Volcanoes remain active and dangerous even thousands of years after the super-eruption

Geologists studying the dormant supervolcano Toba in Indonesia's Sumatra island have found signs that

the accumulation of magma continues in its depths. This is evidenced by the slow rise of the solidified lava dome in the volcano's caldera.

Supervolcanoes are those whose eruptioncan provoke climate change on the planet. Now there are about 20 supervolcanoes known to science on Earth. Therefore, scientists are trying to understand as closely as possible the mechanisms that lead to the formation of huge volumes of molten magma under supervolcanoes. On average, eruptions occur once every 100,000 years.

Scientists have investigated the state of magma, whichremained after the super-eruption of Toba 75,000 years ago. They paid particular attention to feldspar and zircon. The isotopic composition of argon and helium in these minerals helped scientists determine the age of layers of volcanic rocks. It turned out that large eruptions occurred at intervals of about 17,000 years. However, between these events, the volcano was still active. The new study casts doubt on the generally accepted theory that supervolcanoes are harmless to humanity between major eruptions.

“Exploring when and how accumulateserupted magma, and what state the magma is in before and after such eruptions, is critical to understanding supervolcanoes. - scientists note. - We must take into account that eruptions can occur even if there is no liquid magma under the volcano. It's time to reevaluate the very concept of "eruption". "

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