NASA Confirms Thousands of Massive, Violent Volcanic “Super Eruptions” on Mars

Photo of volcanic ash taken in Hawaii on April 8, 2008. Credit: United States Geological Survey

Scientists found evidence that a region of northern Mars called Arabia Terra experienced thousands of “super eruptions,” the biggest volcanic eruptions known, over a 500-million-year period.

Some volcanoes can produce eruptions so powerful they release oceans of dust and toxic gases into the air, blocking out sunlight and changing a planet’s climate for decades. By studying the topography and mineral composition of a portion of the Arabia Terra region in northern Mars, scientists recently found evidence for thousands of such eruptions, or “super eruptions,” which are the most violent volcanic explosions known.

Spewing water vapor, carbon dioxide, and sulfur dioxide into the air, these explosions tore through the Martian surface over a 500-million-year period about 4 billion years ago. Scientists reported this estimate in a paper published in the journal Geophysical Research Letters in July 2021.

“Each one of these eruptions would have had a significant climate impact – maybe the released gas made the atmosphere thicker or blocked the Sun and made the atmosphere colder,” said Patrick Whelley, a geologist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, who led the Arabia Terra analysis. “Modelers of the Martian climate will have some work to do to try to understand the impact of the volcanoes.”

This image shows several craters in Arabia Terra that are filled with layered rock, often exposed in rounded mounds. The bright layers are roughly the same thickness, giving a stair-step appearance. The process that formed these sedimentary rocks is not yet well understood. They could have formed from sand or volcanic ash that was blown into the crater, or in water if the crater hosted a lake. The image was taken by a camera, the High Resolution Imaging Experiment, on NASA’s Mars Reconnaissance Orbiter. Credit: NASA/JPL-Caltech/University of Arizona

After blasting the equivalent of 400 million Olympic-size swimming pools of molten rock and gas through the surface and spreading a thick blanket of ash up to thousands of miles from the eruption site, a volcano of this magnitude collapses into a giant hole called a “caldera.” Calderas, which also exist on Earth, can be dozens of miles wide. Seven calderas in Arabia Terra were the first giveaways that the region may once have hosted volcanoes capable of super eruptions.

Once thought to be depressions left by asteroid impacts to the Martian surface billions of years ago, scientists first proposed in a 2013 study that these basins were volcanic calderas. They noticed that they weren’t perfectly round like craters, and they had some signs of collapse, such as very deep floors and benches of rock near the walls.

“We read that paper and were interested in following up, but instead of looking for volcanoes themselves, we looked for the ash, because you can’t hide that evidence,” Whelley said.


Credit: Madison Dean/NASA Goddard

Whelley and his colleagues got the idea to look for evidence of ash after meeting Alexandra Matiella Novak, a volcanologist at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland. Matiella Novak already had been using data from NASA’s Mars Reconnaissance Orbiter to find ash elsewhere on Mars, so she partnered with Whelley and his team to look specifically in Arabia Terra.

The team’s analysis followed up on the work of other scientists who earlier suggested that the minerals on the surface of Arabia Terra were volcanic in origin. Another research group, upon learning that the Arabia Terra basins could be calderas, had calculated where ash from possible super eruptions in that region would have settled: traveling downwind, to the east, it would thin out away from the center of the volcanoes, or in this case, what’s left of them – the calderas.

“So we picked it up at that point and said, ‘OK, well, these are minerals that are associated with altered volcanic ash, which has already been documented, so now we’re going to look at how the minerals are distributed to see if they follow the pattern we would expect to see from super eruptions,” Matiella Novak said.

NASA Goddard scientist, and Arabia Terra study lead author, Patrick Whelley, preparing for a 3D laser scan survey at the site of the 1875 explosive eruption of the Askja Volcano, Iceland, August 2, 2019. Credit: Jacob Richardson / NASA Goddard

The team used images from MRO’s Compact Reconnaissance Imaging Spectrometer for Mars to identify the minerals in the surface. Looking in the walls of canyons and craters from hundreds to thousands of miles from the calderas, where the ash would have been carried by wind, they identified volcanic minerals turned to clay by water, including montmorillonite, imogolite, and allophane. Then, using images from MRO cameras, the team made three-dimensional topographic maps of Arabia Terra. By laying the mineral data over the topographic maps of the canyons and craters analyzed, the researchers could see in the mineral-rich deposits that the layers of ash were very well preserved – instead of getting jumbled by winds and water, the ash was layered in the same way it would have been when it was fresh.

“That’s when I realized this isn’t a fluke, this is a real signal,” said Jacob Richardson, a geologist at NASA Goddard who worked with Whelley and Novak. “We’re actually seeing what was predicted and that was the most exciting moment for me.”

The same scientists who originally identified the calderas in 2013 also calculated how much material would have exploded from the volcanoes, based on the volume of each caldera. This information allowed Whelley and his colleagues to calculate the number of eruptions needed to produce the thickness of ash they found. It turned out there were thousands of eruptions, Whelley said.

One remaining question is how a planet can have only one type of volcano littering a region. On Earth volcanoes capable of super eruptions – the most recent erupted 76,000 years ago in Sumatra, Indonesia – are dispersed around the globe and exist in the same areas as other volcano types. Mars, too, has many other types of volcanoes, including the biggest volcano in the solar system, called Olympus Mons. Olympus Mons is 100 times larger by volume than Earth’s largest volcano of Mauna Loa in Hawaii, and is known as a “shield volcano,” which drains lava down a gently sloping mountain. Arabia Terra so far has the only evidence of explosive volcanoes on Mars.

It’s possible that super-eruptive volcanoes were concentrated in regions on Earth but have been eroded physically and chemically or moved around the globe as continents shifted due to plate tectonics. These types of explosive volcanoes also could exist in regions of Jupiter’s moon Io or could have been clustered on Venus. Whatever the case may be, Richardson hopes Arabia Terra will teach scientists something new about geological processes that help shape planets and moons.

“People are going to read our paper and go, ‘How? How could Mars do that? How can such a tiny planet melt enough rock to power thousands of super eruptions in one location?’” he said. “I hope these questions bring about a lot of other research.

Reference: “Stratigraphic Evidence for Early Martian Explosive Volcanism in Arabia Terra” by Patrick Whelley, Alexandra Matiella Novak, Jacob Richardson, Jacob Bleacher, Kelsey Mach, Reagan N. Smith, 16 July 2021, Geophysical Research Letters.
DOI: 10.1029/2021GL094109

GeoscienceMarsNASANASA Goddard Space Flight CenterPopularVolcano
Comments ( 13 )
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  • pat

    How trite to make the headline appear to be reporting a current/recent occurrence.

    Funny. ha.

  • Mark Minnick

    More unproveable junk science getting published, which is the whole goal in the fantasy science community. Interesting to read, but no more provable than stuff in a a “space opera”. Present this crap as theory not fact!

    • Torbjörn Larsson

      ? They did observe what their hypotheses told them to expect.

      Your conspiracy theory on science however is devoid of fact.

  • Doctor Doom

    Oddly, I didn’t think for a moment that it was current. I’m pretty sure that Mars has been pretty much geologically moribund for quite a while.

    But hey, at least you got to check off “Use the word TRITE in an internet comment”, right? Lol.

  • Tony Smith

    Misleading information.This article should have said evidence of ‘former’ volcanic activity on mars. We have yet to discover current geological activity on mars, if it ever existed.

  • Wil

    I am not surprised by this, given that we already see evidence of past tectonic activity on Mars. I hypothesize that after the cessation of tectonics, supervolcanoes became the main form of energy dissipation. Were tectonics to cease on Earth, the same will likely occur.

  • That B Train

    This what happen when I pop pimples

  • MG

    Mark Minnick, Maybe if you paid for a subscription to a news outlet that provides better coverage but it won’t be like the old days before the internet!

  • Pari

    Mars needs guitars 🤪

  • Craig

    You lot need a check up from the neck up. Why post this rubbish. It is obvious non of you can be taken seriously.

  • Cincinnatus

    Re the concentration of super volcanoes on 1 region only, at a guess, devolves from the same reason Olympus Mons is so very large.
    No techtonic plates. So the pent up pressures of liquid cores have no obvious escape Avenue, when one finally does open up, most of the pressure will erupt down that one escape valve. Olympus Mons is one example, this field of super volcanoes another.

    My 2 cents.

    • Torbjörn Larsson

      “A superswell is a large area of anomalously high topography and shallow ocean regions. These areas of anomalous topography are byproducts of large upwelling of mantle material from the core–mantle boundary, referred to as superplumes.[1] Two present day superswells have been identified: the African superswell and the South Pacific superswell. In addition to these, the Darwin Rise in the south central Pacific Ocean is thought to be a paleosuperswell, showing evidence of being uplifted compared to surrounding ancient ocean topography.[2]”

      [ https://en.wikipedia.org/wiki/Superswell ]