How Did a New Tongan Island Disappear?

Introduction

In early 2015, a brand-new island appeared in the Kingdom of Tonga after an underwater volcanic eruption linked two older islets, Hunga Tonga and Hunga Ha’apai. To many observers it looked almost miraculous: a stretch of land rose from the Pacific where none had existed before. Even more surprising, scientists who expected it to wash away within months watched it survive for years instead. Then, in January 2022, one of the most powerful volcanic eruptions ever recorded in the modern era largely destroyed the new land, leaving only fragments above sea level. The story has become one of Tonga’s most remarkable modern natural mysteries—not because it defies science, but because nature behaved on a timescale that few people ever witness.[NASA Science]science.nasa.govScience New Island Made of Tuff StuffNASA ScienceNew Island Made of Tuff Stuff - NASA ScienceDecember 12, 2017…Published: December 12, 2017

How did a new Tongan island appear?

The island commonly called Hunga Tonga-Hunga Ha’apai was born during a submarine eruption that began in December 2014. Explosive interaction between seawater and rising magma blasted ash, steam and volcanic rock high into the atmosphere. As the eruption continued, ash and fragmented volcanic material accumulated between the pre-existing islands of Hunga Tonga and Hunga Ha’apai until they became joined by a fresh cone of volcanic debris.[NASA Science]science.nasa.govScience New Island Made of Tuff StuffNASA ScienceNew Island Made of Tuff Stuff - NASA ScienceDecember 12, 2017…Published: December 12, 2017

At first, volcanologists assumed the island would be extremely short-lived. Similar ash islands often disappear rapidly because waves erode the loose volcanic deposits. Earlier examples elsewhere in the Pacific had survived only months before returning beneath the sea. Instead, the new Tongan island resisted erosion far better than expected.[NASA Science]science.nasa.govScience New Island Made of Tuff StuffNASA ScienceNew Island Made of Tuff Stuff - NASA ScienceDecember 12, 2017…Published: December 12, 2017

For anyone unfamiliar with volcanic landscapes, the speed of the change was astonishing. Maps had to be updated almost immediately. Satellite photographs captured an entirely new feature on Earth’s surface forming within weeks—a reminder that coastlines are not always as permanent as they appear.

Why NASA became fascinated

The island quickly attracted worldwide scientific attention because opportunities to watch a volcanic island being born are exceptionally rare.

NASA researchers realised they had an unprecedented natural laboratory. High-resolution satellites could repeatedly photograph the island, allowing scientists to measure how cliffs collapsed, beaches shifted and vegetation slowly began colonising the fresh volcanic surface. Because the island formed during the satellite era, researchers could follow its development far more closely than famous earlier examples such as Iceland’s Surtsey.[NASA]nasa.govShows New Tongan Island Made of Tuff Stuff, Likely to Persist YearsNASA Shows New Tongan Island Made of Tuff Stuff, Likely to Persist Years - NASADecember 11, 2017…Published: December 11, 2017

The biggest surprise was its durability. Chemical reactions between volcanic ash and seawater gradually transformed the loose deposits into stronger rock called tuff, making the island much harder to erode than first predicted. NASA researchers estimated that, rather than surviving only a few months, the island might persist anywhere from roughly six to thirty years, with some modelling suggesting an even longer lifespan under favourable conditions.[NASA Science]science.nasa.govScience New Island Made of Tuff StuffNASA ScienceNew Island Made of Tuff Stuff - NASA ScienceDecember 12, 2017…Published: December 12, 2017

The island also offered an unexpected bonus. Scientists studying Mars noted that similar volcanic landforms exist there, so understanding how the Tongan island evolved could help explain ancient Martian landscapes shaped by volcanic explosions involving water.[NASA Science]science.nasa.govScience New Island Made of Tuff StuffNASA ScienceNew Island Made of Tuff Stuff - NASA ScienceDecember 12, 2017…Published: December 12, 2017

Why it felt almost Fortean

Although entirely natural, the island’s story has many qualities that make it feel like classic Fortean material.

A piece of land apparently emerged from nowhere, survived against expert expectations and then largely vanished again. For centuries, stories of disappearing islands belonged mostly to maritime folklore, mistaken navigation or mythical geography. Here, however, satellites documented every stage.

The sequence also challenged ordinary assumptions about permanence. Most people imagine islands as ancient fixtures. Hunga Tonga-Hunga Ha’apai instead behaved like a living landscape, visibly changing from month to month. To the public, satellite time-lapse images resembled something closer to science fiction than everyday geology.[NASA Scientific Visualization Studio]svs.gsfc.nasa.govNASA Scientific Visualization StudioNASA SVS | The Birth of a New Island: Press MaterialsDecember 11, 2017…Published: December 11, 2017

Unlike legendary phantom islands reported by sailors, however, this one was never in doubt. It could be measured, photographed and visited. The mystery lay not in whether it existed, but in how quickly existence itself could change.

What happened in 2022?

In late December 2021 the volcano reawakened. Activity intensified dramatically during January 2022 before culminating in the colossal eruption of 15 January.

The explosion generated one of the largest volcanic plumes ever observed, atmospheric shock waves that travelled around the globe and tsunami waves across the Pacific. The eruption devastated parts of Tonga and fundamentally reshaped the volcano itself. The island that scientists had spent years studying was largely obliterated.[si.edu]volcano.si.eduOpen source on si.edu.

Satellite imagery after the eruption revealed that most of the land created during 2014–15 had disappeared beneath the sea. Only remnants of the older islands remained visible above water. What had seemed a surprisingly durable landscape proved temporary after all—just not in the way originally expected.[Smithsonian Global Volcanism Program]volcano.si.eduOpen source on si.edu.

Subsequent mapping of the seabed showed that the eruption had transformed the volcano on an enormous scale, excavating a vast cavity beneath the ocean while redistributing immense volumes of volcanic material across the surrounding seafloor.[Herald Sun]heraldsun.com.auHerald Sun Tassie Tonga lifeline: Huge blast's sea studyTheir mission is to examine how marine ecosystems near the explosion site—now a 1000-meter-deep hole in the seafloor—are recovering. The…

What does the vanished island tell us?

The disappearance of Hunga Tonga-Hunga Ha’apai illustrates an important point about volcanic islands: “vanished” does not necessarily mean erased forever.

The volcano remains active, and future eruptions could once again build new land above sea level. Throughout geological history, islands have repeatedly emerged, eroded and re-emerged along volcanic arcs such as Tonga’s. Human timescales simply rarely overlap with these cycles.[Smithsonian Global Volcanism Program]volcano.si.eduOpen source on si.edu.

For geologists, the island became one of the best-documented examples of the complete life cycle of a young volcanic island—from birth to destruction—in the age of continuous satellite observation.

For readers interested in strange history, it demonstrates how genuine natural events can resemble legends. A landmass appears from the sea, becomes famous worldwide, inspires speculation about its future, then largely disappears within a single decade. No supernatural explanation is required, yet the story retains exactly the sense of wonder that often gives rise to folklore.

Why the story endures

Among Tonga’s modern strange-history episodes, the vanished island occupies a distinctive place because every stage was witnessed in real time.

The island’s appearance challenged scientific expectations by surviving longer than anticipated. Its destruction exceeded almost everyone’s expectations by occurring during an eruption of extraordinary global significance. Between those two moments, it became a living laboratory watched from orbit, visited by researchers and followed by millions through satellite imagery.

The result is an unusual blend of geology and modern myth-making. Unlike traditional tales of phantom islands glimpsed through mist, Hunga Tonga-Hunga Ha’apai was an island that truly appeared, truly changed and, for the most part, truly vanished again—leaving behind one of the most memorable natural stories associated with Tonga.[nasa.gov]science.nasa.govScience The New and the Lost World of Hunga Tonga-Hunga Ha’apaiNASA ScienceThe New and the Lost World of Hunga Tonga-Hunga Ha’apai - NASA Science…

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Endnotes

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Title: Science New Island Made of Tuff Stuff
Link:https://science.nasa.gov/earth/earth-observatory/new-island-made-of-tuff-stuff-91412/

Published: December 12, 2017

2. Source: ntrs.nasa.gov
Link:https://ntrs.nasa.gov/citations/20180007794

3. Source: nasa.gov
Title: Shows New Tongan Island Made of Tuff Stuff, Likely to Persist Years
Link:https://www.nasa.gov/centers-and-facilities/goddard/nasa-shows-new-tongan-island-made-of-tuff-stuff-likely-to-persist-years/

Published: December 11, 2017

4. Source: svs.gsfc.nasa.gov
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Published: December 11, 2017

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Title: Science The New and the Lost World of Hunga Tonga-Hunga Ha’apai
Link:https://science.nasa.gov/blogs/earth-expeditions/2019/10/21/the-new-and-the-lost-world-of-hunga-tonga-hunga-haapai/

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Title: Science Hunga Tonga-Hunga Ha‘apai Erupts
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Published: January 19, 2022

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8. Source: nasa.gov
Title: Tonga Eruption Blasted Unprecedented Amount of Water Into Stratosphere
Link:https://www.nasa.gov/centers-and-facilities/goddard/tonga-eruption-blasted-unprecedented-amount-of-water-into-stratosphere

Published: August 2, 2022

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Title: dramatic changes at hunga tonga hunga haapai 149367
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Published: January 15, 2022

17. Source: youtube.com
Link:https://www.youtube.com/watch?v=d_k6A-kIovs

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19. Source: volcano.si.edu
Link:https://volcano.si.edu/volcano.cfm?vn=243040

20. Source: heraldsun.com.au
Title: Herald Sun Tassie Tonga lifeline: Huge blast’s sea study
Link:https://www.heraldsun.com.au/news/tasmania/tassie-team-to-seek-volcano-eruption-clues-in-survey/news-story/e09ad6cc44f5898aed6de22710937973

21. Source: volcano.si.edu
Link:https://volcano.si.edu/showreport.cfm?doi=10.5479%2Fsi.GVP.BGVN202203-243040

Published: March 1, 2022

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Title: 47, no. 2 (February 20
Link:https://volcano.si.edu/showreport.cfm?doi=10.5479%2Fsi.GVP.BGVN202202-243040&lang=en

Published: February 1, 2022

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Published: January 19, 2022

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Published: December 29, 2021

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Published: December 15, 2021

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Additional References

28. Source: smithsonianmag.com
Link:https://www.smithsonianmag.com/blogs/national-museum-of-natural-history/2025/12/19/for-25-years-the-smithsonians-global-volcanism-program-has-kept-weekly-tabs-on-volcanic-eruptions-around-the-world-heres-how-they-do-it/

Published: December 19, 2025

29. Source: smithsonianmag.com
Link:https://www.smithsonianmag.com/smart-news/tongas-volcanic-eruption-blasted-an-enormous-plume-of-water-vapor-into-the-atmosphere-180980538/

Published: August 8, 2022

30. Source: theguardian.com
Title: diary of a disaster the week that tonga went silent
Link:https://www.theguardian.com/world/2022/jan/21/diary-of-a-disaster-the-week-that-tonga-went-silent

31. Source: smithsonianmag.com
Title: The Hunga-Tonga-Hunga-Ha’apai volcano that er
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Published: January 18, 2022

32. Source: sciencedirect.com
Title: The cataclysmic eruption onset on January
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33. Source: youtube.com
Title: Volcanic eruption in Tonga reshaped Pacific seafloor
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34. Source: youtube.com
Title: A New Volcanic Island has Formed in Tonga
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35. Source: youtube.com
Title: A New Time-lapse of an Island Forming in Tonga
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36. Source: youtube.com
Title: NASA Sees Tonga Island’s Unexpected Life and Fate
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37. Source: youtube.com
Title: New island forms in Tonga
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