/ 
App-SeismicUnixGui-0.87.2
River stage zero No dependents
/ App::SeismicUnixGui::sunix::NMO_Vel_Stk::sucvs4fowler

SYNOPSIS

PERL PROGRAM NAME:

AUTHOR: Juan Lorenzo (Perl module only)

DATE:

DESCRIPTION:

Version:

USE

NOTES

Examples

SYNOPSIS

SEISMIC UNIX NOTES SUCVS4FOWLER --compute constant velocity stacks for input to Fowler codes

 Required Parameter:							

 ncdps=		number of input cdp gathers			

 Optional Parameters:							

 vminstack=1500.	minimum velocity panel in m/s to output		

 nvstack=180		number of stacking velocity panels to compute	

			( Let offmax be the maximum offset, fmax be	

			the maximum freq to preserve, and tmute be	

			the starting mute time in sec on offmax, then	

			the recommended value for nvstack would be	

			nvstack = 4 +(offmax*offmax*fmax)/(0.6*vmin*vmin*tmute)

			---you may want to make do with less---)		

 lmute=24		length of mute taper in ms			

 nonhyp=1		1 if do mute at 2*offset/vhyp to avoid		

			non-hyperbolic moveout, 0 otherwise		

 vhyp=2500.		velocity to use for non-hyperbolic moveout mute	

 lbtaper=0		length of bottom taper in ms			

 lstaper=0		length of side taper in traces			

 dtout=1.5*dt		output sample rate in s,			

			note: typically fmax=salias*0.5/dtout		

 mxfold=120		maximum number of offsets/input cmp		

 salias=0.8		fraction of output frequencies to force within sloth

			antialias limit.  This controls muting by offset of

			the input data prior to computing the cv stacks	

			for values of choose=1 or choose=2.		

 Required trace header words on input are ns, dt, cdp, offset.		







 Author:  (Visitor to CSM from Mobil): John E. Anderson, Spring 1994

 

	References:



	Fowler, P., 1988, Ph.D. Thesis, Stanford University.

	Anderson, J.E., Alkhalifah, T., and Tsvankin, I., 1994, Fowler

		DMO and time migration for transversely isotropic media,

		1994 CWP project review

User's notes (Juan Lorenzo) untested

CHANGES and their DATES

Import packages

instantiation of packages

Encapsulated hash of private variables

sub Step

collects switches and assembles bash instructions by adding the program name

sub note

collects switches and assembles bash instructions by adding the program name

sub clear

sub choose

sub dtout

sub fmax

sub lbtaper

sub lmute

sub lstaper

sub mxfold

sub ncdps

sub nonhyp

sub nvstack

sub salias

sub vhyp

sub vminstack

sub get_max_index

max index = number of input variables -1