No Thickness   Depth    Vp       Vs
       (m)       (m)    (m/s)    (m/s)
 1,    1.00,    1.00,  300.00,  140.00
 2,    8.00,    9.00,  640.00,  340.00
 3,    6.00,   15.00, 2800.00,  480.00
 4,   11.00,   26.00, 2800.00,  650.00
 5,   26.00,   52.00, 2800.00,  730.00
 6,   -----,   -----, 3100.00,  970.00