57 Fun Facts About Ring of Fire

Despite its name, the Ring of Fire is usually described as having which shape?

A horseshoe: the Ring runs up the Americas, across to Asia and down to New Zealand, but its two ends never meet, because its chain of trenches and volcanoes breaks off in the far southern Pacific.

The Ring of Fire's 40,000 km length is close to which distance?

Around the Earth at the equator is 40,075 km. The near-round figure is no accident: the metre was first defined so that the distance from pole to equator would be 10,000 km.

Roughly what share of the world's earthquakes strike along the Ring of Fire?

About 90 percent, including most of the very largest: nearly all the way round, ocean floor is being forced under the neighbouring plates, and the two sides stick for years, then slip.

Which Pacific island nation's undersea volcano produced the biggest atmospheric blast ever recorded by instruments, in January 2022?

Tonga's Hunga Tonga-Hunga Ha'apai volcano sent shock waves right around the globe, and its booms were heard on the far side of the Pacific, more than 9,000 km away.

Which of these is another name for the Ring of Fire?

The Circum-Pacific belt is its plainer name. The fiery one suits the word volcano itself, which comes from Vulcan, the Roman god of fire.

Which volcanic islands are left out of the Ring of Fire because a hotspot, rather than colliding plates, feeds their eruptions?

Hawaii sits in the middle of the Pacific plate, thousands of kilometres from the nearest plate edge, so its volcanoes are fed by a plume of hot rock rising from deep below.

Which oceanic plate is sliding beneath South America's Pacific coast, pushing up the Andes?

Nazca's dense ocean floor sinks beneath the lighter continent, and the squeeze crumples South America's edge upward into the Andes.

Mount St. Helens and its neighbours are fed by the sinking of which small remnant of the Farallon plate?

Juan de Fuca is a leftover scrap of the once-vast Farallon plate, most of which has already been swallowed beneath North America; this piece is still sinking under the Pacific Northwest.

Along the East Pacific Rise, the long undersea ridge west of South America, the plates are doing what?

Spreading apart: along ridges such as the East Pacific Rise new sea floor is made instead of swallowed, so there is none of the plate-under-plate melting that builds the Ring's explosive volcanoes.

Which continent is excluded from the Ring of Fire because it sits in the middle of its tectonic plate?

Australia rides in the centre of its plate, with no plate boundary on the continent, so its mainland has no erupting volcanoes, while New Zealand and Papua New Guinea, on the plate's edges, have dozens between them.

What kind of volcano, like Mount St. Helens and Mount Fuji, is typical of the Ring of Fire?

Stratovolcanoes are built up in layers, falls of ash alternating with lava flows; their sticky, gas-rich magma piles into steep cones and erupts far more violently than the runny lava of broad shield volcanoes.

Which ice-capped volcano towering over Tacoma and Seattle is rated among the most dangerous in the world?

Mount Rainier is loaded with glacier ice that an eruption could turn into mudflows able to run down the river valleys to Puget Sound; one about 500 years ago buried the valley floor where the town of Orting now stands.

Which volcano burst out of a farmer's cornfield in 1943 and kept growing for nine years?

Parícutin began as a crack in a cornfield, built a cone hundreds of metres high and buried the nearby town of San Juan under lava before it fell silent in 1952.

Oregon's Crater Lake fills the hole left when which volcano collapsed about 7,700 years ago?

Mount Mazama threw out so much molten rock that its summit fell in on itself, and the pit later filled with water to become the deepest lake in the country.

Which country was hit in 1960 by the largest earthquake ever recorded?

Chile's Valdivia earthquake reached about magnitude 9.5, and its tsunami crossed the whole Pacific: many hours later it was still deadly on the coast of Japan.

The tsunami from the largest earthquake ever recorded, in 1960, devastated which city on Hawaii's Big Island?

Hilo's sirens had sounded hours earlier, but hundreds of people were still on low ground, and others had come back after a small first wave, when the highest one struck and killed 61.

Which Andean peak is the highest volcano on Earth?

Ojos del Salado has no confirmed eruption in recorded history, though its summit still vents gas, and in 2023 a Porsche was driven above 6,700 metres on its slopes, a world record for a car.

Villarrica, in the southern Andes, is one of the few volcanoes in the world with what in its crater?

An active lava lake glows in Villarrica's crater, though it comes and goes; the deadlier threat is on its flanks, where eruptions melt snow and ice into mudflows, as in 1964 and 1971.

Cotopaxi, among the world's highest active volcanoes, rises south of which capital city?

Quito sits just to its north. In 1877 an eruption melted Cotopaxi's summit snow and ice into mudflows that ran about 100 km down the valleys, some as far as the Pacific.

In 1985 mudflows from the volcano Nevado del Ruiz buried the town of Armero, killing over 20,000, in which country?

Colombia's Nevado del Ruiz had only a small eruption, but it melted part of the summit's ice, and the mudflows that followed were the deadliest in recorded history.

Which Japanese port city was devastated by the Great Hanshin earthquake of January 1995?

Kobe took most of the deaths, and a stretch of its elevated expressway, a structure supposed to withstand earthquakes, toppled over.

Popocatépetl is the second-highest peak in Mexico after which mountain?

Pico de Orizaba is also the highest volcano in North America. Popocatépetl is the restless one of the pair: it woke in December 1994 after decades of quiet.

What did an earthquake set off at Mount St. Helens on 18 May 1980, uncorking the eruption?

A giant landslide, the largest ever recorded on land: the bulging north face slid away, and the pressure it released let the volcano burst out sideways in a blast that killed about 57 people.

Mount St. Helens blew its top in May 1980 in which US state?

Washington: the eruption rated 5 out of 8 for explosivity, killed 57 people and left the mountain about 400 metres shorter than it had been that morning.

What is the magnitude-9.2 earthquake that shook Anchorage in 1964, the second-largest ever recorded, commonly called?

The Good Friday earthquake struck at 5:36 pm on 27 March 1964, the Friday before Easter, and the ground went on shaking for about four and a half minutes.

Novarupta, site of the 20th century's largest volcanic eruption in 1912, lies in which US state?

Alaska's Novarupta was so remote that for about 40 years the blast was blamed on nearby Mount Katmai, whose summit caved in as the magma drained from beneath it.

Mount Pinatubo's 1991 eruption buried Clark Air Base in ash, so which country's air force abandoned it that year?

The United States had already moved its 15,000 people off the base: forecasts by Philippine and American scientists got the area evacuated before the blast, saving at least 5,000 lives.

Which peninsula in the Russian Far East holds one of the densest clusters of active volcanoes on Earth?

Kamchatka lies right where the Pacific plate dives beneath Asia, and the melting that sets off feeds chain upon chain of volcanoes, many of them still erupting.

Which New Zealand island volcano erupted in December 2019 while 47 tourists and guides were on it?

White Island, known in Māori as Whakaari, is New Zealand's most active cone volcano, a private reserve that had drawn sightseers for decades; the sudden blast killed 22 of the people ashore.

Japan, home to 111 active volcanoes, is dotted with thousands of natural hot-spring baths known by what name?

Onsen are not only for people: in Nagano's Jigokudani valley, wild snow monkeys come down from the cliffs each winter to sit in the steaming water.

Ash from Mount Fuji's last eruption, in 1707, fell on which city about 100 km away?

Tokyo, then called Edo, was coated in ash. The eruption came just 49 days after one of the biggest earthquakes in Japan's history, and Fuji has not erupted since.

The 2011 Tōhoku earthquake shifted which of Japan's four main islands a few metres to the east?

Honshu, the largest of the four, lurched east, and the shift of so much rock sped up Earth's spin enough to shorten the day by about 1.8 millionths of a second.

Challenger Deep, the deepest known point in any ocean, lies in which trench of the Ring of Fire?

The Mariana Trench drops to nearly 11,000 metres there, deep enough to swallow Mount Everest with two kilometres to spare; two men first reached the bottom in 1960, in the bathyscaphe Trieste.

When one oceanic plate dives beneath another oceanic plate, what forms on the plate above?

A volcanic island arc: lava piles up on the sea floor for millions of years until the volcanoes break the surface as a curved chain of islands beside the trench, like the Aleutians.

Which volcano, famed for its almost perfectly symmetrical cone, is the most active in the Philippines?

Mayon's beauty is deceptive: its most violent eruption, in 1814, killed about 1,200 people and wrecked several towns at its foot.

Which Indonesian volcano exploded in 1883 with a blast heard thousands of kilometres away in Perth?

Krakatoa's blast is often called the loudest sound in recorded history, but it was the sea that did the killing: most of its 36,000 victims drowned in the tsunamis that followed.

Why do many geologists leave the volcanoes of Sumatra and Java out of the Ring of Fire?

They border the Indian Ocean, where the plate boundary that feeds them runs along the islands' southern side, so many geologists file them in a separate belt; news reports usually count them in the Ring anyway.

Mount Tambora's 1815 eruption, the most powerful on record, caused what global event in 1816?

The Year Without a Summer left one lasting souvenir: its endless rain kept Mary Shelley indoors by Lake Geneva, where a ghost-story contest with Lord Byron produced Frankenstein.

New Zealand's largest historical eruption, in 1886, was at which volcano?

Mount Tarawera tore open along a 17 km rift within hours, burying three villages and the Pink and White Terraces, then the country's most famous tourist sight and long presumed destroyed.

The 1953 Tangiwai rail disaster, which killed 151, was caused by a lahar from which New Zealand volcano?

Mount Ruapehu's crater lake burst through the dam of volcanic ash that held it, and the surge of mud knocked out a bridge pier only minutes before the Christmas Eve express arrived.

Which capital, built on an old lake bed, was devastated in 1985 by an earthquake centred hundreds of kilometres away?

Mexico City sits on the soft bed of a vanished lake, which made the damage far worse, and at least 5,000 people died; the public alert system built afterwards now gives it tens of seconds of warning.

The Alpide belt, the world's second most earthquake-prone zone after the Ring of Fire, takes in which mountain range?

The Himalayas rise where India is still ramming into Asia: two continents meeting head-on, with neither able to sink beneath the other, so the crust buckles upward instead.

What has drawn farmers onto the slopes of Ring of Fire volcanoes for centuries?

Fertile soil from ash is the irony of the Ring of Fire: the eruptions that threaten people also lay down some of the world's richest farmland, so the danger zones fill up.

Which naturalist, ashore in South America during the great earthquake of 1835, recorded that it had raised the coast?

Charles Darwin reported the find of the Beagle's captain: mussel beds stranded about three metres above the tide line, a continent caught in the act of rising from the sea.

Because Earth bulges at the equator, the summit of which Ecuadorian volcano is the farthest point from the planet's centre?

Chimborazo stands one degree from the equator, where the spinning Earth is fattest, so its summit is about two kilometres farther from the planet's centre than the top of Everest.

Santa María, a volcano above Quetzaltenango, produced one of the 20th century's biggest eruptions in which country?

Guatemala's Santa María had never erupted in recorded history before it blew out its own flank in 1902; a new lava dome, Santiaguito, has been growing in the scar since 1922.

Mount Meager, which blasted ash as far as Alberta some 2,400 years ago, stands in which part of Canada?

British Columbia's Mount Meager is Canada's answer to Mount St. Helens: its blast was much like the American one in 1980, with a column of ash about 20 km high that the westerly winds spread across two provinces.

Taal, a volcano on a lake island, erupted in January 2020 and showered which capital with ash?

Manila, to the north, saw its schools and government offices shut and every flight at its airport put on hold as the ash came down.

Which Peruvian city, built largely of pale volcanic stone, sits at the foot of the volcano Misti?

Arequipa, Peru's second city, was rebuilt after its earthquakes in sillar, a white volcanic rock; more than a million people now live below Misti, whose crater still vents gas.

Canada's largest recorded earthquake, magnitude 8.1 in 1949, struck off which coast?

Haida Gwaii shook so hard that cows were knocked off their feet. The islands lie beside the Queen Charlotte Fault, Canada's answer to the San Andreas, where two plates grind sideways past each other.

Which chain of volcanic islands, strung between Japan and Russia's far east, is partly claimed by both countries?

The Kuril Islands were taken by the Soviet Union in 1945, and Japan still claims the four southernmost; as of 2025 the quarrel had kept the two countries from ever signing a peace treaty.

The 1923 Great Kantō earthquake levelled much of Japan's capital and which port city?

Yokohama was almost wiped out. The quake struck just before noon, when cooking stoves were lit for lunch, and the fires they started spread through both cities; Japan still holds disaster drills every 1 September.

The 2011 tsunami caused three meltdowns at Japan's Fukushima Daiichi plant by knocking out what?

Power for its cooling pumps: the three working reactors had shut down safely when the earthquake struck, but the waves drowned the backup generators and the fuel overheated.

Which Japanese volcano was an island until lava from its 1914 eruption joined it to the mainland?

Sakurajima's 1914 eruption also buried a shrine's torii gate so deep that only its very top still shows above the ground.

Which California city was largely destroyed in 1906 by an earthquake and the fires that followed?

San Francisco lost more to the flames than to the shaking: the fires burned for days, levelled some 500 city blocks and left about 250,000 people homeless.

Which New Zealand city lost 185 people when an earthquake struck at lunchtime on 22 February 2011?

Christchurch had ridden out a stronger quake five months earlier; the 2011 shock was weaker but only 5 km deep and almost directly beneath the city.

Why do geologists regard the Northern Cordilleran Volcanic Province as a gap in the Ring of Fire?

The province lies between the Cascade Volcanic Arc to the south and Alaska's Aleutian Arc to the north.