hh_elastic.c 3.88 KB
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\begin{verbatim}
/*------------------------------------------------------------------------
 *   Generates elastic model properties (vp,vs,density) on the fly
 *   if L>0 damping model (qp and qs) are generated, too
 *
 *   depending on model dimension in vertical direction and local variable "h"
 *   this function can generate a
 *   	-> homogeneneous full space
 *   	-> layer over half space
 *
 *  ----------------------------------------------------------------------*/

#include "fd.h"

void model_elastic(float  ***  rho, float ***  pi, float ***  u,
		float ***  taus, float ***  taup, float *  eta){

	/*--------------------------------------------------------------------------*/
	/* extern variables */
	extern float DY;
	extern int NX, NY, NZ, NXG, NYG, NZG, POS[4], L, MYID;
	extern char  MFILE[STRING_SIZE];

	/* local variables */
	float muv, piv;
	float Vp, Vs, Rho;
	float *pts=NULL;
	float *** pwavemod, *** swavemod;
	float y;
	int i, j, k, ii, jj, kk;
	int writeallmodels=0;
	char filename[STRING_SIZE];

	/*-----------------material property definition -------------------------*/

	/* parameters for layer 1 */
	const float vp1=3500.0, vs1=2000.0, rho1=2000.0, h=1000000;

	/* parameters for layer 2 */
	const float vp2=5700.0, vs2=3400.0, rho2=2500.0;


	/*internal switch for writing all models to file (writeallmodels=1)
	 * or just density (writeallmodels=0)
	 * BE AWARE that the output of additional models besides density
	 * cause extra but temporal memory allocation of the size of the
	 * local subgrid times the number of models!!!!!!!!!! */
	writeallmodels=0;

	if (writeallmodels) {
		pwavemod  =  f3tensor(0,NY+1,0,NX+1,0,NZ+1);
		swavemod  =  f3tensor(0,NY+1,0,NX+1,0,NZ+1);
	}

	/*elastic simulation */
	if (L==0) {
		/* loop over global grid */
		for (k=1;k<=NZG;k++){
			for (i=1;i<=NXG;i++){
				for (j=1;j<=NYG;j++){

					/*=========================================================
					 * modify below this point for ELASTIC model definition
					 *=========================================================
					*/
					/*note that "y" is used for the vertical coordinate*/
					/* calculate vertical coordinate in m */

					y=(float)j*DY;

					/* two layer case */
					if (y<=h){
						Vp=vp1; Vs=vs1; Rho=rho1; }


					else{
						Vp=vp2; Vs=vs2; Rho=rho2;}

					/*=========================================================
					 * modify up to this point for ELASTIC model definition
					 *=========================================================
					 */

					muv=Vs*Vs*Rho;
					piv=Vp*Vp*Rho;

					/* only the PE which belongs to the current global gridpoint
							is saving model parameters in his local arrays */
					if ((POS[1]==((i-1)/NX)) &&
							(POS[2]==((j-1)/NY)) &&
							(POS[3]==((k-1)/NZ))){
						ii=i-POS[1]*NX;
						jj=j-POS[2]*NY;
						kk=k-POS[3]*NZ;

						u[jj][ii][kk]=muv;
						rho[jj][ii][kk]=Rho;
						pi[jj][ii][kk]=piv;

						if (writeallmodels) {
							pwavemod[jj][ii][kk]=Vp;
							swavemod[jj][ii][kk]=Vs;
						}
					}
				}
			}
		}
	}


	/* each PE writes his model to disk */

	if (writeallmodels) {
		sprintf(filename,"%s.SOFI3D.pi",MFILE);
		writemod(filename,pi,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);

		sprintf(filename,"%s.SOFI3D.u",MFILE);
		writemod(filename,u,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);

		sprintf(filename,"%s.SOFI3D.vp",MFILE);
		writemod(filename,pwavemod,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);

		sprintf(filename,"%s.SOFI3D.vs",MFILE);
		writemod(filename,swavemod,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);
	}

	sprintf(filename,"%s.SOFI3D.rho",MFILE);
	writemod(filename,rho,3);
	MPI_Barrier(MPI_COMM_WORLD);
	if (MYID==0) mergemod(filename,3);

	free_vector(pts,1,L);
	if (writeallmodels) {
		free_f3tensor(pwavemod,0,NY+1,0,NX+1,0,NZ+1);
		free_f3tensor(swavemod,0,NY+1,0,NX+1,0,NZ+1);
	}

}
\end{verbatim}