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Hawaii volcanoes: Invisible heatwave under Pacific amplified island formation
๐Ÿ‡ฌ๐Ÿ‡ท Greece /Disasters & Emergencies

Hawaii volcanoes: Invisible heatwave under Pacific amplified island formation

From Ta Nea · () Greek

Translated from Greek, summarized and contextualized by DistantNews.

At a glance

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  • Scientists discovered that the Earth's mantle beneath Hawaii is heating up, challenging traditional geological theories about volcano formation.
  • New data reveals two distinct heatwaves may explain why some Hawaiian volcanoes grew exceptionally large.
  • This finding contradicts the long-held view that hotspots cool over time, suggesting they are instead warming.

Volcanoes in Hawaii have long fascinated scientists, serving as natural laboratories for understanding geological processes. However, a recent discovery is reshaping our understanding of their formation. New data indicates that the Earth's mantle beneath the region is surprisingly hot, challenging established geological theories.

The mystery of dual eruptions from the same volcano may be explained by rising mantle temperatures and two distinct heatwaves. These phenomena could account for the exceptional size of certain Hawaiian volcanoes. A remarkable 3,500-kilometer-long volcanic trail marks the Pacific tectonic plate's slow passage over the Hawaiian hotspot.

Contrary to previous scientific beliefs, the mantle plume beneath this island chain does not appear to be cooling. Instead, it has warmed by approximately 250ยฐC over the last 47 million years. Research published in Earth and Planetary Science Letters links two periods of unusually high temperatures to the formation of the largest volcanoes in the Hawaiian Islands.

It was a big surprise to find such a strong, direct correlation between mantle temperatures and volcano size.

โ€” Michael GarciaMichael Garcia, a geosciences professor at the University of Hawaii at Mฤnoa, expressed surprise at the strong link found between mantle temperatures and volcano size.

Scientists studied olivine basalt samples from 16 volcanoes, investigating four potential explanations for variations in lava volume: lithosphere thickness, magma source differences, Pacific plate speed changes, and mantle plume temperature shifts. "The finding of such a strong, direct correlation between mantle temperatures and volcano size was a big surprise," said Michael Garcia, a geosciences professor at the University of Hawaii at Mฤnoa. "Other potential explanations simply failed to explain the data."

To reconstruct temperatures deep beneath the volcanoes, researchers developed a new "geothermometer" to estimate the heat of the lava when it originally formed in the mantle. This new approach is expected to provide deeper insights into the dynamic processes driving volcanic activity.

Other potential explanations simply failed to explain the data.

โ€” Michael GarciaMichael Garcia stated that alternative theories could not account for the observed data regarding volcano formation.
DistantNews Editorial

Originally published by Ta Nea in Greek. Translated, summarized, and contextualized by our editorial team with added local perspective. Read our editorial standards.

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