No Thickness   Depth    Vp       Vs
       (m)       (m)    (m/s)    (m/s)
 1,    1.00,    1.00,  300.00,  120.00
 2,   39.00,   40.00, 1840.00,  480.00
 3,   44.00,   84.00, 1840.00,  690.00
 4,   -----,   -----, 1840.00,  830.00