SPC Geoscience Division

Monday 17 June 2013, Secretariat of the Pacific Community (SPC) –  The Secretariat of the Pacific Community (SPC), with Geoscience Australia, has developed a computer model to help the Government of Tonga see what the impact of a tsunami would be on Tongatapu. Part of an AusAID funded project, the model makes use of high resolution data, the collection of which was made possible by Australia, the European Union, and the New Zealand Ocean Sciences Grant.

The new Tsunami Inundation Model shows that an 8.7 magnitude earthquake in the Tonga Trench would create a wave that would hit the eastern coast of Tongatapu within ten to twenty minutes, inundating most of Nuku’alofa.  Leveni ‘Aho, Director of Tonga’s National Disaster Management Office, says the new computer model has enabled the Government of Tonga to consider how the public would need to respond in a range of possible scenarios.

‘Nuku’alofa has, perhaps, the biggest urban population in the Pacific living in a very low-lying area. We can talk about Japan’s earthquakes but if we can present something that shows what is going to happen to us here at home, the message is much more effective.  For us, it’s an excellent opportunity to help communities to be aware of what could possibly come and what they will need to do if a significant event occurs,’ he says.

After the model was presented to the cabinet and the National Emergency Management Committee, the Hon. Prime Minister Lord Tuʻivakanō indicated that the government would need support to construct access ways to some parts of Nuku’alofa so that the local community can quickly get to safe areas.

Mr ‘Aho says the model is also helping the Government of Tonga to design emergency response measures and improve long-term urban planning for Nuku’alofa and its surrounding villages.‘The tsunami computer model given by SPC has provided the government with a wonderful tool to help us really understand the risks of different scenarios and to prepare in the best ways we can,’ he says.

Mosese Sikivou, Deputy Director of SPC’s Disaster Reduction Programme, says this project is part of SPC’s assistance to Tonga in connection with its Joint National Action Plan for Climate Change Adaptation and Disaster Risk Management, approved by Cabinet in July 2010. The work to develop the model is part of an integrated approach that SPC and other partners are taking right across the Pacific to try and maximise scarce resources and minimise duplication of effort and potential conflict in policy development.