摘要: Deep-sea tsunami measurements play a major role in understanding the physics of wave generation and propagation, creation an effective warning system. The paper provides overview history recording open ocean from beginning (about 50 years ago) to present day. It describes modern monitoring systems, including Deep-ocean Assessment Reporting Tsunamis (DART), innovative Japanese bottom cable projects, NEPTUNE-Canada geophysical observatory. specific peculiarities seafloor longwave observations deep are discussed compared with those recorded coastal regions. Tsunami detection presure is exemplified based on analysis distant (22000 km) records 2004 Sumatra northeastern Pacific.