In recent years, two mysterious small magnitude tsunamis struck not only New Zealand's North Island, but also a stretch of islands to the north such as White Island, Cheesehead Island, & Raoul Island. While these tsunamis were immediately traced to oringinating around the time a magnitude 5.8 earthquake occurred, this presented a problem. As, this quake was seemingly more than 1.3 full magnitudes too small to have been considered capable of producing a tsunami in the traditional sense. So, why did this tsunami occur, and how was it related to the Curtis Island volcano?

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Note: The hypothesis that each of the two volcanic calderas will one day produce another tsunami is purely based on the opinion of GeologyHub.

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Sources/Citations:
[1] Sandanbata, O., Watada, S., Satake, K., Kanamori, H., & Rivera, L. (2023). Two volcanic tsunami events caused by trapdoor faulting at a submerged caldera near Curtis and Cheeseman Islands in the Kermadec Arc. Geophysical Research Letters, 50, e2022GL101086. https://doi.org/10.1029/2022GL101086, CC BY 4.0.
Note: The tsunami heights and time it took to reach various locations were completely sourced from this paper. Only the 100centimeter tsunami height figure on Cheeseman Island was an estimate by GeologyHub.
[2] Sandanbata, O., Watada, S., Satake, K., Kanamori, H., Rivera, L., & Zhan, Z. (2022). Subdecadal volcanic tsunamis due to submarine trapdoor faulting at Sumisu caldera in the Izu–Bonin Arc. Journal of Geophysical Research: Solid Earth, 127, e2022JB024213. https://doi.org/10.1029/2022JB024213, CC BY 4.0
[3] Tani, K., Fiske, R.S., Tamura, Y. et al. Sumisu volcano, IzuBonin arc, Japan: site of a silicic calderaforming eruption from a small openocean island. Bull Volcanol 70, 547–562 (2008). https://doi.org/10.1007/s0044500701...
[4] U.S. Geological Survey

0:00 A New Zealand Tsunami
2:06 Calderas
2:55 Trapdoor Tsunami Model
3:59 Relation to 2023 Events?