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Taiwan: Migration

January 01, 2005


Below is the user area of for the Taiwan data.

  • Remember, cdpmin and cdpmax refer to the range of CMPs that will have DMO applied to them. Previously, we decided that we will always let sustolt apply DMO to all stack traces (Section 9.2.1).

  • The CDP bin distance, provided to us with the data files, is 16.667 m (parameter dxcdp, line 22).

  • Because we do not know rms velocities for these data, we set vscale=1.0 (line25). We process for image, not for velocities.

  • Our first velocity is 1000 m/s and our last is 4000 m/s. Our velocity increment is 100 m/s. Here, we choose a large velocity range because we think the migration changes will be subtle.

The output of is 31 constant velocity migration panels, 128 Mbytes.

Below is script for the Taiwan data. We set loop=1 (line 12) to run the movie forward continuously. Below, fframe=1000 and dframe=100 because we re-ran the migration ( for velocities 1000-4000 m/s at 100 m/s increment.

Below is the surange output of Several facts from this output are useful for supplying values to On line 21, you have to supply the number of time samples – the value of key ns. On line 17, you have to supply the time sample interval – the value of key dt.

The panel velocities are in the offset key and the number of velocities is in the nvs key. Using these two keys, you can calculate the values for fframe

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Society of Exploration Geophysicists Course Notes

Seismic Data Processing with Seismic Un*x: A 2D Seismic Data Processing Primer

David Forel
David Forel
Michigan Technological University
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Thomas Benz
Thomas Benz
Michigan Technological University
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Wayne D. Pennington
Wayne D. Pennington
Michigan Technological University
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Society of Exploration Geophysicists
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Publication date:
January 01, 2005




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