Scientists discovered the lake using over 500 seismic sensors.
Molten Carbon Lake

Royal Holloway University of London

217 miles below the Earth’s surface sits a swirling molten reservoir of carbon roughly the size of Mexico.

This underground lake was recently discovered by scientists with the use of the world’s largest collection of seismic sensors.

It formed when a Pacific tectonic plate was forced underneath a U.S. plate and it has completely changed estimates of the amounts of carbon in our planet’s mantle.

“We might not think of the deep structure of the Earth as linked to climate change above us, but this discovery not only has implications for subterranean mapping but also for our future atmosphere,” one of the study’s leaders, Dr. Sash Hier-Majumder, said in a statement. “For example, releasing only 1% of this CO2 into the atmosphere will be the equivalent of burning 2.3 trillion barrels of oil.”

To put this figure into context, we’re already struggling to deal with the 10 billion metric tons of carbon emitted in 2011. This reservoir contains 100 times as much.

If the trillions of tons of carbonate did escape from this chamber, it would cause drastic and immediate climate change across the globe.

Luckily this is unlikely, as the chemical has no pathway from the upper mantle the surface.

It’s so inaccessible, in fact, that 538 sensors were needed to measure the Earth’s vibrations and determine the size of the lake.

Still, the carbon will leak into the atmosphere eventually — but only slowly through small volcanic eruptions.

Since the reservoir sits below Yellowstone National Park, it will likely surface through the super volcano there in either an explosive eruption or a slow and subtle leak.

That volcano hasn’t erupted in 640,000 years, however, and scientists are unsure when it will blow again.

Either way, this discovery offers new clues as to how the environment we live in is connected to things happening far below our feet that are completely out of our control.


Next, read about the man who died after trying to soak in a Yellowstone hot spring. Then, check out our story on how a supervolcano may have killed off the Neanderthals.

Annie Garau
Annie is a NYC-based writer. For tips, write to [email protected]
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