cvnmo.m

著名的seismiclab的代码 是地震学研究人员必备的工具

function [D_out] = cvnmo(D_in,offset,dt,v,conj);  
%CVNMO: Apply constant velocity NMO and NMO^{-1} correction 
%
%  [D_out] = cvnmo(D_in,offset,dt,v,conj)
%
%  IN   D_in:   data to NMO or un-NMO
%       offset: source-receicer distance in meters
%       dt:     sampling in secs
%       v:      velocity in m/sec 
%       conj:   flag to    NMO conj=1
%       conj:   flag to un-NMO conj=-1
%
%  OUT  D_out: output data after NMO or un-NMO
%
%
%  SeismicLab
%  Version 1
%
%  written by M.D.Sacchi, last modified December 10, 1998.
%  [e-mail] 
% 
%  Copyright (C) 1998 Seismic Processing and Imaging Group 
%                     Department of Physics
%                     The University of Alberta 
%
%

[nt,nh]=size(D_in);
D_out=zeros(nt,nh);

n=1:1:nt;

for k=1:nh
 d=sqrt( ((n-1)*dt).^2+(offset(k)/v)^2);
 nn=floor(d/dt)+1; 
if conj == 1;   
  for kk=1:nt
   if nn(kk)<nt; D_out(n(kk),k) = D_in(nn(kk),k);end;
  end
  end
if conj ==-1;   
  for kk=1:nt
   if nn(kk)<nt; D_out(nn(kk),k) = D_in(n(kk),k);end;
  end
 end
 end


 
return