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Tsunamis in Lake Taupo, New Zealand, on the 30th November 2022: observations, interpretation and implications

Authors

Power,  William
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Roger,  Jean
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gusman,  Aditya
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wang,  Xiaoming
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Burbidge,  David
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shanks,  Jackson
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rosenberg,  Michael
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Asher,  Cameron
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Britten,  Karen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Johnson,  Richard
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Moore,  Matthew
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Moran,  Cameron
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Brakenrig,  Thomas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lauren,  Coup
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

MacDonald,  Nick
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Power, W., Roger, J., Gusman, A., Wang, X., Burbidge, D., Shanks, J., Rosenberg, M., Asher, C., Britten, K., Johnson, R., Moore, M., Moran, C., Brakenrig, T., Lauren, C., MacDonald, N. (2023): Tsunamis in Lake Taupo, New Zealand, on the 30th November 2022: observations, interpretation and implications, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3839


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020706
Abstract
A magnitude 5.6 earthquake occurred under Lake Taupo in New Zealand at 11:47pm (local time) on the 30th November 2022. Subsequent to this earthquake evidence of tsunami waves was discovered around the lake shore, and also recorded on three water-level gauges. Surveys were made to record inundation heights and extents around the lake. Interpretation of the collected data suggests that there were at least two tsunami sources: 1) a largely sub-lacustrine landslide occurring in Wharewaka Bay near Taupo township, and 2) a tsunami generated by movement of the lake bed associated with the earthquake. The observed impacts of the landslide-caused tsunami appear to mainly affect an area of the lake within a few hundred metres of the landslide source, while those generated by the co-seismic lake-bed movement are more widely distributed around the lake, particularly on the eastern side. Tsunami observations have been interpreted alongside seismic and geodetic data to better understand the source processes that generated the tsunami waves. Modelling and further work to quantify both tsunami sources are ongoing and latest results will be presented. We will describe the installation of new water-level instruments to better monitor lake water disturbances, e.g., caused by volcanic activities, and discuss the implications of this event for our understanding of the hazard and risk in the Taupo region.