A Volcano Stopped an Earthquake?

Mount Aso, one of the most active volcanoes in Japan, recently helped to stop a powerful earthquake before it subsided on its own, researchers discovered.

When a 7.1-magnitude quake struck Kumamoto, Japan, on April 16, 2016, it opened surface ruptures in a zone extending 25 miles (40 kilometers) in length. But scientists found evidence suggesting that the powerful earthquake was halted by a magma chamber under the Aso volcanic cluster, located 19 miles (30 km) from where the quake originated.

This finding provided scientists with a rare glimpse of how two geological phenomena — volcanoes and earthquakes — may interact. This topic is of particular interest in Japan, which is particularly vulnerable to both volcanoes and earthquakes. [The 11 Biggest Volcanic Eruptions in History (Photos)]

An earthquake is a sudden release of pent-up energy in Earth's crust that has accumulated over time, generated by shifting tectonic plates. When two sides of a fault, or crack along a plate boundary, move apart or slide suddenly past each other, energy gets released. The waves of energy radiate outward from that jolt, often producing shaking on Earth's surface, according to the U.S. Geological Survey (USGS).

Japan is especially prone to earthquakes, as it lies in the Pacific Ring of Fire, a U-shaped area in the Pacific Ocean where several tectonic plates meet, and where many earthquakes are generated.

A number of volcanoes are also found in this Ring of Fire. And it was the particular interaction of the April 2016 earthquake with the Mount Aso volcano that triggered the researchers' interest in how seismic activity could be affected by the structure of volcanic clusters.
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