD is available on GitHub: https://github.com/seismology-RUB.
Description:
poster
Keywords:
ddc:550
;
Numerical modelling
;
Computational seismology
;
Wave propagation
Language:
English
Type:
doc-type:conferenceObject
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