Secret tsunami that struck 2,500 years ago revealed in Fiji's oral traditions

We see a natural arch rock along the shore by the water.
The hole made when a spear was thrown by one god at the other, on the north coast of eastern Kadavu. (Image credit: Patrick Nunn, CC BY-ND)

About 2,500 years ago, a volcanic eruption in Fiji triggered a massive tsunami. How do scientists know this? We examined the oral traditions of Fiji's Indigenous people, whose storytelling describes a volcanic eruption — an event that left behind geologic clues — and a tsunami, which didn't leave behind any physical traces that survive today, our new study finds.

Our research in the journal Oral Tradition shows memories of a volcanic eruption in Fiji some 2,500 years ago were encoded in oral traditions through riddles, tales of fantastic beings flying through the sky, fighting each other and noisily drinking the ocean dry.

These oral traditions were never intended as fanciful stories, but rather as the pragmatic foundations of a system of local risk management.

Life-changing events

Around 2,500 years ago, at the western end of the island of Kadavu in the southern part of Fiji, the ground shook, the ocean became agitated, and clouds of billowing smoke and ash poured into the sky.

When the clouds cleared, the people saw a new mountain had formed, its shape resembling a mound of earth in which yams are grown. This gave the mountain its name — Nabukelevu, the giant yam mound. (It was renamed Mount Washington during Fiji's colonial history.)

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So dramatic, so life-changing were the events associated with this eruption, the people who witnessed it told stories about it. These stories have endured more than two millennia, faithfully passed on across roughly 100 generations to reach us today.

Scientists used to dismiss such stories as fictions, devalue them with labels like "myth" or "legend". But the situation is changing.

Today, we are starting to recognize that many such "stories" are authentic memories of human pasts, encoded in oral traditions in ways that represent the worldviews of people from long ago.

In other words, these stories served the same purpose as scientific accounts, and the people who told them were trying to understand the natural world, much like scientists do today.

Nabukelevu from the northeast, its top hidden in cloud. Inset: Nabukelevu from the west in 1827 after the drawing by the artist aboard the Astrolabe, the ship of French explorer Dumont d'Urville. (Image credit: lithograph by H. van der Burch after original artwork by Louis Auguste de Sainson. Wikimedia Commons; Australian National Maritime Museum, CC BY-SA)

Battle of the vu

The most common story about the 2,500-year-old eruption of Nabukelevu is one involving a "god" (vu in Fijian) named Tanovo from the island of Ono, about 35 miles (56 kilometers) from the volcano.

Tanovo's view of the sunset became blocked one day by this huge mountain. Our research identifies this as a volcanic dome that was created during the eruption, raising the height of the mountain several hundred feet.

Enraged, Tanovo flew to Nabukelevu and started to tear down the mountain, a process described by local residents as driva qele (stealing earth). This explains why even today the summit of Nabukelevu has a crater.

But Tanovo was interrupted by the "god" of Nabukelevu, named Tautaumolau. The pair started fighting. A chase ensued through the sky and, as the two twisted and turned, the earth being carried by Tanovo started falling to the ground, where it is said to have "created" islands.

We conclude that the sequence in which these islands are said to have been created is likely to represent the movement of the ash plume from the eruption, as shown on the map below.

Smaller offshore islands named in seven versions of the Nabukelevu story as having formed following the Nabukelevu eruption. Inset shows the possible trace of the ash cloud based on the stories. (Image credit: Patrick Nunn, CC BY-ND)

'Myths' based in fact

Geologists would today find it exceedingly difficult to deduce such details of an ancient eruption. But here, in the oral traditions of Kadavu people, this information is readily available.

Another detail we would never know if we did not have the oral traditions is about the tsunami the eruption caused.

In some versions of the story, one of the "gods" is so frightened, he hides beneath the sea. But his rival comes along and drinks up all the water at that place, a detail our research interprets as a memory of the ocean withdrawing prior to tsunami impact.

Other details in the oral traditions recall how one god threw a massive spear at his rival but missed, leaving behind a huge hole in a rock. This is a good example of how landforms likely predating the eruption can be retrofitted to a narrative.

Our study adds to the growing body of scientific research into "myths" and "legends", showing that many have a basis in fact, and the details they contain add depth and breadth to our understanding of human pasts.

The Kadavu volcano stories discussed here also show ancient societies were no less risk aware and risk averse than ours are today. The imperative was to survive, greatly aided by keeping alive memories of all the hazards that existed in a particular place.

Australian First Peoples' cultures are replete with similar stories.

Literate people, those who read and write, tend to be impressed by the extraordinary time depth of oral traditions, like those about the 2,500-year old eruption of Nabukelevu. But not everyone is.

In early 2019, I was sitting and chatting to Ratu Petero Uluinaceva in Waisomo Village, after he had finished relating the Ono people's story of the eruption. I told him this particular story recalled events which occurred more than two millennia ago — and thought he might be impressed. But he wasn't.

"We know our stories are that old, that they recall our ancient history," he told me with a grin. "But we are glad you have now learned this too!"

Acknowledgements: The original research was conducted in collaboration with Loredana Lancini and Rita Compatangelo-Soussignan (University of Le Mans), Meli Nanuku and Kaliopate Tavola (Fiji Museum), Taniela Bolea (University of the Sunshine Coast) and Paul Geraghty (University of the South Pacific).

This edited article is republished from The Conversation under a Creative Commons license. Read the original article.

Patrick Nunn
Professor of Geography, School of Law and Society, University of the Sunshine Coast

Patrick Nunn is professor of geography at the University of the Sunshine Coast in Australia and author of more than 360 peer-reviewed publications, many explaining how "myths and legends" are more likely to be authentic culturally-filtered memories of life-changing events witnessed long ago by our ancestors. His book The Edge of Memory (2018) makes the case for this and shows that some such stories recall events that happened more than 10,000 years ago. His latest book, Worlds in Shadow (2021), focuses on ancient "stories" about submerged lands throughout the world and asks whether these stories have lessons for us today.