Sample computations in the model 98

Petr Bulant & Ludek Klimes

The sample synthetic model named "98" was created during the technical session of the SW3D consortium meeting in June 1998. The aim of the work done was not to create a realistic model, but to demonstrate capabilities of program packages MODEL and CRT. The participants of the meeting were asked how should the model look like and which computations should be performed. The data and MS-DOS batch files for the computations were prepared just during the session. It was thus a good opportunity to learn a lot about both the program packages.

Model

The model 98 is composed of three layers separated by two interfaces. The upper interface is curved, the lower one is formed by dipping plane. A salt body in the middle layer is bounded by spherical interface. Here you can see the 3-D picture of the model (14 kB). Look also at the description of the data file 98-mod.dat, which is an input data file for the MODEL package. The file 98-mod.dat was prepared by manually editing file model.dat.

Computations

Following computations were managed by history files. They were tested on PC under MS DOS, on PC under LINUX and on HP workstation under HP UNIX. We used version 5.20 (i.e. version from SW3D-CD-2) of all the programs.

Travel-time computation

Seismogram generation

Table of the history files, data files, executables and resulting figures

History file: Data files: Executables needed: Resulting PostScript figures:
Computation of P and S wave velocity cross-sections: 
98-grd.h 98-mod.dat grdps 98-vel?.ps
Travel-time computation:
98-mtt.h 98-crt1.dat crt 98-tt0??.ps
98-mod.dat grdps 98-tt1??.ps
98-rec.dat mgrd
98-rpa1.dat mtt
98-src.dat mttgrd
writall.dat
Synthetic seismograms generation: 
98-ss.h 98-crt2.dat crt 98-sst?.ps
98-mod.dat green 98-ssf?.ps
98-rec.dat greenss 98-ssb?.ps
98-rpa2.dat sp 98-sse?.ps
98-src.dat ss
source.dat
writ.dat
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