view release on metacpan or  search on metacpan

lib/App/SeismicUnixGui/developer/Stripped/inversion/suinvco3d.3D.Suinvco3d  view on Meta::CPAN

 com_type=		computation type, determines what tables are needed	
			1 ---- only needs traveltime,	   weight=1.0		
			2 ---- traveltime, propagation angles,  weight=ctheta	
			3 ---- traveltime, angle and amplitude,			
						  weight = det/as/ag/(1+ctheta)	
 nzt=		   number of z samples (1st dimension) in traveltime		
 nxt=		   number of x samples (2nd dimension) in traveltime		
 nyt=		   number of y samples (3rd dimension) in traveltime		
 tfile=		  file containing traveltime array t[nyt][nxt][nzt]		
 ampfile		file containing amplitude array amp[nyt][nxt][nzt]	
 d21file=		file containing Beylkin determinant component array	
 d22file=		file containing Beylkin determinant component array	
 d23file=		file containing Beylkin determinant component array	
 d31file=		file containing Beylkin determinant component array	
 d32file=		file containing Beylkin determinant component array	
 d33file=		file containing Beylkin determinant component array	
 a1file=		 file containing ray propagation angle (polar) array	
 b1file=		 file containing ray propagation angle (azimuth) array	

 Optional Parameters:								
 dt= or from header (dt) 	time sampling interval of input data		
 offs= or from header (offset) 	source-receiver offset 			
 dxm= or from header (d2) 	x sampling interval of midpoints 		
 fxm=0		  first midpoint in input trace					
 dym=50.0		y sampling interval of midpoints 			
 fym=0		  y-coordinate of first midpoint in input trace			
 nxv=		   number of x samples (2nd dimension) in velocity		
 nyv=		   number of y samples (3rd dimension) in velocity		
 dxv=50.0		x sampling interval of velocity				
 fxv=0.0		first x sample of velocity				
 dyv=50.0		y sampling interval of velocity				
 fyv=0.0		first y sample of velocity				
 dzv=50.0		z sampling interval of velocity				
 fzv=0.0		first z sample of velocity				
 nxb=nx/2		band centered at midpoints (see note)			
 fxo=0.0		x-coordinate of first output trace 			
 dxo=15.0		horizontal spacing of output trace 			
 nxo=101		number of output traces 				",	
 fyo=0.0		y-coordinate of first output trace			
 dyo=15.0		y-coordinate spacing of output trace			
 nyo=101		number of output traces in y-direction			
 fzo=0.0		z-coordinate of first point in output trace 		
 dzo=15.0		vertical spacing of output trace 			
 nzo=101		number of points in output trace			",	
 dxt=100.0		x-coordinate spacing of input tables(traveltime, etc)	
 dyt=100.0		y-coordinate spacing of input tables(traveltime, etc)	
 dzt=100.0		z-coordinate spacing of input tables(traveltime, etc)	
 xt0=0.0		x-coordinate of first input tables			
 xt1=0.0		x-coordinate of last input tables			
 yt0=0.0		y-coordinate of first input tables		 	
 yt1=0.0		y-coordinate of last input tables			
 fmax=0.25/dt		Maximum frequency set for operator antialiasing		
 ang=180		Maximum dip angle allowed in the image			
 apet=45		aperture open angle for summation			
 alias=0		=1 to set the anti-aliasing filter			
 verbose=1		=1 to print some useful information			

 Notes:									

 The information needed in the computation of the weighting factor		
 in Kirchhoff inversion formula includes traveltime, amplitude, 		
 and Beylkin determinant at each grid point for each source/receiver		
 point. For a 3-D nonzero common-offset inversion, the Beylkin			
 determinant is computed from a 3x3 matrix with each element 			
 containing a sum of quantities from the source and the receiver.		
 The nine elements in the Beylkin matrix for each source/receiver		
 can be determined by eight quantities. These quantities can be		
 computed by the dynamic ray tracer. Tables of traveltime, amplitude,		
 and Beylkin matrix elements from each source and receiver are			
 pre-computed and stored in files.						

 For each trace, tables of traveltime, amplitude and Beylkin matrix		
 at the source and receiver location are input or interpolated from		
 neighboring tables. For the computation of weighting factor, linear		
 interpolation is used to determine the weighting factor at each		
 output grid point, and weighted diffraction summation is then 		
 applied. For each midpoint, the traveltimes and weight factors are		
 calculated in the horizontal range of (xm-nxb*dx-z*tan(apet),			
 xm+nxb*dx+z*tan(apet)).							

 Offsets are signed - may be positive or negative. 				", 



 This algorithm is based on the inversion formulas in chaper 5 of
 _Mathematics of Multimensional Seismic Migration, Imaging and Inversion_ 
 (Springer-Verlag, 2000), by Bleistein, N., Cohen, J.K.
 and Stockwell, Jr., J. W.