'Demo model for 2-D elastic finite differences' / 0 110 0 40 0 1 (boundaries of the model) 6 SURFACES 6 SIMPLE BLOCKS: -1 2 3 / -1 -2 3 4 / -3 4 5 6 / -1 -4 5 / -5 6 / -6 / 3 COMPLEX BLOCKS: 1 / 2 3 / 4 5 6 / 'EARTH SURFACE' 1 -3 0 0 0 / (i.e. W-X3=0, tension=0) 0 (W) 'SURFACE' 2 1 -3 0 0 / (i.e. W(X1)-X3=0, tension=0) 2 (numbers of grid points) 20 60 (X1 grid coordinates) 0 5 (X3 grid coordinates) 'SURFACE' 3 -3 0 0 0 / (i.e. W-X3=0, tension=0) 5 (W) 'SURFACE' 4 1 -3 0 0 / (i.e. W(X1)-X3=0, tension=0) 2 (numbers of grid points) 10 30 (X1 grid coordinates) 0 15 (X3 grid coordinates) 'SURFACE' 5 1 -3 0 0 / (i.e. W(X1)-X3=0, tension=0) 2 (numbers of grid points) 30 50 (X1 grid coordinates) 15 20 (X3 grid coordinates) 'SURFACE' 6 -3 0 0 0 / (i.e. W-X3=0, tension=0) 20 (W) 'END OF SURFACES' / 'COMPLEX BLOCK' 1 'VP ' 1 (P wave velocity) 0 0 0 0 / (i.e. VP=constant, tension=0) 200 (the value of velocity) 'VS ' 1 (S wave velocity) 0 0 0 0 / (i.e. VS=constant, tension=0) 100 (the value of velocity) 'DEN' 1 (density) 0 0 0 0 / (i.e. density=constant, tension=0) 1600 (the value of density) 'COMPLEX BLOCK' 2 'VP ' 1 (P wave velocity) 0 0 0 0 / (i.e. VP=constant, tension=0) 300 (the value of velocity) 'VS ' 1 (S wave velocity) 0 0 0 0 / (i.e. VS=constant, tension=0) 150 (the value of velocity) 'DEN' 1 (density) 0 0 0 0 / (i.e. density=constant, tension=0) 1700 (the value of density) 'COMPLEX BLOCK' 3 'VP ' 1 (P wave velocity) 0 0 0 0 / (i.e. VP=constant, tension=0) 700 (the value of velocity) 'VS ' 1 (S wave velocity) 0 0 0 0 / (i.e. VS=constant, tension=0) 350 (the value of velocity) 'DEN' 1 (density) 0 0 0 0 / (i.e. density=constant, tension=0) 1800 (the value of density) 'END OF COMPLEX BLOCKS, END OF THE INPUT DATA FOR THE MODEL' /