Pacific Ocean sea-level records of the 5 March 2021 triplet of tsunamis
On 5 March 2021, at 2.27 AM local time (4 March 2021, 13:27:34 UTC), a Mw 7.3 earthquake woke up the North Island of New Zealand with strong and long shaking. Its epicentre was located about 170 km NE offshore Gisborne in the Hikurangi subduction zone.
This was the first tsunami of a triplet occurring on the same day. The tsunami propagated from the source region to the north shore of New Zealand, with a very localised and limited impact. Maximum amplitudes of ~32.3 cm and ~6.6 cm were respectively recorded at East Cape (LOTT) and North Cape (NCPT) coastal tsunami gauges, located ~105 km and ~660 km away from the epicentre. At 6.41 AM (17:41:23 UTC), 4 hours and 14 minutes later, another earthquake triggered a tsunami in the southwestern Pacific region with a magnitude Mw 7.4 earthquake. This was located further north (~ 900 km) than the previous one, 50 km south of Raoul Island (New Zealand) on the Kermadec subduction zone. At 8.28 AM (19:28:33 UTC), 1 hour and 47 minutes later, a Mw 8.1 earthquake occurred very close to the earlier Mw 7.4 earthquake, 80 km southeast of Raoul Island. It triggered a third tsunami that was recorded on New Zealand DART stations and coastal gauges, and all around the Pacific Ocean. Those data presents the arrival times and amplitudes of the first and third tsunamis on the New Zealand coastal gauges.
DOI: https://doi.org/10.21420/P606-J332?x=y
Cite data as:
GNS Science. (2021). Pacific Ocean sea-level records of the 5 March 2021 triplet of tsunamis [Data set]. GNS Science. https://doi.org/10.21420/P606-J332?x=y
Simple
- Date (Creation)
- 2021-03-05
- Purpose
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This webpage presents the triplet of tsunamis on 5 March 2021 accompanied by the tsunami arrival times and wave amplitudes in New Zealand.
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tsunami modelling
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inundation
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propagation
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model output
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tsunami height
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sea-level
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triplet of tsunamis
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Pacific Ocean
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Creative Commons Attribution-ShareAlike 4.0 International License ( https://creativecommons.org/licenses/by-sa/4.0/ )
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- Geoscientific information
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https://www.gns.cri.nz/Home/Our-Science/Natural-Hazards-and-Risks/Tsunami/2021-Tsunami-Triplet WWW:DOWNLOAD-1.0-http--download
https://huta22.gns.cri.nz/metadata/srv/api/records/000ecc32-d3cf-443c-a971-f6ad32303c9b/attachments/Tables_1-2.xlsx
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More information can be found in the following references:
De Lange, W.P., Healy, T.R. (1986). New Zealand tsunamis 1840-1982. New Zealand Journal of Geology and Geophysics, 29(1), 115-134, https://doi.org/10.1080/00288306.1986.10427527 .
Fry, B., McCurrach, S.-J., Gledhill, K., Power, W., Williams, M., Angove, M., Arcas, D., Moore, C. (2020). Sensor network warns of stealth tsunamis. EOS, 101, https://doi.org/10.1029/2020EO144274, Published on 26 May 2020 .
Gusman, A. (2021). Tsunami DART observations and simulation of the 2021 Raoul Island Mw 8.1 earthquake. GNS Science. https://doi.org/10.21420/FQT1-TR97 .
Kornei, K. (2021). Ocean Sensors Record Rare Triple Tsunami near New Zealand. EOS, 102, https://doi.org/10.1029/2021EO157676, Published on 29 April 20 21.
Luis, J., (2007). Mirone : A multi-purpose tool for exploring grid data. Computers & Geosciences, 33(1), 31-41, https://doi.org/10.1016/j.cageo.2006.05.005.
Roger, J. (2021). 5 March 2021 post-tsunami field survey in Whangarei. GNS Science Report, 10 pp. in review.
Strasser, F.O., Arango, M.C., Bommer, J.J. (2010). Scaling of the source dimensions of interface and intraslab subduction-zone earthquakes with moment magnitude. Seismological Research Letters, 81(6), 941-950, https://doi.org/10.1785/gssrl.81.6.94 1.
Todd, E.K., Lay, T. (2013). The 2011 Northern Kermadec earthquake doublet and subduction zone faulting interactions. Journal of Geophysical Research, Solid Earth, 118(1), 249-261, https://doi.org/10.1029/2012JB0097 11.
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- Dataset
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Dataset
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- 2024-06-25T23:55:17.287374Z
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ISO 19115:2003/19139
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1.0
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Organisation name Individual name Electronic mail address Role GNS Science
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