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International Strategy for Disaster Reduction
Platform for the Promotion of Early Warning


What is tsunami?
In brief - Recent and historical tsunamis - Tsunami early warning system technique - Tsunami warning systems
- Key tsunami actors & organisations - Research projects - Further reading

Tsunami early warning system technique
Deep-ocean Assessment and Reporting of Tsunamis (DART):
Brief Overview and Status Report by F. I. González, H.B. Milburn, E.N. Bernard, J. Newman
As part of the U.S. National Tsunami Hazard Mitigation Program, the DART Project is an effort by the Pacific Marine Environmental Laboratory of the National Oceanic and Atmospheric Administration to develop a capability for real-time reporting of tsunami measurements in the deep ocean. The systems utilize bottom pressure recorders (BPRs) capable of detecting and measuring tsunamis with amplitudes as small as 1 cm in 6000 m of water. The data is transmitted by acoustic modem to a surface buoy, which then relays the information to a ground station via satellite telecommunications. This concept has proved itself through several deep ocean deployments of prototype systems that provided extended periods of excellent data return. Design improvements in the next generation of systems will reduce the high data losses experienced during other periods. A planned network of six buoys in the north Pacific and equatorial region focuses on the hazard to U.S. coastal communities. Once this technology matures, consideration should be given to a coordinated international effort to establish additional stations of direct benefit to other Pacific Rim countries. See full article.

Animation of how the DART-system is working

Source: NOAA/PMEL, Sketch of the DART System
Dart Buoys provide real-time reporting of tsunamis
  Summarised by L. Kong (ITIC) from the International Tsunami Symposium 2001 proceedings:
Global Sea Level Observing System (GLOSS)
GLOSS is an international programme conducted under the auspices of the Joint Technical Commission for Oceanography and Marine Meteorology of the World Meteorological Organisation and the Intergovernmental Oceanographic Commission. The programme aims to establish a high quality global and regional sea level network for application to climate, oceanographic and coastal sea level research. The main component of GLOSS is the 'Global Core Network' of 290 sea level stations around the world for long-term climate change and oceanographic sea level monitoring.
Global Seismographic Network (GSN)
GSN is one of the four major components of the Incorporated Research Institutions for Seismology (IRIS) Consortium, which is dedicated to exploring the Earth's interior through the collection and distribution of seismographic data. The goal of the GSN is to deploy over 128 permanent seismic recording stations uniformly over the earth's surface. It provides funding to two network operators: IRIS/ASL and IRIS/IDA, Network Operations Center.

Center for Tsunami Inundation Mapping Efforts (TIME)


TIME was created to assist the Pacific States in the development and maintenance of maps which identify areas of potential tsunami flooding. It is part of NOAA’s National Tsunami Hazard Mitigation Programme.

GFZ project or other technical descriptions

Concept of the Federal Republic of Germany for the Establishment of a Tsunami Early-Warning System in the Disaster Region of the Indian Ocean