SUMMARY

Increments properties for files in the stack file list.

SYNTAX

[I]NCREMENT[S]TACK

DEFAULTS VALUES

All property INCREMENT values are initially 0.

DESCRIPTION

The properties that can be incremented are the static time delay, the apparent velocity, and the velocity model intercept time. Property increment values of 0. obviously leave those properties unchanged. The apparent velocity or the velocity model intercept time can be incremented, and the other one calculated in order to maintain a zero delay at a specified point.

EXAMPLES

An example of the use of this command to INCREMENT static time delays is shown in the ADDSTACK command. An example of the use of this command to increment dynamic delays is given below::

SAC> ADDSTACK FILEA
SAC> ADDSTACK FILEB
SAC> ADDSTACK FILEC
SAC> ADDSTACK FILED
SAC> VELOCITYMODEL 1 REFR VAPP 7.9 VAPPI 0.1 T0VM CALC DIST 320. TVM 45.
SAC> SUMSTACK
SAC> WRITESTACK STACK1
SAC> INCREMENTSTACK
SAC> SUMSTACK
SAC> WRITESTACK STACK2
SAC> INCREMENTSTACK
SAC> SUMSTACK
SAC> WRITESTACK STACK3

The above commands will produce three summations, the results being stored in SAC files STACK1, STACK2, and STACK3. The refracted wave velocity model is used and the apparent velocities, VAPP are 7.9, 8.0 and 8.1 respectively. The velocity model intercept time, T0VM, is calculated in each case to maintain a zero delay at the point 320. km and 45. seconds.

SEE COMMANDS

VELOCITYMODEL