How do seismic reflection techniques reveal structures below the seafloor?

Seismic reflection techniques reveal structures below the seafloor by utilizing the principles of echo sounding to map subsurface interfaces. The process involves several key steps:1

• Wave Generation: A seismic source, such as an air gun, is used to initiate seismic waves that travel through the water and into the sub-seafloor strata.23
• Reflection: As these waves encounter interfaces where rock properties—such as density—change, a portion of the energy is reflected back toward the surface.14
• Detection: Towed hydrophone arrays (streamers) detect these returning sound waves. The system records both the travel time and the amplitude of the signals.3
• Interpretation: By analyzing the round-trip travel time and velocity information, geophysicists can determine the distance to these interfaces and map the geologic structure.1

These data are processed to create cross-sectional images or three-dimensional cubes of the subsurface, allowing researchers to identify features like sedimentary basins, faults, and potential petroleum reservoirs.53