Recent tsunami research has presented New Zealand with a mixed bag of news. Parts of our coast are exposed to greater tsunami hazard than previously thought, while the hazard in other coastal regions is the same or less. The findings come from a new GNS Science report commissioned by the Ministry for Civil Defence and Emergency Management. It updates a report on New Zealand’s tsunami hazards that we compiled in 2005.
This year’s report incorporates new research and significant changes in scientific understanding since our 2005 report. It focuses on the entire New Zealand coastline rather than just the main population centres. It also uses more advanced modelling to quantify the tsunami hazard. Areas where the hazard is higher are the North Island’s east-facing coasts and the southwest of the South Island. In other coastal regions, the tsunami hazard remains about the same, or has even decreased.
Our recent research and modelling has shown the hazard from near-source tsunami with little travel time is higher than previously estimated. This is particularly the case for tsunami generated by undersea earthquakes off the North Island’s east coast.
Via Mathijs Booden