For the purpose of studying the impact of the 5 March 2021 Kermadec tsunami in Tutukaka Harbor, Whangarei, New Zealand, and its neighbourhood, a high-resolution digital elevation model (DEM) of Tutukaka Harbor has been built using two different types of data (Roger, 2022). These are: - Digitized and georeferenced British Admiralty Nautical Chart (Cape Brett to Paepae-o-Tu / Bream Tail, 1:90,000 – Id: NZ300521 and Tutukaka Harbour, 1:12,000 - Id: NZ552121) - The New Zealand 8 m DEM (LINZ, 2012) for the land part The compilation of data has been interpolated to a regular spatial resolution of 0.00009° (~10m) between 174.5233364°W and 174.5797705°W and -35.6252705°S and -35.5979928°S using the krigging method. For more information about this method, see for example Oliver and Webster (1990). DOI: https://doi.org/10.21420/AQBF-Q453 Cite when using the DEMs: Roger, J. (2022). Digital Elevation Model of Tutukaka Harbor and neighbourhood, Whangarei District, New Zealand [Data set]. GNS Science. https://doi.org/10.21420/AQBF-Q453

This dataset consist of a series of Tsunami Travel Time maps showing the expected travel time of the first arrival of a tsunami from a particular location to the closest point on the coast, a coastal tide gauge station or a DART location. The maps were created with ttt (https://www.ngdc.noaa.gov/hazard/tsu_travel_time.shtml). The travel times are contoured every half hour. Note that the amplitude of the wave is not calculated, nor does it show the arrival time of the first maximum or the overall maximum of the tsunami. They would be expected to arrive later than the times shown. Note also that the accuracy of the model is limited by the accuracy and resolution of the underlying bathymetry data which is relatively coarse near the coast. DOI: https://doi.org/10.21420/KB1D-A106 Cite as: GNS Science. (2020). New Zealand Tsunami Travel Time Maps [Data set]. GNS Science. https://doi.org/10.21420/KB1D-A106

This dataset defines the maximum tsunami height (maximum amplitude) expected to be exceeded once every 100, 500, 1000 and 2500 years on average at the 50th and 84th percentile of confidence, as estimated by the model described in Power et al. (2022). The dataset also defines the coastal sections that were used for this modelling. The expected maximum tsunami heights are presented for each of these coastal sections. Please note that the expected maximum tsunami height will typically only occur at one location within each coastal section. It is a conservative (pessimistic) assumption if this height is used throughout the section. DOI: https://doi.org/10.21420/C3CK-FB93 Cite data as: GNS Science. (2022). National Tsunami Hazard Model (NTHM) 2021 [Data set]. GNS Science. https://doi.org/10.21420/C3CK-FB93 Cite report as: Power, W.L.; Burbidge, D.R.; Gusman, A.R. 2022 The 2021 update to New Zealand's National Tsunami Hazard Model. Lower Hutt, N.Z.: GNS Science. GNS Science report 2022/06. 63 p.; doi: 10.21420/X2XQ-HT52

A catalogue of scenarios for tsunami-generating earthquakes has been constructed. The scenarios are grouped by the regions of potential tsunami origins around the Pacific Rim as defined by MCDEM (2008). The regions are divided into subregions representing unique source areas. Within each subregion propagation models have been computed for scenarios associated with earthquakes at intervals of 0.2 in MW. Forecasts of the maximum wave-heights around the New Zealand coasts associated with each scenario are expressed in terms of the maximum water–level (m) attained within each MCDEM coastal zone for tsunami warnings. This maximum water-level information has been put into the form of a threat–level for each coastal zone. By using the maximum water-level anywhere within the coastal zone as an estimate of the threat-level a degree of conservatism is incorporated. The tsunami threat level models included here are the best forecast models that the Duty Team and GeoHazard Analysts currently has to advise MCDEM in the immediate aftermath of an earthquake. Although these models were created with best endeavours, they do have limitations. When time allows they should be subject to interpretation and revision by the TEP. Under no circumstances should these models be released outside of GNS Science. DOI: https://doi.org/10.21420/9JJV-WY50 Cite as: GNS Science. (2020). Tsunami Scenario Database [Data set]. GNS Science. https://doi.org/10.21420/9JJV-WY50

This dataset defines the maximum expected tsunami height (maximum amplitude) for return periods of 100, 500 and 2500 years at the 50th and 84th percentile of confidence, as estimated by the model described in Power (2013). The dataset also defines the coastal sections that were used for this modelling. The maximum expected tsunami heights are presented for each of these coastal sections. Please note that the maximum expected tsunami height will typically only occur at one location within each coastal section. It is a conservative (pessimistic) assumption if this height is used throughout the section. DOI: https://doi.org/10.21420/2Y8C-2D58 Cite data as: GNS Science. (2013). National Tsunami Hazard Model - 2013. GNS Science. https://doi.org/10.21420/2Y8C-2D58 Cite report as: Power, W.L. (compiler). 2013. Review of Tsunami Hazard in New Zealand (2013 Update), GNS Science Consultancy Report 2013/131. 222 p. A database for the 2021 version of the NTHM is under development.