Table T3. Relative amplitude changes of subseafloor reflections with varying 4-kHz source elevations (traces normalized on seafloor arrival).
 
Source elevation (ms)
Seafloor
11
14
27
32
36
39
Background
Near 20 10 9 4.5 6 8.5 7 3
Near 20 11 6.5 3 4 10.5 5 2
Near 20 8 6 3.5 4 7 5 2
Near 20 11 11 6 6 10 7 2.5
40 m 20 11 7 5.5 5 12 10 3
750 m 20 6 7 4.5 7.5 13 4 3
750 m 20 10 10 7 8 13 9 4
750 m 20 12 6 4 6.5 13 7.5 4
1500 m 20 6 6 4 4.5 5.5 4.5 3.5
3000 m 20 9 7.5 7 10.5 8 6 4
Average reflection amplitude: Near 10.2 7.9 4.5 5 9.6 6.8 2.5
  750 m 9.3 7.7 5.2 7.3 13 6.8 3.7