Tsunami modelling for Porirua City: the methodology to inform land use planning response

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Gusman AR, Power WL, Mueller C. 2019. Tsunami modelling for Porirua City: the methodology to inform land use planning response. Lower Hutt (NZ): GNS Science. 51 p. (GNS Science report 2019/80). doi:10.21420/SEG2-Q850.

Tsunami pose a risk to communities on the New Zealand coast and land-use planning is one of the key methods for mitigating that risk. This report includes a probabilistic assessment of the tsunami inundation hazard to the city of Porirua. The method used is to identify earthquake caused tsunami scenarios contributing to the tsunami hazard at the coast at chosen return periods (100, 500, 1000, 2500 years) and model these scenarios through to inundation. The resulting maps of inundation are then combined to produce the probabilistic hazard maps. The analysis was repeated for various assumed levels of sea-level rise (0.65m, 1.0m, 1.99m), which showed that the likelihood of tsunami inundation of low-lying parts of Porirua increases rapidly with the assumed level of sea rise. In addition to covering the central areas of Porirua, the hazard analysis was extended to cover Pukerua Bay. (auth)