Articles | Volume 22, issue 3
Nat. Hazards Earth Syst. Sci., 22, 1073–1082, 2022
https://doi.org/10.5194/nhess-22-1073-2022

Special issue: Tsunamis: from source processes to coastal hazard and...

Nat. Hazards Earth Syst. Sci., 22, 1073–1082, 2022
https://doi.org/10.5194/nhess-22-1073-2022
Research article
01 Apr 2022
Research article | 01 Apr 2022

Characteristics of two tsunamis generated by successive Mw 7.4 and Mw 8.1 earthquakes in the Kermadec Islands on 4 March 2021

Yuchen Wang et al.

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Cited articles

Aránguiz, R., Catalán, P. A., Cecioni, C., Bellotti, G., Henriquez, P., and González, J.: Tsunami resonance and spatial pattern of natural oscillation modes with multiple resonators, J. Geophys. Res.-Oceans, 124, 7797–7816, https://doi.org/10.1029/2019JC015206, 2019. 
Baba, T., Takahashi, N. Kaneda, Y. Ando, K. Matsuoka, D., and Kato, T.: Parallel implementation of dispersive tsunami wave modeling with a nesting algorithm for the 2011 Tohoku Tsunami, Pure Appl. Geophys., 172, 3433–3472, https://doi.org/10.1007/s00024-015-1049-2, 2015. 
Billen, M. I., Gurnis, M., and Simons, M.: Multiscale dynamics of the Tonga-Kermadec subduction zone, Geophys. J. Int., 153, 359–388, https://doi.org/10.1046/j.1365-246X.2003.01915.x, 2003. 
Cortés, P., Catalán, P. A., Aránguiz, R., and Bellotti, G.: Tsunami and shelf resonance on the northern Chile coast, J. Geophys. Res.-Oceans, 122, 7364–7379, https://doi.org/10.1002/2017JC012922, 2017. 
GEBCO: Global ocean & land terrain models, GEBCO [code], https://www.gebco.net/data_and_products/gridded_bathymetry_data/, last access: 29 March 2022. 
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Short summary
Tsunami waveforms contain the features of its source, propagation path, and local topography. On 4 March 2021, two tsunamis were generated by earthquakes in the Kermadec Islands, New Zealand, within 2 h. This rare case gives us a valuable opportunity to study the characteristics of two tsunamis. We analyzed the records of two tsunamis at tide gauges with spectral analysis tools. It is found that two tsunamis superpose during the few hours after the arrival of the second tsunami.
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