Roger, J.H. 2022 5 March 2021 tsunami in Whangarei: post-tsunami field survey and numerical modelling. Lower Hutt, N.Z.: GNS Science. GNS Science report 2022/03. 20 p.; doi: 10.21420/WAE7-XQ56
Abstract
The 5 March 2021 tsunami triggered by the Mw 8.1 Raoul Island earthquake propagated on a Pacific-wide scale. Being one of the countries closest to the epicentre, New Zealand issued a tsunami warning which was quickly confirmed by the New Zealand DART network and the coastal tsunami gauges. Preliminary modelling of wave propagation showed that some places in the Northland New Zealand, especially along the east coast of the Whangārei District, could have seen wave amplitudes of 1 m and more. A two-day field survey has been conducted by GNS Science in the aftermath of the event to find evidences of the tsunami. The results of the survey are presented in this report. Further high-resolution modelling results are compared to the observations and testimonies and confirm the low impact of the tsunami. (auth)
