Comparison of the FORT approximation of the coupling ray theory with the Fourier pseudospectral method

0365261 - GFÚ 2013 RIV CZ eng J - Journal Article
Pšenčík, Ivan - Farra, V. - Tessmer, E.
Comparison of the FORT approximation of the coupling ray theory with the Fourier pseudospectral method.
Studia geophysica et geodaetica. Roč. 56, č. 1 (2012), s. 35-64. ISSN 0039-3169. E-ISSN 1573-1626
R&D Projects: GA ČR(CZ) GAP210/11/0117
Institutional research plan: CEZ:AV0Z30120515
Keywords : coupling ray theory * Fourier pseudospectral method * first-order ray tracing
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 0.975, year: 2012

The standard ray theory (RT) for inhomogeneous anisotropic media does not work properly or even fails when applied to S-wave propagation in inhomogeneous weakly anisotropic media or in the vicinity of shear-wave singularities. In both cases, the two shear waves propagate with similar phase velocities. The coupling ray theory was proposed to avoid this problem. In it, amplitudes of the two S waves are computed by solving two coupled, frequency-dependent differential equations along a common S-wave ray. In this paper, we test the recently developed approximation of coupling ray theory (CRT) based on the common S-wave rays obtained by first-order ray tracing (FORT).
Permanent Link: http://hdl.handle.net/11104/0200545