Interesting, actually

5 November 2026 science 10 min read

The Volcano That Wrote Frankenstein

In April 1815, a mountain most of the world had never heard of blew itself apart on an island in Indonesia. A year later, in a rented villa on Lake Geneva, five bored young writers waiting out an endless cold rain had no idea why the weather wouldn't break — or what it was about to make one of them write.

On the night of April 10, 1815, the top third of a mountain called Tambora, on the Indonesian island of Sumbawa, tore itself apart. The sound carried as far as 1,600 miles in some directions — and reached the British colonial government on Java, roughly 800 miles away, clearly enough that officials there, including the lieutenant-governor, Thomas Stamford Raffles, assumed it was cannon fire from a naval battle or an attack on a nearby town, and sent ships and soldiers out to investigate. It wasn’t. It was a volcano ejecting something like 150 cubic kilometers of rock and ash — by most estimates several times more material than the famously catastrophic 1883 eruption of Krakatoa would later throw — in a region that had no way to report what had just happened to the rest of the world.

By the time anyone outside the Dutch East Indies understood the scale of it, the damage was already done in a way nobody alive could have traced back to its source. A column of ash and gas punched more than 25 miles into the stratosphere. Pyroclastic flows and a resulting tsunami killed an estimated 10,000 to 11,000 people outright on Sumbawa and the islands around it. Crops and water supplies on Sumbawa were wiped out so completely that famine and disease killed tens of thousands more in the months that followed — estimates for total deaths, direct and indirect, run from roughly 70,000 to over 90,000, making it the deadliest volcanic eruption in recorded history. It remains the only eruption of the last few hundred years rated a 7 on the Volcanic Explosivity Index, one tier below the civilization-ending “supervolcano” category.

For up to two days afterward, pitch darkness was reported on islands as far as 370 miles from the mountain, and fine ash fell more than 800 miles away. Trees and pumice washed into the sea formed floating rafts miles across, one of which turned up in the Indian Ocean, near Calcutta, nearly six months later. Tambora itself, which had stood roughly 14,100 feet tall before the eruption, lost close to a third of its own height in a single night, its summit collapsing into a caldera several miles wide.

That would be a complete, self-contained tragedy on its own, and for the people of Sumbawa and the surrounding islands who survived it, it was. What makes Tambora strange, to anyone looking back at it now, is what happened next, an ocean and a continent away, to people who would spend the rest of their lives with no idea the mountain even existed.

A planet that stopped keeping its seasons straight

Volcanic eruptions cool the planet by throwing fine sulfate particles into the stratosphere, where they spread out and reflect sunlight back into space before it ever reaches the ground. A large eruption can measurably lower global temperatures for a year or more; Tambora was large enough to do it on a scale the world hadn’t seen since before written climate records existed. By the following year, the Northern Hemisphere’s average summer temperature had dropped by roughly half a degree Celsius — enough, combined with the particular weather patterns of 1816, to produce what the people living through it would call, bitterly, “the year without a summer,” and less politely, “eighteen hundred and froze to death.”

The effects showed up first and most dramatically in New England. On June 6, 1816, snow fell across Massachusetts, New Hampshire, Vermont, and upstate New York — in June. Parts of Vermont reported five to six inches of it on the ground the following day. Lakes and rivers that should have been thawed for months iced over again. In central New Hampshire, the last killing frost of what passed for spring didn’t lift until June 11, leaving farmers barely ten weeks of frost-free growing season before the cold came back in late summer. Corn, the staple crop much of rural America depended on for flour and feed, failed almost completely from Maryland northward. Farmers replanted two and three times as each new planting died in the ground.

The human response was migration on a scale New England hadn’t seen before. Vermont alone reportedly lost more people to emigration in the eight months after the failed harvest than it had in the entire preceding decade, as families gave up on rocky, frozen farmland and joined what became known as “Ohio Fever” — a wave of resettlement into the Midwest that helped populate what were then the western frontier states. Across the Atlantic, the effects were just as severe: harvests failed in Ireland, Britain, France, and Germany, grain prices spiked, and parts of Switzerland and the German states saw famine and bread riots. Nobody involved had any way of connecting any of it to a mountain on the other side of the world that most of them had never heard of and never would.

A house party that couldn’t go outside

Among the people caught in that unseasonable, relentless cold was a twenty-eight-year-old English poet already notorious enough that he’d left his own country partly to escape the scandal trailing him. Lord Byron rented a lakeside mansion called the Villa Diodati, near the Swiss village of Cologny on Lake Geneva, in the summer of 1816. Nearby, a group that included the poet Percy Bysshe Shelley, his eighteen-year-old partner (soon wife) Mary Godwin Shelley, her stepsister Claire Clairmont, and Byron’s own personal physician, John William Polidori, had taken rooms to be close to him.

Lake Geneva in summer should have meant boating, walking, and the kind of outdoor socializing wealthy young Romantics built their reputations on. Instead, the weather — driven by the same stratospheric haze darkening skies and cooling temperatures across the hemisphere — delivered what Mary Shelley later described as “a wet, ungenial summer” of “incessant rain” that kept the group indoors for days at a stretch, watching lightning storms roll across the lake they couldn’t go out on.

Stuck together with nothing to do, Byron made a proposal on the evening of June 16, 1816: each of them should write a ghost story. It was meant as a parlor game to pass a miserable night. Byron himself produced only a fragment, later published separately, along with a brooding, apocalyptic poem called “Darkness” — written that same unnervingly dark, cold summer — imagining a sunless world where the ice has returned and humanity has destroyed itself for the last scraps of warmth and food. Percy Shelley, by most accounts, didn’t finish anything substantial. Polidori eventually expanded a fragment into a short story called “The Vampyre,” built partly on an idea Byron had tossed off and abandoned — and in doing so produced what’s widely credited as the first story to establish the modern vampire as a seductive, aristocratic figure rather than a shambling folk monster. It would go on to directly influence Bram Stoker’s “Dracula” more than eighty years later.

And Mary Shelley, after several nights of failing to come up with anything, had a waking nightmare about a scientist who assembles a creature from dead tissue and succeeds in giving it life — only to be horrified by what he’s made and abandon it. She turned that image into a short story, then kept expanding it over the following months into a full novel. It was published anonymously in 1818 as “Frankenstein; or, The Modern Prometheus.” She was twenty years old when she wrote it, and the book has never been out of print since.

Polidori’s story had a stranger afterlife than its author did. He didn’t publish “The Vampyre” himself; it appeared, without his permission, in the April 1819 issue of a London magazine called the New Monthly Magazine, under the heading “A Tale by Lord Byron.” Byron’s name alone was enough to make it an instant sensation across Europe — it was quickly translated, adapted for the stage, and reprinted again and again, almost always still crediting Byron. Polidori wrote to the magazine within weeks insisting the idea’s “groundwork” belonged to Byron but that he had written every word of the actual story himself; Byron, for his part, also denied authorship. The magazine’s eventual correction was halfhearted, and later editions quietly dropped Byron’s name from the title page without reliably replacing it with Polidori’s. He died in 1821, not yet twenty-six, still only inconsistently credited with having founded an entire genre.

Two of the foundational texts of modern horror fiction, in other words — the template for the sympathetic-but-monstrous vampire and the template for the man-made monster — came out of the same week, the same house, the same unrelenting bad weather. And that bad weather, as best climate historians can reconstruct it, traces back across a year and an ocean to the mountain that blew apart on Sumbawa.

A possible third thing: the bicycle

There’s one more thread sometimes added to this story, and it deserves to be handled more carefully than the other two, because historians genuinely disagree about it.

In June 1817 — the year after the failed harvests, when horses across Europe had been dying or being slaughtered in large numbers for lack of oats and hay to feed them — a German civil servant named Karl Drais rode a two-wheeled, steerable wooden contraption he called a “Laufmaschine,” or “running machine,” down a road near Mannheim. It’s recognized as the direct ancestor of the modern bicycle. Drais’s own biographer, Hans-Erhard Lessing, has argued from circumstantial evidence that Drais was motivated specifically by the collapse in horse availability that followed the 1816 famine — building a human-powered substitute for an animal that had become scarce and expensive.

Other historians are skeptical. A conference paper by researcher Jost Pietsch points out that crop losses in Drais’s own region of Baden were comparatively modest that year, that horse populations there don’t show the kind of 1817 collapse the theory requires, and that grain and bread prices in the wider region didn’t actually peak in the year the invention appeared. The climate historian Wolfgang Behringer has reportedly called drawing a straight causal line from the volcano to the bicycle “rather impudent.” Lessing’s defenders counter that strict press censorship around food shortages in 1816–17 means Drais simply couldn’t have stated his motive in print even if it was true, which is part of why the direct evidence is so thin either way.

So the honest version is this: the timing lines up suggestively, serious researchers have argued it both ways for years, and nobody has settled it. It’s worth knowing about as a live historical argument — not as a confirmed fact to file next to Frankenstein and the vampire.

One mountain, three unrelated outcomes

What makes Tambora worth returning to, more than two centuries later, isn’t just the scale of the immediate disaster, horrific as that was for the tens of thousands of people who lived near it and never got so much as a footnote in most Western accounts of “the year without a summer.” It’s the sheer length of the chain the eruption set off without anyone on the receiving end realizing there was a chain at all. A mountain erupts on an island most of the eruption’s eventual victims couldn’t have located on a map. The sky dims by a fraction most instruments of the day couldn’t even reliably measure. A year passes. Crops fail on the other side of the planet for reasons farmers attributed to bad luck, bad planning, or divine punishment. Families pack up and move west. And in a rented house on a lake in Switzerland, five young people who had planned on boating instead spend a miserable, rain-locked week doing nothing more consequential than trying to entertain each other — and accidentally invent two of the most durable monsters in Western fiction.

None of the people at Villa Diodati ever needed to know why the summer had gone wrong to be shaped by it. That’s the part that tends to stick: not that a volcano can kill tens of thousands of people directly, which is tragic but at least legible as cause and effect, but that the same eruption can reach a bored house party a year later and an ocean away, and leave behind a novel that’s still in print two hundred years on, without a single person in that room ever being able to point to the reason why the rain wouldn’t stop.

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