Reference tau-p
Specifies the table from which the reference tau(p) curve is obtained.
The reference curve is used to fill the gaps in the observed curves. If this list is not used, the reference curve is derived from the initial 3D model itself (this 3D option not implemented yet, so better USE the REFTAUP list)
If this list is not used, the reference travel times are deived for each of the travel-time curves individually, using the current 3D velocity model.
| Usage: | REFTAUP | P TAU TABLE |
P |
Name of argument containing the values of ray parameter |
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TAU |
Name of entry containing the values of intercept time |
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TABLE |
Name of table containg the reference tau-p curve. |
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Smoothing
Defines additional grids used for smoothing layer thickness
| Usage: | SMOOTH | TTCURVE COORDS P TAU TABLE |
TTCURVE |
Name of travel time curve to which the segment provided in the table belongs. This name may be provided in the parameters or entries of the tables themselves. |
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COORDS |
Name of a 4-component entry containing the source and receiver coordintes. The coordinates should be mapped in the following order: shot X, shot Y, receiver X, receiver Y. |
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P |
Name of the argument containing the values of ray parameter |
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TAU |
Name of the entry containing the values of intercept time |
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TABLE |
Name of the table. |
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Source
Propagate travel times from a surface source point. The travel times are stored in the same map as the velocity model.
| Usage: | SOURCE | X Y MAXDX MAXDY MULTX MULTY TSTART T |
X |
X-coordinate of the source |
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Y |
Y-coordinate of the source |
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MAXDX |
Maximum X-offset included in tracing, in grid increments. Travel times are computed within a box of [-MAXDX,MAXDX] grid increments centered on the source cell. Negative values interpreted as "no limit".. DEF: No limit; |
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MAXDY |
Maximum Y-offset included in tracing, in grid increments. Travel times are computed within a box of [-MAXDY,MAXDY] grid increments, centered on the source cell. Negative values interpreted as "no limit".. DEF: No limit; |
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MULTX |
Number of travel-time nodes along the X axis per node of the model. |
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MULTY |
Number of travel-time nodes along the Y axis per node of the model. |
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TSTART |
Stating time at the source (e.g., static) |
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T |
Name of a header entry in the target map (defined in list VELMOD) into which the values of travel times will be written. If this entry is not present in the target map, it will be added to it . |
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Summary
Prints model or data summary in a file.
| Usage: | SUMMARY | ITEM LEVEL FNAME |
ITEM |
Item being summarized |
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LEVEL |
Level of detal provided in the summary |
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FNAME |
Output file name. "*" denotes the current log file. |
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Tau-p
Specifies the table from which the tau(p) function are obtained
| Usage: | TAUP | TTCURVE COORDS P TAU TABLE |
TTCURVE |
Name of travel time curve to which the segment provided in the table belongs. This name may be provided in the parameters or entries of the tables themselves. |
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COORDS |
Name of a 4-component entry containing the source and receiver coordintes. The coordinates should be mapped in the following order: shot X, shot Y, receiver X, receiver Y. |
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P |
Name of the argument containing the values of ray parameter |
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TAU |
Name of the entry containing the values of intercept time |
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TABLE |
Name of the table. |
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Specifies the ranges of ray parameters and/or offsets for which the travel-time segment is used
XMIN |
Minimum offset in the segment |
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XMAX |
Maximum offset in the segment |
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PMIN |
Minimum ray parameter in the segment |
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PMAX |
Maximum ray parameter in the segment |
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Travel times
Propagate travel times from a surface source point. Surface travel times are stored in a separate 2D map.
| Usage: | TTIMES | XSRC YSRC TSTART X Y T TABLE |
XSRC |
X-coordinate of the source |
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YSRC |
Y-coordinate of the source |
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TSTART |
Start time at the source (e.g., static) |
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X |
X-coordinate of the receiver (normally, taken from the target TT map named TABLE below. |
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Y |
Y-coordinate of the receiver (normally, taken from the target TT map named TABLE below. |
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T |
Name of a header entry in the target map into which the values of travel times will be written. If this entry is not present in the target map, it will be added to it . |
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TABLE |
Name of the map to take the coordinates from and to store the times. |
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Velocity model
Creates a 3D velocity model map V(x,y,z)
| Usage: | VELMOD | X Y Z DZ NZ V TABLE |
X |
Name of argument (X-coordinate) in the velocity map. |
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Y |
Name of argument (Y-coordinate) in the velocity map. |
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Z |
Name of argument (Z-coordinate) in the velocity map. |
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DZ |
Depth increment within the velocity map. (The minimum depth equals 0). |
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NZ |
Number of depth nodes within the velocity map. |
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V |
Name of the entry (velocity) in the velocity map. |
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TABLE |
Name of the output table. This table will be created by the program |
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