Which of these statements about 'seismic' as a method is false?

1. Seismic is mainly performed at sea - as a ship moves freely in all directions the seismic measurements are easier to obtain at sea than on land.
2. Seismic imaging is analyzed visually by experts trained to find out if certain layers are likely to contain hydrocarbons.
3. Seismic is produced with the aid of a series of very sensitive microphones called geophones which listens to and records the wave echo from the surface.
4. Seismic is used by geophysicist to spot hydrocarbon accumulations.
5. Seismic consists of making a veritable echography of the substratum a shock on the surface of the ground producing sound waves which are refracted and reflected below the ground surface.