IFOS2D.c 242 KB
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/*-----------------------------------------------------------------------------------------
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 * Copyright (C) 2016  For the list of authors, see file AUTHORS.
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 *
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 * This file is part of IFOS.
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 *
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 * IFOS is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2.0 of the License only.
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 *
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 * IFOS is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with IFOS. See file COPYING and/or <http://www.gnu.org/licenses/gpl-2.0.html>.
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 -----------------------------------------------------------------------------------------*/
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/* ----------------------------------------------------------------------
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 * This is program IFOS.
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 * Inversion of Full Observerd Seismograms
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 *
 *  ----------------------------------------------------------------------*/
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#include "fd.h"           /* general include file for viscoelastic FD programs */

#include "globvar.h"      /* definition of global variables  */
#include "cseife.h"

#include "stfinv/stfinv.h" /* libstfinv - inversion for source time function */

int main(int argc, char **argv){
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    /* variables in main */
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    int ns, nseismograms=0, nt, nd, fdo3, j, i, iter, h, infoout, SHOTINC,  hin, hin1, do_stf=0;
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    int NTDTINV, nxny, nxnyi, imat, imat1, imat2, IDXI, IDYI, hi, NTST, NTSTI;
    int lsnap, nsnap=0, lsamp=0, buffsize,  swstestshot, snapseis, snapseis1;
    int ntr=0, ntr_loc=0, ntr_glob=0, nsrc=0, nsrc_loc=0, nsrc_glob=0, ishot, irec, nshots=0, nshots1, Lcount, itest, itestshot;
    
    float muss, lamss;
    float memdyn, memmodel, memseismograms, membuffer, memtotal, eps_scale;
    float fac1, fac2;
    float opteps_vp, opteps_vs, opteps_rho, Vp_avg, C_vp, Vs_avg, C_vs, rho_avg, C_rho;
    float memfwt, memfwt1, memfwtdata;
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    char *buff_addr, ext[10], *fileinp;
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    char jac[225];
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    double time1, time2, time3, time4, time5, time6, time7, time8,
    time_av_v_update=0.0, time_av_s_update=0.0, time_av_v_exchange=0.0,
    time_av_s_exchange=0.0, time_av_timestep=0.0;
    
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    float L2, L2sum, L2_all_shots, L2sum_all_shots, *L2t, alphanom, alphadenom;
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    int sum_killed_traces=0, sum_killed_traces_testshots=0, killed_traces=0, killed_traces_testshots=0;
    int *ptr_killed_traces=&killed_traces, *ptr_killed_traces_testshots=&killed_traces_testshots;
    
    float energy, energy_sum, energy_all_shots, energy_sum_all_shots;
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    float energy_SH, energy_sum_SH, energy_all_shots_SH, energy_sum_all_shots_SH;
    float L2_SH, L2sum_SH, L2_all_shots_SH, L2sum_all_shots_SH;
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    // Pointer for dynamic wavefields:
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    float  **  psxx, **  psxy, **  psyy, **  psxz, **  psyz, **psp, ** ux, ** uy, ** uxy, ** uyx, ** Vp0, ** uttx, ** utty, ** Vs0, ** Rho0;
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    float  **  pvx, **  pvy, **  pvz, **waveconv, **waveconv_lam, **waveconv_mu, **waveconv_rho, **waveconv_rho_s, **waveconv_u, **waveconvtmp, **wcpart, **wavejac,**waveconv_rho_s_z,**waveconv_u_z,**waveconv_rho_z;
    float **waveconv_shot, **waveconv_u_shot, **waveconv_rho_shot, **waveconv_u_shot_z, **waveconv_rho_shot_z;
    float  **  pvxp1, **  pvyp1, **  pvzp1, **  pvxm1, **  pvym1, **  pvzm1;
    float ** gradg, ** gradp,** gradg_rho, ** gradp_rho, ** gradg_u, ** gradp_u, ** gradp_u_z,** gradp_rho_z;
    float  **  prho,**  prhonp1, **prip=NULL, **prjp=NULL, **pripnp1=NULL, **prjpnp1=NULL, **  ppi, **  pu, **  punp1, **  puipjp, **  ppinp1;
    float  **  vpmat, ***forward_prop_x, ***forward_prop_y, ***forward_prop_rho_x, ***forward_prop_u, ***forward_prop_rho_y, ***forward_prop_p;
    
    float ***forward_prop_z_xz,***forward_prop_z_yz,***forward_prop_rho_z,**waveconv_mu_z;
    float ** uxz, ** uyz;
    
    float  ** sectionvx=NULL, ** sectionvy=NULL, ** sectionvz=NULL, ** sectionp=NULL, ** sectionpnp1=NULL,
    ** sectioncurl=NULL, ** sectiondiv=NULL, ** sectionvxdata=NULL, ** sectionvydata=NULL, ** sectionvzdata=NULL, ** sectionvxdiff=NULL, ** sectionvzdiff=NULL, ** sectionvxdiffold=NULL, ** sectionvydiffold=NULL, ** sectionvzdiffold=NULL,** sectionpdata=NULL, ** sectionpdiff=NULL, ** sectionpdiffold=NULL,
    ** sectionvydiff=NULL, ** sectionpn=NULL, ** sectionread=NULL, ** sectionvy_conv=NULL, ** sectionvy_obs=NULL, ** sectionvx_conv=NULL,** sectionvx_obs=NULL, ** sectionvz_conv=NULL,** sectionvz_obs=NULL,
    ** sectionp_conv=NULL,** sectionp_obs=NULL, * source_time_function=NULL;
    float  **  absorb_coeff, ** taper_coeff, * epst1, * epst2,  * epst3, * picked_times;
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    float  ** srcpos=NULL, **srcpos_loc=NULL, ** srcpos1=NULL, **srcpos_loc_back=NULL, ** signals=NULL,** signals_SH=NULL,  *hc=NULL;
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    int   ** recpos=NULL, ** recpos_loc=NULL;
    /*int   ** tracekill=NULL, TRKILL, DTRKILL;*/
    int * DTINV_help;
    
    float ** bufferlef_to_rig,  ** bufferrig_to_lef, ** buffertop_to_bot, ** bufferbot_to_top;
    
    /* PML variables */
    float * d_x, * K_x, * alpha_prime_x, * a_x, * b_x, * d_x_half, * K_x_half, * alpha_prime_x_half, * a_x_half, * b_x_half, * d_y, * K_y, * alpha_prime_y, * a_y, * b_y, * d_y_half, * K_y_half, * alpha_prime_y_half, * a_y_half, * b_y_half;
    float ** psi_sxx_x, ** psi_syy_y, ** psi_sxy_y, ** psi_sxy_x, ** psi_vxx, ** psi_vyy, ** psi_vxy, ** psi_vyx, ** psi_vxxs;
    float ** psi_sxz_x, ** psi_syz_y, ** psi_vzx, ** psi_vzy;
    
    /* Variables for viscoelastic modeling */
    float **ptaus=NULL, **ptaup=NULL, *etaip=NULL, *etajm=NULL, *peta=NULL, **ptausipjp=NULL, **fipjp=NULL, ***dip=NULL, *bip=NULL, *bjm=NULL;
    float *cip=NULL, *cjm=NULL, ***d=NULL, ***e=NULL, ***pr=NULL, ***pp=NULL, ***pq=NULL, **f=NULL, **g=NULL;
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    float ***pt=NULL, ***po=NULL; // SH Simulation
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    /* Variables for step length calculation */
    int step1, step2, step3=0, itests, iteste, stepmax, countstep;
    float scalefac;
    
    int RECINC, ntr1;
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    int SOURCE_SHAPE_OLD=0;
    int SOURCE_SHAPE_OLD_SH=0;
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    /* Variables for L-BFGS */
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    int LBFGS_NPAR=3;
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    int LBFGS_iter_start=1;
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    float **s_LBFGS,**y_LBFGS, *rho_LBFGS;
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    int l=0;
    int m=0;
    
    /* Check wolfe */
    int steplength_search=0;
    int FWI_run=1;
    int gradient_optimization=1;
    float alpha_SL_min=0, alpha_SL_max=0, alpha_SL=1.0;
    float alpha_SL_old;
    float ** waveconv_old,** waveconv_u_old,** waveconv_rho_old;
    float ** waveconv_up,** waveconv_u_up,** waveconv_rho_up;
    float L2_SL_old=0, L2_SL_new=0;
    float c1_SL=1e-4, c2_SL=0.9;
    int wolfe_status;
    int wolfe_sum_FWI=0;
    int wolfe_found_lower_L2=0;
    float alpha_SL_FS;
    float L2_SL_FS;
    int use_wolfe_failsafe=0;
    int wolfe_SLS_failed=0;
    
    /* Variables for energy weighted gradient */
    float ** Ws, **Wr, **We;
    float ** Ws_SH, **Wr_SH, **We_SH;
    float ** We_sum,** We_sum_SH;
    float We_sum_max1;
    float We_max_SH,We_max;
    
    int * recswitch=NULL;
    float ** fulldata=NULL, ** fulldata_vx=NULL, ** fulldata_vy=NULL, ** fulldata_vz=NULL, ** fulldata_p=NULL, ** fulldata_curl=NULL, ** fulldata_div=NULL;
    
    /*vector for abort criterion*/
    float * L2_hist=NULL;
    
    /* help variable for MIN_ITER */
    int min_iter_help=0;
    
    float ** workflow=NULL;
    int workflow_lines;
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    char workflow_header[STRING_SIZE];
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    int change_wavetype_iter=-10; /* Have to be inialized negative */
    int wavetype_start; /* We need this due to MPI Comm */
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    int buf1=0, buf2=0;
    WORKFLOW_STAGE=1;
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    /* variable for time domain filtering */
    float FC;
    float *FC_EXT=NULL;
    int nfrq=0;
    int FREQ_NR=1;
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    FILE *fprec, *FPL2;
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    /* General parameters */
    int nt_out;
    
    MPI_Request *req_send, *req_rec;
    MPI_Status  *send_statuses, *rec_statuses;
    
    /* Initialize MPI environment */
    MPI_Init(&argc,&argv);
    MPI_Comm_size(MPI_COMM_WORLD,&NP);
    MPI_Comm_rank(MPI_COMM_WORLD,&MYID);
    
    setvbuf(stdout, NULL, _IONBF, 0);
    
    if (MYID == 0){
        time1=MPI_Wtime();
        clock();
    }
    
    /* print program name, version etc to stdout*/
    if (MYID == 0) info(stdout);
    
    /* read parameters from parameter-file (stdin) */
    fileinp=argv[1];
    FP=fopen(fileinp,"r");
    if(FP==NULL) {
        if (MYID == 0){
            printf("\n==================================================================\n");
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            printf(" Cannot open IFOS input file %s \n",fileinp);
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            printf("\n==================================================================\n\n");
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            declare_error(" --- ");
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        }
    }
    
    /* read json formatted input file */
    read_par_json(stdout,fileinp);
    
    exchange_par();
    
    wavetype_start=WAVETYPE;
    if (MYID == 0) note(stdout);
    
    
    /* open log-file (each PE is using different file) */
    /*	fp=stdout; */
    sprintf(ext,".%i",MYID);
    strcat(LOG_FILE,ext);
    
    /* If Verbose==0, no PE will write a log file */
    if(!VERBOSE) sprintf(LOG_FILE,"/dev/null");
    
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    if ((MYID==0)) FP=stdout;
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    else {
        FP=fopen(LOG_FILE,"w");
    }
    fprintf(FP," This is the log-file generated by PE %d \n\n",MYID);
    
    /* domain decomposition */
    initproc();
    
    NT=iround(TIME/DT);  	  /* number of timesteps */
    /*ns=iround(NT/NDT);*/           /* number of samples per trace */
    ns=NT;	/* in a FWI one has to keep all samples of the forward modeled data
             at the receiver positions to calculate the adjoint sources and to do
             the backpropagation; look at function saveseis_glob.c to see that every
             NDT sample for the forward modeled wavefield is written to su files*/
    lsnap=iround(TSNAP1/DT);      /* first snapshot at this timestep */
    lsamp=NDT;
    
    
    /* output of parameters to log-file or stdout */
    if (MYID==0) write_par(FP);
    
    
    /* NXG, NYG denote size of the entire (global) grid */
    NXG=NX;
    NYG=NY;
    
    /* In the following, NX and NY denote size of the local grid ! */
    NX = IENDX;
    NY = IENDY;
    
    
    if (SEISMO){
        recpos=receiver(FP, &ntr);
        recswitch = ivector(1,ntr);
        recpos_loc = splitrec(recpos,&ntr_loc, ntr, recswitch);
        ntr_glob=ntr;
        ntr=ntr_loc;
    }
    
    /* memory allocation for abort criterion*/
    L2_hist = vector(1,1000);
    
    if(INV_STF) fulldata = matrix(1,ntr_glob,1,NT);
    
    /* estimate memory requirement of the variables in megabytes*/
    
    switch (SEISMO){
        case 1 : /* particle velocities only */
            nseismograms=2;
            break;
        case 2 : /* pressure only */
            nseismograms=1;
            break;
        case 3 : /* curl and div only */
            nseismograms=2;
            break;
        case 4 : /* everything */
            nseismograms=5;
            break;
        case 5 : /* everything except curl and div */
            nseismograms=3;
            break;
    }
    
    /* use only every DTINV time sample for the inversion */
    /*DTINV=15;*/
    DTINV_help=ivector(1,NT);
    NTDTINV=ceil((float)NT/(float)DTINV);		/* round towards next higher integer value */
    
    /* save every IDXI and IDYI spatial point during the forward modelling */
    IDXI=1;
    IDYI=1;
    
    /*allocate memory for dynamic, static and buffer arrays */
    fac1=(NX+FDORDER)*(NY+FDORDER);
    fac2=sizeof(float)*pow(2.0,-20.0);
    
    nd = FDORDER/2 + 1;
    
    // decide how much space for exchange is needed
    switch (WAVETYPE) {
        case 1:
            fdo3 = 2*nd;
            break;
        case 2:
            fdo3 = 1*nd;
            break;
        case 3:
            fdo3 = 3*nd;
            break;
        default:
            fdo3 = 2*nd;
            break;
    }
    
    
    if (L){
        memdyn=(5.0+3.0*(float)L)*fac1*fac2;
        memmodel=(12.0+3.0*(float)L)*fac1*fac2;
        
    } else {
        memdyn=5.0*fac1*fac2;
        memmodel=6.0*fac1*fac2;
    }
    memseismograms=nseismograms*ntr*ns*fac2;
    
    memfwt=5.0*((NX/IDXI)+FDORDER)*((NY/IDYI)+FDORDER)*NTDTINV*fac2;
    memfwt1=20.0*NX*NY*fac2;
    memfwtdata=6.0*ntr*ns*fac2;
    
    membuffer=2.0*fdo3*(NY+NX)*fac2;
    buffsize=2.0*2.0*fdo3*(NX+NY)*sizeof(MPI_FLOAT);
    memtotal=memdyn+memmodel+memseismograms+memfwt+memfwt1+memfwtdata+membuffer+(buffsize*pow(2.0,-20.0));
    
    
    if (MYID==0 && WAVETYPE == 1){
        fprintf(FP,"\n **Message from main (printed by PE %d):\n",MYID);
        fprintf(FP," Size of local grids: NX=%d \t NY=%d\n",NX,NY);
        fprintf(FP," Each process is now trying to allocate memory for:\n");
        fprintf(FP," Dynamic variables: \t\t %6.2f MB\n", memdyn);
        fprintf(FP," Static variables: \t\t %6.2f MB\n", memmodel);
        fprintf(FP," Seismograms: \t\t\t %6.2f MB\n", memseismograms);
        fprintf(FP," Buffer arrays for grid exchange:%6.2f MB\n", membuffer);
        fprintf(FP," Network Buffer for MPI_Bsend: \t %6.2f MB\n", buffsize*pow(2.0,-20.0));
        fprintf(FP," ------------------------------------------------ \n");
        fprintf(FP," Total memory required: \t %6.2f MB.\n\n", memtotal);
    }
    
    
    /* allocate buffer for buffering messages */
    buff_addr=malloc(buffsize);
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    if (!buff_addr) declare_error("allocation failure for buffer for MPI_Bsend !");
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    MPI_Buffer_attach(buff_addr,buffsize);
    
    /* allocation for request and status arrays */
    req_send=(MPI_Request *)malloc(REQUEST_COUNT*sizeof(MPI_Request));
    req_rec=(MPI_Request *)malloc(REQUEST_COUNT*sizeof(MPI_Request));
    send_statuses=(MPI_Status *)malloc(REQUEST_COUNT*sizeof(MPI_Status));
    rec_statuses=(MPI_Status *)malloc(REQUEST_COUNT*sizeof(MPI_Status));
    
    
    /* memory allocation for dynamic (wavefield) arrays */
    if(!ACOUSTIC){
        switch (WAVETYPE) {
            case 1: // P and SV Waves
                psxx =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                psxy =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                psyy =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                break;
                
            case 2: // SH Waves
                psxz =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                psyz =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                break;
                
            case 3: // P, SH and SV Waves
                psxx =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                psxy =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                psyy =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                psxz =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                psyz =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
                break;
        }
    }else{
        psp  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    }
    
    if(GRAD_METHOD==2) {
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        /* Allocate memory for L-BFGS */
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        if(WAVETYPE==2) LBFGS_NPAR=2;
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        s_LBFGS=fmatrix(1,N_LBFGS,1,LBFGS_NPAR*NX*NY);
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        y_LBFGS=fmatrix(1,N_LBFGS,1,LBFGS_NPAR*NX*NY);
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        rho_LBFGS=vector(1,N_LBFGS);
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        for(l=1;l<=N_LBFGS;l++){
            for(m=1;m<=LBFGS_NPAR*NX*NY;m++){
                s_LBFGS[l][m]=0.0;
                y_LBFGS[l][m]=0.0;
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            }
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            rho_LBFGS[l]=0.0;
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        }
    }
    
    if(!ACOUSTIC){
        if(WAVETYPE==1||WAVETYPE==3){
            ux   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            uy   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            uxy  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            uyx  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            uttx   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            utty   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        }
        if(WAVETYPE==2||WAVETYPE==3){
            uxz   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            uyz   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        }
    }
    
    switch (WAVETYPE) {
        case 1: // P and SV Waves
            pvx  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvy  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvxp1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvyp1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvxm1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvym1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            break;
            
        case 2: // SH Waves
            pvz  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvzp1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvzm1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            break;
            
        case 3: // P and SV Waves
            pvx  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvy  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvxp1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvyp1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvxm1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvym1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvz  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvzp1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            pvzm1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            break;
    }
    
    Vp0  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    if(!ACOUSTIC)
        Vs0  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    Rho0  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    
    /* memory allocation for static (model) arrays */
    prho =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    prhonp1 =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    prip =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    prjp =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    pripnp1 =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    prjpnp1 =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    ppi  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    ppinp1  =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    if(!ACOUSTIC){
        pu   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        punp1   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        puipjp   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    }
    vpmat   =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
    
    
    if((EPRECOND==1)||(EPRECOND==3)){
        if(WAVETYPE==1 || WAVETYPE==3) {
            We_sum = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            Ws = matrix(-nd+1,NY+nd,-nd+1,NX+nd); /* total energy of the source wavefield */
            Wr = matrix(-nd+1,NY+nd,-nd+1,NX+nd); /* total energy of the receiver wavefield */
            We = matrix(-nd+1,NY+nd,-nd+1,NX+nd); /* total energy of source and receiver wavefield */
        }
        if(WAVETYPE==2 || WAVETYPE==3) {
            We_sum_SH = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            Ws_SH = matrix(-nd+1,NY+nd,-nd+1,NX+nd); /* total energy of the source wavefield */
            Wr_SH = matrix(-nd+1,NY+nd,-nd+1,NX+nd); /* total energy of the receiver wavefield */
            We_SH = matrix(-nd+1,NY+nd,-nd+1,NX+nd); /* total energy of source and receiver wavefield */
        }
    }
    
    if (L) {
        /* dynamic (wavefield) arrays for viscoelastic modeling */
        pr = f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,L);
        pp = f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,L);
        pq = f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,L);
        /* memory allocation for static arrays for viscoelastic modeling */
        dip = f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,L);
        d =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,L);
        e =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,L);
        ptaus =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        ptausipjp =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        if(WAVETYPE==2 || WAVETYPE==3) {
            pt = f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,L);
            po = f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,L);
        }
        ptaup =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        fipjp =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        f =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        g =  matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        peta =  vector(1,L);
        etaip =  vector(1,L);
        etajm =  vector(1,L);
        bip =  vector(1,L);
        bjm =  vector(1,L);
        cip =  vector(1,L);
        cjm =  vector(1,L);
    }
    
    /*nf=4;
     nfstart=4;*/
    
    NTST=20;
    NTSTI=NTST/DTINV;
    
    nxny=NX*NY;
    nxnyi=(NX/IDXI)*(NY/IDYI);
    
    /* Parameters for step length calculations */
    stepmax = STEPMAX; /* number of maximum misfit calculations/steplength 2/3*/
    scalefac = SCALEFAC; /* scale factor for the step length */
    
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    if(FORWARD_ONLY==0){
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        waveconv = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        waveconv_lam = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        waveconv_shot = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        
        waveconvtmp = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        wcpart = matrix(1,3,1,3);
        wavejac = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        
        if(!ACOUSTIC){
            forward_prop_x =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
            forward_prop_y =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
        }else{
            forward_prop_p =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
        }
        gradg = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        gradp = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        
        if(WAVETYPE==1 || WAVETYPE==3){
            forward_prop_rho_x =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
            forward_prop_rho_y =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
        }
        if(WAVETYPE==2 || WAVETYPE==3){
            forward_prop_rho_z =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
            forward_prop_z_xz =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
            forward_prop_z_yz =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
            waveconv_rho_shot_z = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            waveconv_u_shot_z = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            waveconv_mu_z = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            waveconv_rho_s_z = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            waveconv_u_z = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            waveconv_rho_z = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            gradp_u_z = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            gradp_rho_z = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        }
        
        gradg_rho = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        gradp_rho = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        waveconv_rho = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        waveconv_rho_s = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        waveconv_rho_shot = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        
        if(WOLFE_CONDITION){
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            c1_SL=WOLFE_C1_SL;
            c2_SL=WOLFE_C2_SL;
            
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            waveconv_old= matrix(-nd+1,NY+nd,-nd+1,NX+nd);
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            if(!ACOUSTIC) waveconv_u_old= matrix(-nd+1,NY+nd,-nd+1,NX+nd);
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            waveconv_rho_old= matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            
            waveconv_up= matrix(-nd+1,NY+nd,-nd+1,NX+nd);
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            if(!ACOUSTIC) waveconv_u_up= matrix(-nd+1,NY+nd,-nd+1,NX+nd);
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            waveconv_rho_up= matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        }
        
        if(!ACOUSTIC){
            forward_prop_u =  f3tensor(-nd+1,NY+nd,-nd+1,NX+nd,1,NT/DTINV);
            gradg_u = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            gradp_u = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            waveconv_u = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            waveconv_mu = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
            waveconv_u_shot = matrix(-nd+1,NY+nd,-nd+1,NX+nd);
        }
        
    }
    
    /* Allocate memory for boundary */
    if(FW>0){
        d_x = vector(1,2*FW);
        K_x = vector(1,2*FW);
        alpha_prime_x = vector(1,2*FW);
        a_x = vector(1,2*FW);
        b_x = vector(1,2*FW);
        
        d_x_half = vector(1,2*FW);
        K_x_half = vector(1,2*FW);
        alpha_prime_x_half = vector(1,2*FW);
        a_x_half = vector(1,2*FW);
        b_x_half = vector(1,2*FW);
        
        d_y = vector(1,2*FW);
        K_y = vector(1,2*FW);
        alpha_prime_y = vector(1,2*FW);
        a_y = vector(1,2*FW);
        b_y = vector(1,2*FW);
        
        d_y_half = vector(1,2*FW);
        K_y_half = vector(1,2*FW);
        alpha_prime_y_half = vector(1,2*FW);
        a_y_half = vector(1,2*FW);
        b_y_half = vector(1,2*FW);
        
        if (WAVETYPE==1||WAVETYPE==3){
            psi_sxx_x =  matrix(1,NY,1,2*FW);
            psi_syy_y =  matrix(1,2*FW,1,NX);
            psi_sxy_y =  matrix(1,2*FW,1,NX);
            psi_sxy_x =  matrix(1,NY,1,2*FW);
            psi_vxx   =  matrix(1,NY,1,2*FW);
            psi_vxxs  =  matrix(1,NY,1,2*FW);
            psi_vyy   =  matrix(1,2*FW,1,NX);
            psi_vxy   =  matrix(1,2*FW,1,NX);
            psi_vyx   =  matrix(1,NY,1,2*FW);
        }
        if(WAVETYPE==2||WAVETYPE == 3 ){
            psi_sxz_x =  matrix(1,NY,1,2*FW);
            psi_syz_y =  matrix(1,2*FW,1,NX);
            psi_vzx   =  matrix(1,NY,1,2*FW);
            psi_vzy   =  matrix(1,2*FW,1,NX);
        }
    }
    
    taper_coeff=  matrix(1,NY,1,NX);
    
    
    /* memory allocation for buffer arrays in which the wavefield
     information which is exchanged between neighbouring PEs is stored */
    bufferlef_to_rig = matrix(1,NY,1,fdo3);
    bufferrig_to_lef = matrix(1,NY,1,fdo3);
    buffertop_to_bot = matrix(1,NX,1,fdo3);
    bufferbot_to_top = matrix(1,NX,1,fdo3);
    
    /* Allocate memory to save full seismograms */
    switch (SEISMO){
        case 1 : /* particle velocities only */
            switch (WAVETYPE) {
                case 1:
                    fulldata_vx = matrix(1,ntr_glob,1,NT);
                    fulldata_vy = matrix(1,ntr_glob,1,NT);
                    break;
                    
                case 2:
                    fulldata_vz = matrix(1,ntr_glob,1,NT);
                    break;
                    
                case 3:
                    fulldata_vx = matrix(1,ntr_glob,1,NT);
                    fulldata_vy = matrix(1,ntr_glob,1,NT);
                    fulldata_vz = matrix(1,ntr_glob,1,NT);
                    break;
            }
            break;
        case 2 : /* pressure only */
            fulldata_p = matrix(1,ntr_glob,1,NT);
            break;
        case 3 : /* curl and div only */
            fulldata_div = matrix(1,ntr_glob,1,NT);
            fulldata_curl = matrix(1,ntr_glob,1,NT);
            break;
        case 4 : /* everything */
            switch (WAVETYPE) {
                case 1:
                    fulldata_vx = matrix(1,ntr_glob,1,NT);
                    fulldata_vy = matrix(1,ntr_glob,1,NT);
                    break;
                    
                case 2:
                    fulldata_vz = matrix(1,ntr_glob,1,NT);
                    break;
                    
                case 3:
                    fulldata_vx = matrix(1,ntr_glob,1,NT);
                    fulldata_vy = matrix(1,ntr_glob,1,NT);
                    fulldata_vz = matrix(1,ntr_glob,1,NT);
                    break;
            }
            fulldata_p = matrix(1,ntr_glob,1,NT);
            fulldata_div = matrix(1,ntr_glob,1,NT);
            fulldata_curl = matrix(1,ntr_glob,1,NT);
            break;
        case 5 : /* everything except curl and div*/
            switch (WAVETYPE) {
                case 1:
                    fulldata_vx = matrix(1,ntr_glob,1,NT);
                    fulldata_vy = matrix(1,ntr_glob,1,NT);
                    break;
                    
                case 2:
                    fulldata_vz = matrix(1,ntr_glob,1,NT);
                    break;
                    
                case 3:
                    fulldata_vx = matrix(1,ntr_glob,1,NT);
                    fulldata_vy = matrix(1,ntr_glob,1,NT);
                    fulldata_vz = matrix(1,ntr_glob,1,NT);
                    break;
            }
            fulldata_p = matrix(1,ntr_glob,1,NT);
            break;
            
    }
    if (ntr>0){
        switch (SEISMO){
            case 1 : /* particle velocities only */
                switch (WAVETYPE) {
                    case 1:
                        sectionvx=matrix(1,ntr,1,ns);
                        sectionvy=matrix(1,ntr,1,ns);
                        break;
                    case 2:
                        sectionvz=matrix(1,ntr,1,ns);
                        break;
                    case 3:
                        sectionvx=matrix(1,ntr,1,ns);
                        sectionvy=matrix(1,ntr,1,ns);
                        sectionvz=matrix(1,ntr,1,ns);
                        break;
                }
                break;
            case 2 : /* pressure only */
                sectionp=matrix(1,ntr,1,ns);
                sectionpnp1=matrix(1,ntr,1,ns);
                sectionpn=matrix(1,ntr,1,ns);
                break;
            case 3 : /* curl and div only */
                sectioncurl=matrix(1,ntr,1,ns);
                sectiondiv=matrix(1,ntr,1,ns);
                break;
            case 4 : /* everything */
                switch (WAVETYPE) {
                    case 1:
                        sectionvx=matrix(1,ntr,1,ns);
                        sectionvy=matrix(1,ntr,1,ns);
                        break;
                    case 2:
                        sectionvz=matrix(1,ntr,1,ns);
                        break;
                    case 3:
                        sectionvx=matrix(1,ntr,1,ns);
                        sectionvy=matrix(1,ntr,1,ns);
                        sectionvz=matrix(1,ntr,1,ns);
                        break;
                }
                sectioncurl=matrix(1,ntr,1,ns);
                sectiondiv=matrix(1,ntr,1,ns);
                sectionp=matrix(1,ntr,1,ns);
                break;
            case 5 : /* everything except curl and div*/
                switch (WAVETYPE) {
                    case 1:
                        sectionvx=matrix(1,ntr,1,ns);
                        sectionvy=matrix(1,ntr,1,ns);
                        break;
                    case 2:
                        sectionvz=matrix(1,ntr,1,ns);
                        break;
                    case 3:
                        sectionvx=matrix(1,ntr,1,ns);
                        sectionvy=matrix(1,ntr,1,ns);
                        sectionvz=matrix(1,ntr,1,ns);
                        break;
                }
                sectionp=matrix(1,ntr,1,ns);
                break;
        }
    }
    
    /* Memory for seismic data */
    sectionread=matrix(1,ntr_glob,1,ns);
    sectionpdata=matrix(1,ntr,1,ns);
    sectionpdiff=matrix(1,ntr,1,ns);
    sectionpdiffold=matrix(1,ntr,1,ns);
    switch (WAVETYPE) {
        case 1:
            sectionvxdata=matrix(1,ntr,1,ns);
            sectionvxdiff=matrix(1,ntr,1,ns);
            sectionvxdiffold=matrix(1,ntr,1,ns);
            sectionvydata=matrix(1,ntr,1,ns);
            sectionvydiff=matrix(1,ntr,1,ns);
            sectionvydiffold=matrix(1,ntr,1,ns);
            break;
            
        case 2:
            sectionvzdata=matrix(1,ntr,1,ns);
            sectionvzdiff=matrix(1,ntr,1,ns);
            sectionvzdiffold=matrix(1,ntr,1,ns);
            break;
            
        case 3:
            sectionvxdata=matrix(1,ntr,1,ns);
            sectionvxdiff=matrix(1,ntr,1,ns);
            sectionvxdiffold=matrix(1,ntr,1,ns);
            sectionvydata=matrix(1,ntr,1,ns);
            sectionvydiff=matrix(1,ntr,1,ns);
            sectionvydiffold=matrix(1,ntr,1,ns);
            sectionvzdata=matrix(1,ntr,1,ns);
            sectionvzdiff=matrix(1,ntr,1,ns);
            sectionvzdiffold=matrix(1,ntr,1,ns);
            break;
    }
    
    /* Memory for inversion for source time function */
    if((INV_STF==1)||(TIME_FILT==1) || (TIME_FILT==2)){
        sectionp_conv=matrix(1,ntr_glob,1,NT);
        sectionp_obs=matrix(1,ntr_glob,1,NT);
        source_time_function = vector(1,NT);
        switch (WAVETYPE) {
            case 1:
                sectionvy_conv=matrix(1,ntr_glob,1,NT);
                sectionvy_obs=matrix(1,ntr_glob,1,NT);
                sectionvx_conv=matrix(1,ntr_glob,1,NT);
                sectionvx_obs=matrix(1,ntr_glob,1,NT);
                break;
                
            case 2:
                sectionvz_conv=matrix(1,ntr_glob,1,NT);
                sectionvz_obs=matrix(1,ntr_glob,1,NT);
                break;
                
            case 3:
                sectionvy_conv=matrix(1,ntr_glob,1,NT);
                sectionvy_obs=matrix(1,ntr_glob,1,NT);
                sectionvx_conv=matrix(1,ntr_glob,1,NT);
                sectionvx_obs=matrix(1,ntr_glob,1,NT);
                sectionvz_conv=matrix(1,ntr_glob,1,NT);
                sectionvz_obs=matrix(1,ntr_glob,1,NT);
                break;
        }
    }
    
    /* memory for source position definition */
    srcpos1=fmatrix(1,8,1,1);
    
    /* memory of L2 norm */
    L2t = vector(1,4);
    epst1 = vector(1,3);
    epst2 = vector(1,3);
    epst3 = vector(1,3);
    picked_times = vector(1,ntr);
    
    fprintf(FP," ... memory allocation for PE %d was successfull.\n\n", MYID);
    
    
    /* Holberg coefficients for FD operators*/
    hc = holbergcoeff();
    
    MPI_Barrier(MPI_COMM_WORLD);
    
    /* Reading source positions from SOURCE_FILE */
    srcpos=sources(&nsrc);
    nsrc_glob=nsrc;
    
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    if(FORWARD_ONLY==0&&USE_WORKFLOW){
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        read_workflow(FILE_WORKFLOW,&workflow, &workflow_lines,workflow_header);
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    }
    
    /* create model grids */
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    if(L){
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        if(!ACOUSTIC){
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            if (READMOD){
                readmod(prho,ppi,pu,ptaus,ptaup,peta);
            }else{
                model(prho,ppi,pu,ptaus,ptaup,peta);
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            }
        }else{
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            if (READMOD){
                readmod_viscac(prho,ppi,ptaup,peta);
            }else{
                model_viscac(prho,ppi,ptaup,peta);
            }
        }
    }else{
        if(!ACOUSTIC){
            if (READMOD){
                readmod_elastic(prho,ppi,pu);
            }else{
                model_elastic(prho,ppi,pu);
            }
        }else{
            if (READMOD){
                readmod_acoustic(prho,ppi);
            }else{
                model_acoustic(prho,ppi);
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            }
        }
    }
    
    /* check if the FD run will be stable and free of numerical dispersion */
    checkfd(FP, prho, ppi, pu, ptaus, ptaup, peta, hc, srcpos, nsrc, recpos, ntr_glob);
    
    /* calculate damping coefficients for CPMLs*/
    if(FW>0)
        PML_pro(d_x, K_x, alpha_prime_x, a_x, b_x, d_x_half, K_x_half, alpha_prime_x_half, a_x_half, b_x_half, d_y, K_y, alpha_prime_y, a_y, b_y, d_y_half, K_y_half, alpha_prime_y_half, a_y_half, b_y_half);
    
    MPI_Barrier(MPI_COMM_WORLD);
    
    SHOTINC=1;
    RECINC=1;
    
    switch(TIME_FILT){
        case 1: FC=FC_START; break;
            /*read frequencies from file*/
        case 2: FC_EXT=filter_frequencies(&nfrq); FC=FC_EXT[FREQ_NR]; break;
    }
    
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    /* Save old SOURCE_SHAPE, which is needed for STF */
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    SOURCE_SHAPE_OLD = SOURCE_SHAPE;
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    if(WAVETYPE==2 || WAVETYPE==3) SOURCE_SHAPE_OLD_SH=SOURCE_SHAPE_SH;
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    nt_out=10000;
    if(!VERBOSE) nt_out=1e5;
    /*------------------------------------------------------------------------------*/
    /*----------- start fullwaveform iteration loop --------------------------------*/
    /*------------------------------------------------------------------------------*/
    
    for(iter=1;iter<=ITERMAX;iter++){  /* fullwaveform iteration loop */
        
        // At each iteration the workflow is applied
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        if(USE_WORKFLOW&&(FORWARD_ONLY==0)){
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            apply_workflow(workflow,workflow_lines,workflow_header,&iter,&FC,wavetype_start,&change_wavetype_iter,&LBFGS_iter_start);
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        }
        
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        if(GRAD_METHOD==2&&(FORWARD_ONLY==0)){
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            /* detect a change in inversion process and restart L-BFGS */
            if(iter==INV_RHO_ITER||iter==INV_VP_ITER||iter==INV_VS_ITER){
                LBFGS_iter_start=iter;
                
                if(WOLFE_CONDITION) {
                    /* Restart Step Length search */
                    alpha_SL_old=1;
                }
                
                /* set values */
                FWI_run=1;
                gradient_optimization=1;
            }
            
            /* restart L-BFGS */
            if(iter==LBFGS_iter_start) {
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                lbfgs_reset(iter,N_LBFGS,LBFGS_NPAR,s_LBFGS,y_LBFGS,rho_LBFGS);
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                /* set values */
                FWI_run=1;
                gradient_optimization=1;
            }
            
        }
        
        if (MYID==0){
            time2=MPI_Wtime();
            fprintf(FP,"\n\n\n ------------------------------------------------------------------\n");
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                fprintf(FP,"\n\n\n                   TDFWI ITERATION %d \t of %d \n",iter,ITERMAX);
            } else {
                fprintf(FP,"\n\n\n                        FD-SIMULATION \n");
            }
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            fprintf(FP,"\n\n\n ------------------------------------------------------------------\n");
        }
        
        countstep=0;
        
        if(GRAD_METHOD==1) {FWI_run=1; steplength_search=0; gradient_optimization=1;}
        
        /*-----------------------------------------------------*/
        /*  While loop for Wolfe step length search            */
        /*-----------------------------------------------------*/
        while(FWI_run || steplength_search || gradient_optimization) {
            
            /*-----------------------------------------------------*/
            /*              Calculate Misfit and gradient          */
            /*-----------------------------------------------------*/
            if(FWI_run){
                /* For the calculation of the material parameters between gridpoints
                 they have to be averaged. For this, values lying at 0 and NX+1,
                 for example, are required on the local grid. These are now copied from the
                 neighbouring grids */
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                if (L){
                    if(!ACOUSTIC){
                        matcopy(prho,ppi,pu,ptaus,ptaup);
                    } else {
                        matcopy_viscac(prho,ppi,ptaup);
                    }
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                }else{
                    if(!ACOUSTIC){
                        matcopy_elastic(prho, ppi, pu);
                    }else{
                        matcopy_acoustic(prho, ppi);
                    }
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