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NEAMTWS - Structural elements of the TWS


Candidate Tsunami Watch Providers (CTSPs), Tsunami National Contacts (TNCs), Tsunami Warning Focal Points (TWFPs) and National Tsunami Warning Centres (NTWCs) are basic structural elements of the TWS in the NEAM region. The functions of such components of the NEAMTWS have been adopted by the ICG at the second session of the NEAMTWS held in Nice, 22-24 May 2006.

Candidate Tsunami Service Providers (CTSPs)

• Collection, record, processing and analysis of earthquake data for the rapid initial assessment (locate the earthquake, the depth, the magnitude, the origin time) as a basis for the alert system

• Computing the arrival time of the tsunami in the forecasting points listed in the Communication Plan

• Collection, record, processing and analysis of sea level data for confirming and monitoring the tsunami or for cancelling elements of the alert system

• A decision making process in accordance with the Communication Plan to
elaborate messages

• Dissemination to the Member States focal points (and national warning centres) of the messages in accordance with the Communication Plan, included the tsunami travel time, the amplitude and period of tsunami measured, and cancellation messages 

Tsunami National Contact (TNC)
The person designated by an ICG Member State government to represent his/her country in the coordination of international tsunami warning and mitigation activities. The person is part of the main stakeholders of the national tsunami warning and mitigation system program. The person may be the Tsunami Warning Focal Point, from the national disaster management organization, from a technical or scientific institution, or from another agency with tsunami warning and mitigation responsibilities.

Tsunami Warning Focal Point (TWFP)
The Tsunami Warning Focal Point (TWFP) is a 7x24 contact person, or other official point of contact or address designated by a government, available at the national level for rapidly receiving and issuing tsunami event information (such as warnings). The Tsunami Warning Focal Point either is the emergency authority (civil defense or other designated agency responsible for public safety), or has the responsibility of notifying the emergency authority of the event characteristics (earthquake and/or tsunami), in accordance with national standard operating procedures. The Tsunami Warning Focal Point receives international tsunami warnings from the NEAMTWS or other regional warning centers.

• Reception of the messages transmitted by the Regional Tsunami Watch Centres

• Evaluate and issue national warnings in accordance with the National Emergency Plan

• Transmission of warning messages to the National Emergency Authorities

• Operating 24/7


The fifth session of the ICG/NEAMTWS has adopted roles, requirements and performance indicators for NTWCs and CTWPs.  


To date, five countries have offered to host CTWPs: France, Greece, Italy, Portugal and Turkey; Germany has offered to provide backup for data collection and processing. 




Established TNCs and TWFPs and prospective CTWPs in the NEAM region (map based on the General Bathymetric Chart of the Oceans - GEBCO)


Additionally to the TWFP functions,

National Tsunami Warning Centres (NTWCs)

• Collect, record, and process earthquake data for the rapid initial warning (locate the earthquake, the depth, the magnitude, the origin time)

• Compute the arrival time of the tsunami in the national forecasting points

• Collect, record, and process sea level data for confirming or cancelling the warning Warning Centres strive to be:

• Rapid, by providing warnings as soon as possible after a potential tsunami generation

• Accurate, by issuing warnings for all destructive tsunamis while minimizing false warnings

• Reliable, by making sure they operate continuously, and that their messages are sent and received promptly and understood by the users of the system.




Hosted by:
UNESCO/IOC Project Office for IODE Oostende, Belgium
1 rue Miollis, 75732 Paris Cedex 15, France | Tel: +33 1 45 68 39 84 | Fax: +33 1 45 68 58 12