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Ocean-bottom four-component 3D seismic acquisition allows both P-wave and S-wave energy to be recorded on the seabed. This is achieved using three orthogonal geophones and a vertical hydrophone. Recording both wave modes provides more information related to rock properties.
P waves are influenced by all three bulk rock properties (compressibility, rigidity and density) while S waves are influenced by rigidity and density only. Combining these observations allows more accurate estimation of key reservoir characteristics.

3D-4C has many vital uses including lithology identification, fluid discrimination, imaging through gas, fracture and stress-field characterization and density estimation.
3D-4C provides important complementary seismic information for comparison with
conventional P-wave images and AVO results.