OASR - Examples

  

Figure 2: Reflection coefficients vs frequency and angle for (a) a 1 meter layer of porous sand overlying a ``soft'' halfspace, and (b) a 1 meter thick ``soft'' layer overlying a sand halfspace. Prameters for both media are consistent with those given by Stoll and Kan.

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<1041>> figure=figs/Kan_fig4.ps7.0figs/sand_R.ps6.5 Reflection coefficients vs frequency and angle for porous sand halfspace, reproducing results of Stoll and Kan. fig:sandrc

As an example of the use of OASR for computing seismo-acousticreflection coefficients, the following datafile reproduces the results presented for a sand bottom in Stoll and Kan's paper [22]:

tex2html_preform Sand. Stoll and Kan 81. N C Z 2 0 1414 0 0 0 1 0 0 -1800 -600 0.1 0.2 2.0 0 1. 2.E9 .001 2.65 3.6E10 .47 1.E-10 3.9E-5 2.61E7 4.36E7 1.3 1.3 1.25 10 100000 17 4 0 90 181 0 90 0 10 10 0 15 12 5 0 90 12 15 10 100000 1 1 1 20 0.5 0 2000 12 500 -10 10 12 5

Assembled in one plot, Fig.1, the resulting reflection coeffiecients at the 5 frequencies 0.01, 0.1, 1, 10, and 100 kHz reproduce exactly the results shown in Fig. 4 of Stoll and Kan's paper. In addition, the datafile produces the contour plot in Fig.1 of reflection coefficients vs angle and frequency.

figure

figure=figs/sand_soft_R.ps,height=6.5cm figure=figs/soft_sand_R.ps,height=6.5cm

 

OASES handles arbitrary poro-elastic stratifications, and Fig.2(a) shows the equivalent frequency-angle contours of the reflection coefficient of a 1 m thick layer of sand overlying Stoll and Kan's ``soft'' sediment. Similarly Fig.2

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#1041#> figure=figs/Kan_fig4.ps7.0figs/sand_R.ps6.5 Reflection coefficients vs frequency and angle for porous sand halfspace, reproducing results of Stoll and Kan. fig:sandrc

As an example of the use of OASR for computing seismo-acousticreflection coefficients, the following datafile reproduces the results presented for a sand bottom in Stoll and Kan's paper [22]:

Sand. Stoll and Kan 81.
N C Z
2
0 1414 0 0 0 1 0
0 -1800 -600 0.1 0.2 2.0 0
1. 2.E9 .001 2.65 3.6E10 .47 1.E-10 3.9E-5 2.61E7 4.36E7 1.3 1.3 1.25
10 100000 17 4
0 90 181 0
90 0 10 10
0 15 12 5
0 90 12 15
10 100000 1 1
1 20 0.5
0 2000 12 500
-10 10 12 5

Assembled in one plot, Fig.1, the resulting reflection coeffiecients at the 5 frequencies 0.01, 0.1, 1, 10, and 100 kHz reproduce exactly the results shown in Fig. 4 of Stoll and Kan's paper. In addition, the datafile produces the contour plot in Fig.1 of reflection coefficients vs angle and frequency.

  

Figure: Reflection coefficients vs frequency and angle for (a) a 1 meter layer of porous sand overlying a ``soft'' halfspace, and (b) a 1 meter thick ``soft'' layer overlying a sand halfspace. Prameters for both media are consistent with those given by Stoll and Kan.

OASES handles arbitrary poro-elastic stratifications, and Fig.2(a) shows the equivalent frequency-angle contours of the reflection coefficient of a 1 m thick layer of sand overlying Stoll and Kan's ``soft'' sediment. Similarly Fig.2