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https://repositorio.ufba.br/handle/ri/13506
Tipo: | Artigo de Periódico |
Título: | Tunneling of seismic body waves through thin high-velocity layers in complex structures |
Título(s) alternativo(s): | Studia Geophysica et Geodaetica |
Autor(es): | Červený, Vlastislav Aranha, Paulo R. A. |
Autor(es): | Červený, Vlastislav Aranha, Paulo R. A. |
Abstract: | The hybrid ray-reflectivity method is applied to the problem of the transmission of the reflected wave field through a thin high-velocity layer (or through a thin stack of high velocity layers), situated in the overburden of the reflector. In the hybrid ray-reflectivity method, the standard ray method is applied in the smooth parts of the model, and the reflectivity method is used locally at the thin high-velocity layer. With the exception of small epicentral distances, the standard ray method itself fails in such computations. The reason is that a considerable part of the energy for overcritical angles of incidence may be tunneled through the thin high-velocity layer along complex ray-paths, corresponding to inhomogeneous waves. The reflectivity method, applied locally at the thin high-velocity layer, automatically includes all inhomogeneous wave contributions. Thus, the hybrid ray-reflectivity method removes fully the limitations of the standard ray method, but still retains its main advantages, such as its applicability to 2-D and 3-D complex layered structures, flexibility, and low-cost computations. In the numerical examples, the hybrid ray-reflectivity synthetic seismograms are compared with standard ray synthetic seismograms and with full reflectivity computations. The numerical examples show that the hybrid ray-reflectivity method describes the tunneling of seismic energy through a thin high-velocity layer with sufficient accuracy. |
Editora / Evento / Instituição: | Studia Geophysica et Geodaetica |
Tipo de Acesso: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/13506 |
Data do documento: | 1992 |
Aparece nas coleções: | Artigo Publicado em Periódico (IGEO) |
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3333333333333333.pdf | 1,86 MB | Adobe PDF | Visualizar/Abrir |
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