Three-quarters of the world’s volcanoes and nine-tenths of its earthquakes cluster along a single horseshoe-shaped belt around the Pacific Ocean — a scale of concentration found nowhere else on Earth.
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What the Circum-Pacific Belt is
- The Circum-Pacific Belt, popularly called the Ring of Fire, is a roughly 40,000 km horseshoe-shaped zone encircling the Pacific Ocean. It traces the boundaries of the Pacific Plate and its smaller neighbours.
Why it exists
- The belt marks a near-continuous chain of subduction zones. Here, dense oceanic plates sink beneath adjacent plates, generating volcanoes, earthquakes, and deep ocean trenches along the way.
Share of world volcanism
- About 75% of the world’s active and dormant volcanoes, roughly 452 in total, sit along this belt. It runs from South America’s Andes, up North America’s west coast, across to Asia, and down to New Zealand.
Share of world seismicity
- The belt produces about 90% of the world’s earthquakes, and roughly 81% of its largest earthquakes, according to the US Geological Survey. Most strike along its many subduction zones.
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Not a single fault
- The Ring of Fire is not one continuous fault line. It is a series of separate plate boundaries and subduction zones that happen to trace a connected path around the Pacific.
Deep ocean trenches
- Subduction carves deep trenches where the sinking plate bends downward. The Mariana Trench, part of this belt, holds the deepest known point on Earth’s ocean floor.
Volcanic arcs it includes
- Notable arcs along the belt include the Andes in South America, the Cascade Range in North America, the Aleutian Islands, the Kamchatka Peninsula, and the island arcs of Japan, the Philippines, and Indonesia.
Countries at highest risk
- Japan, Indonesia, the Philippines, Chile, and the western United States all sit directly on the belt. Their building codes and disaster planning reflect this constant seismic and volcanic exposure.
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Historic earthquakes it produced
- The belt has generated the largest earthquakes ever recorded: the 1960 Valdivia earthquake in Chile (magnitude 9.5), the 1964 Alaska earthquake (magnitude 9.2), and the 2011 Tohoku earthquake in Japan (magnitude 9.0), which triggered a devastating tsunami.
Why the hazard clusters so tightly
- Subduction zones store enormous strain as one plate grinds beneath another. When that strain releases suddenly, it produces both a major earthquake and, often, the magma supply that feeds nearby volcanoes. This is why earthquake and volcano risk overlap so closely along the belt.
A single system, many local risks
- Though it reads as one ring on a map, the belt is really dozens of independent subduction systems. A major quake in Chile has no mechanical link to one in Japan. Each stretch of the belt must be assessed on its own tectonic terms.
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