Seismic wave modeling for seismic imaging

2009 ◽  
Vol 28 (5) ◽  
pp. 538-544 ◽  
Author(s):  
Jean Virieux ◽  
Stéphane Operto ◽  
Hafedh Ben-Hadj-Ali ◽  
Romain Brossier ◽  
Vincent Etienne ◽  
...  
Keyword(s):  
Seismic Wave ◽  
Seismic Imaging ◽  
Wave Modeling

A modified symplectic scheme for seismic wave modeling

2015 ◽  
Vol 116 ◽  
pp. 110-120 ◽  
Author(s):  
Shaolin Liu ◽  
Xiaofan Li ◽  
Wenshuai Wang ◽  
Ling Xu ◽  
Bingfei Li
Keyword(s):  
Seismic Wave ◽  
Wave Modeling ◽  
Symplectic Scheme

A new generalized stiffness reduction method for 2D/2.5D frequency-domain seismic wave modeling in viscoelastic anisotropic media

Geophysics ◽  
2020 ◽  
Vol 85 (6) ◽  
pp. T315-T329
Author(s):  
Qingjie Yang ◽  
Bing Zhou ◽  
Mohamed Kamel Riahi ◽  
Mohammad Al-khaleel
Keyword(s):  
Free Surface ◽  
Frequency Domain ◽  
Seismic Wave ◽  
Reduction Method ◽  
Numerical Solutions ◽  
Anisotropic Media ◽  
Spectral Element ◽  
Wave Modeling ◽  
Adaptation Capacity ◽  
Stiffness Reduction

In frequency-domain seismic wave modeling, absorbing artificial reflections is crucial to obtain accurate numerical solutions. We have determined that, in viscoelastic anisotropic media (VEAM), the most popular absorbing boundary techniques, such as the perfectly matched layer and the generalized stiffness reduction method (GSRM), fail. Then, we develop a new version of the GSRM and incorporate it into a 2D/2.5D spectral element method. We find with extensive nontrivial numerical experiments that the new GSRM exhibits excellent features of simple and efficient implementation, while handling free-surface and subsurface interface topography. Furthermore, we find that sampling the positive wavenumber range is an efficient strategy to compute the 3D wavefield in arbitrary 2D VEAM, and the new version takes full advantage of the symmetry/antisymmetry of the wavefield. The new GSRM removes artificial reflections by damping the real and imaginary viscoelastic moduli in different ways. The wavefields in two vertically transverse isotropic and one orthorhombic viscoelastic homogeneous models are compared with the corresponding analytical solutions to show the high accuracy performance of the new GSRM. Finally, a complex 2D geologic model with irregular free-surface and subinterface is considered to present the modeling technique and its adaptation capacity for complex 2D VEAM.

Seismic exploration on a floating ice sheet

Geophysics ◽  
1990 ◽  
Vol 55 (4) ◽  
pp. 402-409 ◽  
Author(s):  
C. A. Rendleman ◽  
F. K. Levin
Keyword(s):  
Point Source ◽  
Seismic Wave ◽  
Water Depth ◽  
Ice Sheet ◽  
Water Layer ◽  
Seismic Exploration ◽  
The Arctic ◽  
Wave Modeling ◽  
Variable Water

Using a point‐source viscoelastic seismic wave modeling program, we simulated the seismograms that would be recorded for a system of an ice sheet floating on a water layer, the latter underlain by a solid containing a single isolated reflector. Ice and water layer thicknesses were 1.52–6.10 m. Sources were placed successively on the surface of the ice, in the water, and in the bottom; detectors (vertical geophones or hydrophones) were placed successively on the ice, in the water, and in the bottom. A source on the ice generated such strong antisymmetric modal energy that no reflections could be detected. A source buried 15–30 m below the bottom of the water resulted in clear reflections, whether the reflections were detected with surface geophones or buried hydrophones. Geophysicists have often observed data very similar to that which we modeled, but not universally. In practice, vibrators on floating ice produce usable reflections for a fixed but year‐to‐year variable water depth. To explain this observation, we are forced to assume that the floating annual ice of the Arctic is a strongly attenuative material.

scholarly journals One-dimension nonlinear and dispersive seismic wave modeling in solid media

2015 ◽  
Vol 64 (23) ◽  
pp. 239101
Author(s):  
Zhou Cong ◽  
Wang Qing-Liang
Keyword(s):  
Seismic Wave ◽  
One Dimension ◽  
Wave Modeling ◽  
Solid Media
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