Comparison of FD and FDFE for topography model:

**model topography: **

Receivers R1 .. R13 are located on a free surface with a constant horizontal spacing of 166.66 m, the R1 receiver is on the top of the ridge. Receivers R14 .. R19 are located in depth z=615.6 m, the horizontal distance of these receivers is as follows: R14=0.0 m, R15=11.165 m, R16=166.667 m, R17=333.333 m, R18=500.0 m, R19=1000.0 m.

There are no artificial reflections arriving to any of
the receivers during the defined time window. Computation was done for
a series of cases with v_{p}=2000 m/s and v_{s}=1400 ,
1000 , 750 , 500 , 300 , 200 , 0.01 m/s (the last one being just formal).

**model 00 :** **v _{p}=2000,
v_{s}=0.01 m/s, v_{p}/v_{s}=
infinity ( formal ' liquid ridge ' )**

**model 01 :** **v _{p}=2000,
v_{s}=200 m/s, v_{p}/v_{s}=
10**

**model 02 :** **v _{p}=2000,
v_{s}=300 m/s, v_{p}/v_{s}=
6.7**

**model 03 :** **v _{p}=2000,
v_{s}=500 m/s, v_{p}/v_{s}=
4**

**model 04 :** **v _{p}=2000,
v_{s}=750 m/s, v_{p}/v_{s}=
2.7**

**model 05 :** **v _{p}=2000,
v_{s}=1000 m/s, v_{p}/v_{s}=
2**

**model 06 :** **v _{p}=2000,
v_{s}=1153 m/s, v_{p}/v_{s}=
1.73 ( =SQRT(3) )**

**model 07 :** **v _{p}=2000,
v_{s}=1400 m/s, v_{p}/v_{s}=
1.42 ( This is just formal, not physical value of ratio ! )**

`The results of FDFE (finite-element finite-differences) hybrid
method of Moczo et al. (1997) for the ridge model were kindly provided
by J. Kristek (Geophys. Inst., Slovak Academy of Sciences, Bratislava,
Slovakia). `

The computed data, postscript figures,
explanation, etc. are available free
**ON DEMAND**

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