Recent developments of ocean bottom seismic and electromagnetic instruments operated by ROV

Essential information to understand geodynamic processes is provided from imaging the Earth´s interior by using geophysical observations. Recently, we have developed two geophysical instruments to exploit oceanic mantle, the BBOBS-NX (broad-band ocean bottom seismometer of next generation) and the EFOS (Earth´s electric field observation system), both of them are operated by ROV (remotely operated underwater vehicle). They provide data of much higher quality than conventional instruments such as BBOBS (broad-band ocean bottom seismometer) and OBEM (ocean bottom electro-magnetometer).