READ_EXPL.f90

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!    Copyright (C) 2012 The SPEED FOUNDATION
!    Author: Ilario Mazzieri
!
!    This file is part of SPEED.
!
!    SPEED is free software; you can redistribute it and/or modify it
!    under the terms of the GNU Affero General Public License as
!    published by the Free Software Foundation, either version 3 of the
!    License, or (at your option) any later version.
!
!    SPEED is distributed in the hope that it will be useful, but
!    WITHOUT ANY WARRANTY; without even the implied warranty of
!    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
!    Affero General Public License for more details.
!
!    You should have received a copy of the GNU Affero General Public License
!    along with SPEED.  If not, see <http://www.gnu.org/licenses/>.
 
 
      subroutine read_expl(Xipo,Yipo,Zipo, &                       
                                 X1,Y1,Z1, &                               
                                 X2,Y2,Z2, &                               
                                 X3,Y3,Z3, &                               
                                 nnod,xs,ys,zs, &                       
                                 num_ne,sour_ne,i,&                       
                                 dist_sour_ne,nl_expl,&               
                                 max_num_ne, loc_n_num, nn_loc)        
                                                        
 
      implicit none
      
      integer*4 :: nnod,node_expl,num_ne,nl_expl,max_num_ne, nn_loc
      integer*4 :: i,isn
      
      integer*4, dimension(nn_loc) :: loc_n_num(nn_loc)
 
      integer*4, dimension(max_num_ne,nl_expl) :: sour_ne
 
      real*8 :: xipo,yipo,zipo,x1,y1,z1,x2,y2,z2,x3,y3,z3,ux,uy,uz,vx,vy,vz,tol
      real*8 :: xmax,xmin,ymax,ymin,zmax,zmin,a,b,c
      real*8 :: den
 
      real*8, dimension(nn_loc) :: xs,ys,zs
 
      real*8, dimension(max_num_ne,nl_expl) :: dist_sour_ne
 
      node_expl = 0
      tol = 5.0d0
      
      ux=(x1-x2)/sqrt((x1-x2)**2+(y1-y2)**2+(z1-z2)**2)
      uy=(y1-y2)/sqrt((x1-x2)**2+(y1-y2)**2+(z1-z2)**2)
      uz=(z1-z2)/sqrt((x1-x2)**2+(y1-y2)**2+(z1-z2)**2)
      vx=(x3-x2)/sqrt((x3-x2)**2+(y3-y2)**2+(z3-z2)**2)
      vy=(y3-y2)/sqrt((x3-x2)**2+(y3-y2)**2+(z3-z2)**2)
      vz=(z3-z2)/sqrt((x3-x2)**2+(y3-y2)**2+(z3-z2)**2)
      
      a = uy * vz - uz * vy 
      b = uz * vx - ux * vz
      c = ux * vy - uy * vx
          den = sqrt(a**2 + b**2 + c**2)
 
         !Check on the relative position of fault end points
         !In this preliminary part we check if P1 point is the lower-left fault point or not
         !If this check would fail the two points are swapped
  
         
         xmax=max(x1,x2,x3)+tol
         xmin=min(x1,x2,x3)-tol
         ymax=max(y1,y2,y3)+tol
         ymin=min(y1,y2,y3)-tol
         zmax=max(z1,z2,z3)+tol
         zmin=min(z1,z2,z3)-tol
         
 
         do isn = 1,nnod
 
            if ( dabs( a*(xs(isn)-x1) + b*(ys(isn)-y1) + c*(zs(isn)-z1)/den ).le.tol) then
                if ((xs(isn).ge.xmin).and.(xs(isn).le.xmax)) then
                      if ((ys(isn).ge.ymin).and.(ys(isn).le.ymax)) then
                        if ((zs(isn).ge.zmin).and.(zs(isn).le.zmax)) then
 
                            node_expl = node_expl + 1   
                            sour_ne(node_expl,i) = loc_n_num(isn)
                            dist_sour_ne(node_expl,i) = sqrt((xipo - xs(isn))**2 + (yipo - ys(isn))**2 + (zipo - zs(isn))**2)
                      
                        endif
                      endif
                 endif
            endif
             
         enddo
 
     
      return
      end subroutine read_expl