Reflection seismology (or seismic reflection)
is a method of exploration geophysics that uses
the principles of seismology to estimate the
properties of the Earth’s subsurface from
reflected seismic waves.
Seismic surveys involve an acoustic source that release bubbles of compressed air, these bubbles collapse and send a directionally focused low frequency sound wave towards the sea floor.
The streamers towed behind the seismic vessel can be up to 10km long, and contain pressure sensitive devices called hydrophones. The hydrophones convert the reflected pressure signals and transmit back to the recording system on board the seismic vessel. Each streamer is solid and filled with neutrally buoyant foam.