Yellowstone volcano plume bigger than previous estimates

University of Utah geophysicists made the first large-scale picture of the electrical conductivity of the gigantic underground plume of hot and partly molten rock that feeds the Yellowstone supervolcano. The image suggests the plume is even bigger than it appears in earlier images made with earthquake waves.

“It’s like comparing ultrasound and MRI in the human body; they are different imaging technologies,” says geophysics Professor Michael Zhdanov, principal author of the new study and an expert on measuring magnetic and electrical fields on Earth’s surface to find oil, gas, minerals and geologic structures underground.

“It’s a totally new and different way of imaging and looking at the volcanic roots of Yellowstone,” says study co-author Robert B. Smith, professor emeritus and research professor of geophysics and a coordinating scientist of the Yellowstone Volcano Observatory.

The new University of Utah study has been accepted for publication in Geophysical Research Letters, which plans to publish it within the next few weeks.

In a December 2009 study, Smith used seismic waves from earthquakes to make the most detailed seismic images yet of the “hotspot” plumbing that feeds the Yellowstone volcano. Seismic waves move faster through cold rock and slower through hot rock. Measurements of seismic-wave speeds were used to make a three-dimensional picture, quite like X-rays are combined to make a medical CT scan.

The 2009 images showed the plume of hot and molten rock dips downward from Yellowstone at an angle of 60 degrees and extends 150 miles west-northwest to a point at least 410 miles under the Montana-Idaho border – as far as seismic imaging could “see.”

In the new study, images of the Yellowstone plume’s electrical conductivity – generated by molten silicate rocks and hot briny water mixed in partly molten rock – shows the conductive part of the plume dipping more gently, at an angle of perhaps 40 degrees to the west, and extending perhaps 400 miles from east to west. The geoelectric image can “see” only 200 miles deep.

Two Views of the Yellowstone Volcanic Plume

Smith says the geoelectric and seismic images of the Yellowstone plume look somewhat different because “we are imaging slightly different things.” Seismic images highlight materials such as molten or partly molten rock that slow seismic waves, while the geoelectric image is sensitive to briny fluids that conduct electricity.

“It [the plume] is very conductive compared with the rock around it,” Zhdanov says. “It’s close to seawater in conductivity.”

The lesser tilt of the geoelectric plume image raises the possibility that the seismically imaged plume, shaped somewhat like a tilted tornado, may be enveloped by a broader, underground sheath of partly molten rock and liquids, Zhdanov and Smith say.

“It’s a bigger size” in the geoelectric picture, says Smith. “We can infer there are more fluids” than shown by seismic images.

Despite differences, he says, “this body that conducts electricity is in about the same location with similar geometry as the seismically imaged Yellowstone plume.”

Zhdanov says that last year, other researchers presented preliminary findings at a meeting comparing electrical and seismic features under the Yellowstone area, but only to shallow depths and over a smaller area.

The study was conducted by Zhdanov, Smith, two members of Zhdanov’s lab – research geophysicist Alexander Gribenko and geophysics Ph.D. student Marie Green – and computer scientist Martin Cuma of the University of Utah’s Center for High Performance Computing. Funding came from the National Science Foundation (NSF) and the Consortium for Electromagnetic Modeling and Inversion, which Zhdanov heads.

The Yellowstone Hotspot at a Glance

The new study says nothing about the chances of another cataclysmic caldera (giant crater) eruption at Yellowstone, which has produced three such catastrophes in the past 2 million years.

Almost 17 million years ago, the plume of hot and partly molten rock known as the Yellowstone hotspot first erupted near what is now the Oregon-Idaho-Nevada border. As North America drifted slowly southwest over the hotspot, there were more than 140 gargantuan caldera eruptions – the largest kind of eruption known on Earth – along a northeast-trending path that is now Idaho’s Snake River Plain.

The hotspot finally reached Yellowstone about 2 million years ago, yielding three huge caldera eruptions about 2 million, 1.3 million and 642,000 years ago. Two of the eruptions blanketed half of North America with volcanic ash, producing 2,500 times and 1,000 times more ash, respectively, than the 1980 eruption of Mount St. Helens in Washington state. Smaller eruptions occurred at Yellowstone in between the big blasts and as recently as 70,000 years ago.

Seismic and ground-deformation studies previously showed the top of the rising volcanic plume flattens out like a 300-mile-wide pancake 50 miles beneath Yellowstone. There, giant blobs of hot and partly molten rock break off the top of the plume and slowly rise to feed the magma chamber – a spongy, banana-shaped body of molten and partly molten rock located about 4 miles to 10 miles beneath the ground at Yellowstone.

Computing a Geoelectrical Image of Yellowstone’s Hotspot Plume

Zhdanov and colleagues used data collected by EarthScope, an NSF-funded effort to collect seismic, magnetotelluric and geodetic (ground deformation) data to study the structure and evolution of North America. Using the data to image the Yellowstone plume was a computing challenge because so much data was involved.

Inversion is a formal mathematical method used to “extract information about the deep geological structures of the Earth from the magnetic and electrical fields recorded on the ground surface,” Zhdanov says. Inversion also is used to convert measurements of seismic waves at the surface into underground images.

Magnetotelluric measurements record very low frequencies of electromagnetic radiation – about 0.0001 to 0.0664 Hertz – far below the frequencies of radio or TV signals or even electric power lines. This low-frequency, long-wavelength electromagnetic field penetrates a couple hundred miles into the Earth. By comparison, TV and radio waves penetrate only a fraction of an inch.

The EarthScope data were collected by 115 stations in Wyoming, Montana and Idaho – the three states straddled by Yellowstone National Park. The stations, which include electric and magnetic field sensors, are operated by Oregon State University for the Incorporated Research Institutions for Seismology, a consortium of universities.

In a supercomputer, a simulation predicts expected electric and magnetic measurements at the surface based on known underground structures. That allows the real surface measurements to be “inverted” to make an image of underground structure.

Zhdanov says it took about 18 hours of supercomputer time to do all the calculations needed to produce the geoelectric plume picture. The supercomputer was the Ember cluster at the University of Utah’s Center for High Performance Computing, says Cuma, the computer scientist.

Ember has 260 nodes, each with 12 CPU (central processing unit) cores, compared with two to four cores commonly found on personal computer, Cuma says. Of the 260 nodes, 64 were used for the Yellowstone study, which he adds is “roughly equivalent to 200 common PCs.”

To create the geoelectric image of Yellowstone’s plume required 2 million pixels, or picture elements.

University of Utah Public Relations
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Salt Lake City, Utah 84112-9017
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9 COMMENTS

  1. p.s. continue in revelation and you’ll see meterorites mentioned figureatively. we don’t see them much today but we do see them. The tribulation period there will be many and even the stars fell to the earth.

  2. but i also come to my conclusion in my spirit that when God is saying CAST INTO THE SEA, that it is a meterorite. As soon as i read this some 20 yrs ago i felt it and i still believe it to be today. don’t get caught up on words like SUPER HEATED, and the science talk.

    a meterorite can deliever far more damage than the largest volcanoe on earth. the problem is we might get caught up in the science we see, rather than what is God might be telling us in his word. We don’t see meterorites falling to earth every day so we look at what we see even though you can’t see that super heated magma chamber under yellowstone….lol….

    God’s word was in the beginning and is spiritually inspired by holy men of God moved by the Holy spirit :) It pierces through bone and marrow. Anyway, It’s spirtitual descerned by a mature christian. we all grow in sanctification but we need to meditate when we read God’s word. Besides you didn’t answer my first question anyway so your not listening. 1/3rd of the earth is not the united states.

    look at the global map. there is your 1/3 over in the middle east. However i have no doubt that in the tribulation period that yellowstone will most likely go off because of the sin on the earth. The bible says in Romans 8 22 that the whole earth groans and travails waiting to be delievered by Jesus at his coming.

    it will be like Japan all over the world. nobody escapes God’s wrath in the great tribulation. nations are surrounding Israel, the US is sinking like the titanic and has gone beyond the point of return. the state is set for the rapture that wasn’;t set years age. I believe the ring of fire is coming alive because of the sin that God cannot wink at anymore. Heck, yellowstone could go off before that time.

  3. Your statement ” it looks just like what Revelation says.” lol…if your a scientist and not yet a believing Christian, then it’s OK :) We could get through this. But it sounds as though you might be a professing Christian. If so, then let me kindly suggest you write to prophecy experts. email them your question and see what they tell you. I rather talk about these things to unbelievers.

    oh….why can’t it look like a meteror? lol…

  4. Christine & Danny, It is great to be amoung true belivers in this day and age!! See you both at His table very soon.

  5. The scenario of a volcanic eruption occuring on the North American continent is not only possible – it is Biblical. The prophecy mentioned in Revelation with the blowing of the first couple trumpets signals the erupting of a major volcano which as a result, a third of the earth is burned up, including a third of trees and green grass. If you do the process of elimination, the only part of the earth that could be affected by this disaster – would be the North American region.

    • leave it to a woman, they know best!

      Your interpretation is scewed. Where did you hear this from? what makes you think 1 third of the earth is none other than the US? There are volcanos all over the world and what God says in revelation with the first trumpet doesn’t even speak of volcanos.

      “we are to study to show ourselves approved” The first trumpet will be literal and weill be a fulfillment of the prophecy of Joel in Joel 2:30-32. this is similar to the seventy plague upon Egypt in Ex 9:22

      and the third part of trees was burnt up, and all green grass was burnt up. this probably refers to a thir part of the Mediterranean area being affected; even though all of this will affect the entirety of the Earth as would be obvious, the greatest concentration will be in the middle east. yes Yellowstone is there and we’re all aware of the fact that it is there but i wouldn’t be so quick to say it’s the volcano mentioned in the 1st and or 2nd trumpet in revelation. Have you ever heard of a Meteorite? It says that hail and fire FELL to the earth.

      vs 8 “AS it were a great mountain burning with fire was CAST INTO THE SEA. no volanoe can destroy 1 third of the sea and or earth. Only a medeorite could do this kind of damage and it will be a great meteorite.

      these are all signs in the heavens being fullfilled.

      • Danny: Let’s look into more detail and the possibility of a volcano versus an meteor with the first trumpet. Fire and hail mixed with blood. John never seen a volcano in his lifetime – why can’t this be a description of one? Watch a video of an eruption – it looks just like what Revelation says. The second trumpet. Something like a huge mountain – why can’t this be the top of a mountain blown off from a super heated volcano? This as a result may also be the reason why a third of the ships are destroyed in the third trumpet. Oh, just because I am a woman… I don’t have better instincts than you? Oh, that’s right! God did make me better in that department than a man! Lol!

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