Good Vibrations: a closer look at the Ocean Bottom Seismometer (OBS)
An OBS is a high-tech instrument that is used to measure what is going on under our feet from metres to kilometres beneath the seafloor. The instrument consists of several parts: Seismometer Hydrophone Data Logger Releaser Flag The seismometer, or geophone, measures tiny ground vibrations. These can be due to earthquakes, underwater volcanoes, waves in the ocean, storms (and even marine vessels!). These events may cause very, very small ground vibrations that we may not sense