The phrase "ocean bottom" refers to the very bottom part of the ocean, which is also known as the seabed. It is the solid ground beneath the water where things like sand, rocks, and other materials are found. Full definition
Other papers in the issue examine how deep sea sediments may affect seismic wave readings, and evaluate how the Cascadia Initiative's data collection from ocean bottom seismometers has improved over the first three years of the study. (sciencedaily.com)
Next year, Eilon will be part of an international effort to instrument large unexplored swaths of the Pacific with ocean bottom seismometers. (sciencedaily.com)
Peralta - Ferriz, C., J. H. Morison, J. M. Wallace and J. Zhang, (2011), A basin - coherent mode of sub-monthly variability in Arctic Ocean bottom pressure, Geophys. (psc.apl.uw.edu)