Marine geophysics Contents: 1) Preview2) Locating offshore observations 3) Seabed imaging by sonar and lidar 4) Seismic exploration at sea: a theoretical background 5) Seismic data acquisition at sea 6) The marine gravity field 7) The Earth s magnetic field at sea 8) Heat flow 9) Investigations of the sea floor using electrical methods 10) Seabed exploration using radiometric methods 11) Geophysical observations in offshore boreholes 12) Deep sea geophysics and the changing geometry of the oceans 13) Studies of the oceanic lithosphere: the sedimentary cover 14) Studies of the oceanic lithosphere: the crustal basement and upper mantle 15) Investigations of divergent and transform continental margins 16) Studies of subduction zones (AUT)