60 Fun Facts About Ring of Fire

Roughly how wide is the Ring of Fire at its broadest?

It is also called the Circum-Pacific belt, the Rim of Fire and the Girdle of Fire.

Roughly how long is the Ring of Fire?

It is up to about 500 km wide and has existed for more than 35 million years.

Approximately what share of the world's earthquakes occur within the Ring of Fire?

The next most active region, running through the Himalayas and southern Europe, is a distant second.

The Ring of Fire contains roughly what fraction of the world's active or dormant volcanoes?

The count runs from 750 to 915 depending on which disputed regions are included.

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

It is also called the Rim of Fire and the Girdle of Fire, names preserved from the old belief that volcanoes were fires burning inside the Earth.

Why are the Hawaiian Islands not part of the Ring of Fire?

Their volcanism comes from a hotspot in the middle of the Pacific plate.

Which three plates subduct beneath South America to create the Andean section of the Ring of Fire?

Subduction has been happening at South America's coast since the Jurassic, more than 145 million years ago.

The Cascade volcanoes are fed by the subduction of which small remnant of the Farallon plate?

Unusually, there is no oceanic trench off the Cascadia coast, partly because sediment from the Fraser, Columbia and Klamath rivers buries it.

Why does the Ring of Fire not run across the southern Pacific from New Zealand to South America?

The Pacific–Antarctic Ridge, East Pacific Rise and Chile Ridge are spreading centres, so any volcanism there is unrelated to subduction.

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

New Zealand, Tonga, Papua New Guinea and the Philippines nearby are all included.

What kind of volcano, like Mount St. Helens, makes up most Ring of Fire peaks above sea level?

They are built from explosive eruptions of tephra alternating with lava flows, mostly andesite.

What term did geologist Patrick Marshall coin in 1912 for the southwest Pacific boundary matching the Ring of Fire?

It separates islands with different volcano structures and lava types, and was later extended around the whole ocean.

Which disaster was the subject of Alexander P. Livingstone's 1906 book, an early source for 'great ring of fire'?

Volcanologist G. P. Scrope had described the chain of Pacific volcanoes as early as 1825.

Which is one of the Holocene's four largest eruptions, all at Ring of Fire volcanoes?

The others were Fisher Caldera in Alaska, Kurile Lake in the Russian Far East and Kikai Caldera in Japan; Mazama's collapse formed Crater Lake.

Which country holds the record for the largest earthquake ever recorded?

The 1960 Valdivia earthquake measured 9.4 to 9.6 and sent a tsunami as far as Hawaii, Japan and New Zealand.

The tsunami from the largest earthquake ever recorded, in 1960, devastated which Hawaiian city?

Waves there reached 10.7 metres; on the Chilean coast they were up to 25 metres high.

What is the world's highest active volcano, at 6,893 metres in the Andes?

Nearby Llullaillaco, at 6,739 metres, is the highest historically active volcano, last erupting in 1877.

Villarrica, in the southern Andes, is one of only five volcanoes known to have what in its crater?

Its lava is basaltic-andesitic, and melting snow often triggers lahars, as in 1964 and 1971.

Cotopaxi, which has erupted more than 50 times since 1738, is about 50 km south of which capital?

At 5,897 metres it is Ecuador's second-highest summit, and its mudflows have carved valleys around the cone.

The 1985 eruption of Colombia's Nevado del Ruiz produced a lahar that buried which town, killing about 25,000?

It remains the deadliest lahar in recorded history; similar but smaller disasters struck in 1595 and 1845.

The 1982 El Chichón eruption, which killed about 2,000, left what in place of the forested summit?

Before then the volcano was virtually unknown and no taller than the non-volcanic peaks around it.

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

It lies in the eastern half of the Trans-Mexican Volcanic Belt.

In which year did the Cascadia subduction zone last produce a magnitude-9 earthquake?

The zone could produce a magnitude 9.0 or greater quake again if the whole fault ruptured at once.

The 1980 eruption of Mount St. Helens began at 8:32 am on 18 May when an earthquake triggered what?

The whole weakened north face slid away, uncorking a lateral blast that killed about 57 people.

The 1980 St. Helens eruption was rated what on the Volcanic Explosivity Index?

It ejected 1.3 cubic kilometres of material, exceeding California's 1915 Lassen Peak eruption, and was the most significant in the contiguous US in recorded history.

Alaska's 1964 quake is the second-largest seismic event ever recorded. What is it commonly called?

The state has more than 50 volcanoes that have erupted since about 1760, many in the Aleutian Islands.

The largest volcanic eruption of the 20th century occurred in 1912 at which Alaskan volcano?

Pinatubo's 1991 eruption in the Philippines was the second largest.

Mount Pinatubo's climactic eruption on 15 June 1991 sent an ash cloud how high?

Lahars swept through the American Clark Air Base, and around 60,000 people had been evacuated beforehand.

Which peninsula in the Russian Far East is described as the most volcanic area of the Eurasian continent?

Its 19 active volcanoes are UNESCO-listed, and the 10,500-metre-deep Kuril–Kamchatka Trench runs just offshore.

Klyuchevskaya Sopka, at 4,750 metres, holds what distinction?

It is the highest of the peninsula's many volcanoes.

Roughly what share of the world's active volcanoes are found in Japan?

The 1923 Great Kantō earthquake there killed 130,000 people.

Mount Fuji, Japan's highest mountain at 3,776 metres, last erupted in which years?

The eruption ejected pumice and formed a large new crater on the east flank; the peak became a World Heritage cultural site in 2013.

The 2011 Tōhoku earthquake measured about 9.0 to 9.1. Where did it rank among quakes recorded since 1900?

The tsunami it caused led to the meltdown of three reactors at Fukushima Daiichi.

The Mariana Trench's Challenger Deep, the deepest known point on Earth, reaches roughly what depth?

That is more than 2 km further from sea level than the summit of Everest is above it.

The Mariana Arc is the textbook example of what forms when oceanic lithosphere subducts under oceanic lithosphere?

When oceanic crust dives under a continent instead, a continental arc forms, as along the Andean coast.

Which Philippine volcano is the country's most active?

Taal, by contrast, has had 33 recorded eruptions since 1572 and sits in a lake-filled caldera.

Krakatoa's third explosion on 27 August 1883 holds what record?

It was heard 3,110 km away in Perth and 4,800 km away on Rodrigues near Mauritius.

Why do many geologists exclude western Indonesian volcanoes like Krakatoa and Tambora from the Ring of Fire?

Indonesia sits at the intersection of the two belts, and popular science usually includes the whole country in the Ring.

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

Ash from Sumbawa spread worldwide and lowered global temperatures.

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

The country's earliest dated eruption was Whakaari in 1826, and most volcanism since comes from the Taupō Volcanic Zone.

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

The mudflow destroyed a rail bridge moments before the Wellington to Auckland express arrived on Christmas Eve.

Why is Antarctica's Mount Erebus not counted as part of the Ring of Fire?

Some geologists do include the Antarctic Peninsula and South Shetlands, but the rest of the continent is excluded.

Which region's subduction zone was the last to form, completing the Ring of Fire 35 million years ago?

The South American, North American and Asian zones date back around 115 million years, Indonesia and New Guinea about 70 million.

The Alpide belt, Earth's second most seismically active region, accounts for roughly what share of earthquakes?

It runs from central Indonesia to the northern Atlantic via the Himalayas and southern Europe, and still produces some of the largest quakes.

How steeply a subducting slab descends depends chiefly on what?

Older, denser crust in the western Pacific dives steeply; younger crust off South America descends at a shallow angle.

Which town did the 1902 eruption of Mount Pelée destroy in minutes, killing about 29,000?

Only three known survivors remained after the pyroclastic flow, the worst volcanic disaster of the 20th century, though the Caribbean arc lies outside the Ring of Fire.

Which Andean volcano on the Argentina-Chile border is the world's highest historically active one?

It stands 6,739 metres and last erupted in 1877, slightly lower than neighbouring Ojos del Salado, which has not erupted in historic times.

Which Guatemalan volcano's 1902 eruption was one of the 20th century's largest, rated VEI 6?

The blast ejected about 5.5 cubic kilometres of magma, only slightly less than Pinatubo in 1991, and its Santiaguito dome remains one of the world's most active volcanoes.

Which British Columbia volcano had a St. Helens-style explosive eruption about 2,350 years ago?

It is the most recent major catastrophic eruption in the Garibaldi Volcanic Belt, sending an ash column about 20 km into the stratosphere.

Which Philippine volcano has had 33 recorded eruptions since 1572, including a deadly one in 1911?

The 1911 eruption claimed more than a thousand lives, and the volcano erupted again in January 2020 after decades of unrest.

Which 5,976-metre Peruvian volcano began an eruption in 2016 that continued into 2025?

Sabancaya, Peru's most active volcano in the 2010s-2020s, rises about 100 km northwest of Arequipa in the southern Peruvian Andes.

Which stratovolcano is the most active in the northern Chilean Andes, with a major eruption in 1993?

The 1993 eruption sent pyroclastic flows as far as 8.5 km from the volcano and dropped ash hundreds of kilometres away.

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

The Queen Charlotte Fault there also produced a magnitude 7 quake in 1929 and a 7.4 in 1970.

Roughly how deep is the Kuril-Kamchatka Trench that runs offshore of the Kamchatka Peninsula?

Subduction of the Pacific plate at this trench fuels the peninsula's 20 historically active volcanoes.

About how many people died in Japan's 1923 Great Kantō earthquake?

Japan records as many as 1,500 earthquakes a year, but the Kantō disaster was the deadliest of the 20th century there.

Which volcano, the most active in the central Philippines, killed three climbers in a 1996 eruption?

It has erupted 25 times since 1866, and a June 2024 eruption displaced more than 1,000 people.

Which Japanese volcano above Lake Inawashiro had major phreatic eruptions in 806 and 1888?

Its largest cone, O-Bandai, sits inside a horseshoe-shaped caldera left when an earlier volcano collapsed about 40,000 years ago.

Roughly how many separate volcanic vents does the Cascade Volcanic Arc contain?

Among them are nearly 20 major volcanoes; volcanism in the arc began about 37 million years ago, though the highest peaks are under 100,000 years old.

How long is the Trans-Mexican Volcanic Belt that runs west to east across central-southern Mexico?

Its volcanoes are fed by subduction of the Cocos and Rivera plates; Popocatépetl alone has had more than 20 major eruptions since 1519.

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.