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Tag: Beneath

  • The science of the “X-ray vision” that reveals the magma beneath Yellowstone


    Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week’s contribution is from Scott K. Johnson, Science Communication Associate at EarthScope Consortium.

    Jeopardy is unique for its question-to-the-answer format, with contestants using a clue like “this animal starred in a 1975 Steven Spielberger film and can constantly regrow lost teeth” to correctly respond “what is a shark?” The geophysical techniques that allow us to image the magma beneath Yellowstone―as in a recent study that provided a view of multiple separate magma reservoirs― work similarly. These studies are often of great public interest, producing visuals that are (relatively) easy to understand. But how exactly do they work?

    This example shows areas where seismic waves travel more quickly in blue, and slower areas in red, beneath the western United States. Faults are black lines, and blue line is the San Andreas Fault. You can explore the data at any depth beneath the surface with EarthScope’s velocity model viewer (https://observablehq.com/@earthscope/emc-horizontal-slicer).  

    Seeing below the surface is the realm of tomography―in medical imaging, the “CT” in “CT scan” stands for Computed Tomography―which can be done in several ways. The most common method uses shaking measured by seismometers to reveal variations in the physical properties of the Earth.

    The similarity to Jeopardy is that these techniques work backwards―what we call “inversion.” Because we can’t directly take a measuring tape underground and inspect a magma reservoir, we have to rely on the fact that this magma reservoir can affect measurements of other things, like seismic waves that pass through. If we knew exactly what was underground, we could pretty clearly predict its effect on the seismic waves reaching nearby seismometers. But instead, the inverse solution is to take the pattern of measured seismic waves and work backwards to find a plausible model of the conditions underground that would cause that pattern.

    It’s a bit like working out where a traffic jam is occurring in town based solely on how late each of your coworkers arrives home at the end of the workday. Knowing that they all left work at 5:15, and knowing which part of town each one was headed for, you could probably figure out where the slowdown is based on the fact that two people were delayed 15 minutes, one was delayed 5 minutes, and one experienced no delay at all.

    In fact, a common method of seismic tomography involves measuring the travel time for seismic waves from earthquakes and noting where they arrive at seismometers “late.” This allows us to map out regions of rock where seismic waves travel more quickly or more slowly. That information can then be turned into estimates of physical properties like temperature, rock type, density, or the presence (and amount) of magma. The more seismometers recording data and the more earthquakes that are measured, the better the resolution of the map.

    The same idea can be applied in other ways to seismic data. We can look at the details of the wiggles on the seismometer rather than just their arrival time, for example, seeing which areas of the Earth dampen the seismic waves and which ring like a bell. Or we can replace the earthquake with another source of shaking energy, like a truck-mounted piston that thumps the ground, the constant background din of a busy highway, or even the global noise created by ocean waves. Through different approaches, we can image something local, like a magma reservoir, or we can image the entire planet―this is how we know about the properties of the mantle, outer core, and inner core of the Earth.

    Schematic showing magma storage beneath Yellowstone caldera. Nested calderas resulting from the Huckleberry Ridge Tuff, Mesa Falls Tuff, and Lava Creek Tuff caldera forming eruptions are shown as solid black, green, and orange lines, respectively. C1 and C2 represent bodies of basaltic magma and C3 and C5-C7 represent rhyolitic magma bodies beneath Yellowstone caldera. Magnetotelluric stations occupied during experiment are shown as magenta triangles. Sour Creek and Mallard Lake resurgent domes are shown as purple lines. The locations of Lower Geyser Basin (LGB), Norris Geyser Basin (NGB), and Hot Springs Basin (HSB) are shown. Figure is from Bennington et al., “The progression of basaltic–rhyolitic melt storage at Yellowstone Caldera.” Nature 637:8044 (2025), 97-102.

    The recent image of Yellowstone’s magma system was created from yet another kind of data. Instead of using seismometers that measure shaking, magnetotelluric instruments were used to measure the electrical conductivity beneath the ground.

    The Sun’s energy and also lightning around the world induce electrical and magnetic fields within the Earth, but the strength of these fields varies from place to place depending on the conductivity of the material beneath the surface. And since measurements at different frequencies relate to the conductivity at different depths, we can collect quite a lot of information through magnetotelluric measurements. Magma has a much higher conductivity than solid rock, so the magnetotelluric technique is of obvious use around volcanoes.

    The inversion in the case of magnetotelluric data works out the 3-D pattern of conductivity underground that can explain the measurements made at the surface. And again, the more surface measurements you have close together, the more detailed the 3-D image becomes.

    All kinds of tomography have been employed at Yellowstone to give us a much richer understanding of the magma system that lies beneath the ground. Similar studies have been done at other volcanoes as well—like Mount St. Helens. Even on a much smaller scale, these techniques have been used to image the hot-water “plumbing” beneath individual geysers in Yellowstone, giving us insights into the reasons for their behavior.

    Permanent monitoring networks of instruments like seismometers around Yellowstone help make this possible―sometimes supplemented by temporary additions of even more instruments for higher-resolution imaging. The end result is a better understanding of what the system looks like beneath the surface, how it works, and how it may behave over time, which is critical to the mission of keeping people out of harm’s way―out of jeopardy, you might say.



    Yellowstone National Park is home to one of the most powerful and active volcanic systems in the world. Beneath the surface lies a massive reservoir of magma that fuels the park’s famous geysers and hot springs. But how do scientists know what lies beneath the surface? The answer lies in the science of “X-ray vision.”

    Using a technique known as seismic tomography, scientists are able to create detailed images of the subsurface by analyzing the way seismic waves travel through the Earth. Just like how X-rays can reveal the bones inside our bodies, seismic waves can reveal the magma chambers and pathways beneath Yellowstone.

    By placing seismometers around the park and monitoring the vibrations created by earthquakes and other sources, scientists are able to map out the structure of the Earth’s crust and mantle in incredible detail. This allows them to pinpoint the location and size of magma chambers, as well as the pathways that magma takes as it rises to the surface.

    This “X-ray vision” has revolutionized our understanding of Yellowstone’s volcanic system, helping scientists to better predict when and where eruptions may occur. By studying the complex network of magma beneath the park, researchers are able to gain valuable insights into the inner workings of one of the world’s most fascinating geological hotspots.

    So the next time you visit Yellowstone National Park, remember that beneath your feet lies a world of fiery molten rock, just waiting to be revealed by the science of “X-ray vision.”

    Tags:

    Yellowstone magma, X-ray vision, geology, volcanic activity, scientific discovery, seismic imaging, underground exploration, geological insights, volcanic hotspots, magma chambers, Yellowstone National Park, subterranean research, geophysical imaging

    #science #Xray #vision #reveals #magma #beneath #Yellowstone

  • Beneath Trump’s Chaotic Spending Freeze: An Idea That Crosses Party Lines


    When President Trump said on Wednesday that his order to freeze federal spending was about “scams, dishonesty, waste and abuse,” he was echoing promises made by his predecessors in both parties.

    Yes, the memo was a sweeping attempt to remake what he calls a “woke” government in his image. Yes, it was part of his retribution agenda to purge the “deep state” of his perceived enemies. And yes, it was an assertion of presidential power that threatened to undermine a core congressional authority — the power to direct federal spending.

    But beneath all that, it was also one of the most far-reaching attempts to somehow reverse the seemingly inexorable growth of the federal government, an issue that resonates with some Democrats as well as most Republicans.

    Mr. Trump’s order was blocked by a federal judge, but the chaos and confusion it caused may make it even harder to achieve his desired goal. Democrats now appear energized to oppose any effort by the president to slash programs, and government unions have issued new statements vowing to protect their workers from cuts. Organizations that receive federal money are now worried and wary.

    But there is no indication that Mr. Trump is likely to give up. In a social media post on Wednesday, Karoline Leavitt, the White House press secretary, referred to a series of executive orders signed by Mr. Trump, saying that “the President’s EO’s on federal funding remain in full force and effect, and will be rigorously implemented.”

    If that is the case, Mr. Trump will be continuing a mostly-failed effort by a long series of presidents and Congress. As measured by the numbers of people it employs, the federal bureaucracy increased by about 12 percent between 1984 (when Ronald Reagan was president) and 2020 (near the end of Mr. Trump’s first term), according to data compiled by the Brookings Institution. During that period, the population of the United States grew faster, by around 45 percent.

    The amount of money the government spends has skyrocketed under Democratic and Republican presidents. Total federal spending in 2015 was $4.89 trillion, according to federal data. In 2024, it was $6.75 trillion. Even when accounting for the growth of the overall economy, spending as a percentage of gross domestic product was higher in 2024 than it was eight years earlier.

    In that same period, the national debt — the total amount that the government has borrowed — grew to $35.4 trillion from $18.1 trillion.

    Maya MacGuineas, the president of the bipartisan Committee for a Responsible Federal Budget, said Mr. Trump’s memo appeared to be designed less to shrink government and more to “eliminate programs at odds with the Administration’s social and cultural values.” But she said that does not mean the underlying idea was a mistake.

    “A similar exercise, however (minus the chaotic release, and including an assessment before changes were made rather than the other way around) would be immensely useful in controlling spending if the focus were on evaluating efficiency and effectiveness,” she said. “A granular exercise like this is desperately needed in as many tax expenditure and spending programs as possible.”

    There is a long history of attempts to rein in spending and address concerns that the government is bloated and inefficient.

    Vice President Al Gore created and led the National Partnership for Reinventing Government in 1993 in the hopes of making government more efficient, more cost-effective and, ultimately, smaller. Over a number of years, hundreds of government agencies were either eliminated or consolidated, but the effort did little to change the overall direction of the government’s growth.

    President George W. Bush, like many Republicans of his day, championed a smaller federal government during his term, but oversaw a period when the government grew under his eight-year watch. In a State of the Union address at the beginning of his second term, President Barack Obama said “it’s not a bigger government we need, but a smarter government.” He, too, presided over a government that expanded.

    In part, experts say, that is because despite being a bipartisan goal, the Republican and Democratic parties have grown increasingly more divided about which parts of the government to keep and which to cut.

    Democrats have tended to favor social programs, such as education, child welfare, health care, the environment and diplomacy. Republicans — and more recently Mr. Trump’s MAGA movement — have been focused on the border, police and building a larger military. Areas of agreement, or at least compromise, have become more and more rare.

    For his part, Mr. Trump has always talked a big game about wanting to disrupt what he calls “the establishment” in part by waging war against the federal bureaucracy.

    In his first inaugural address, Mr. Trump hinted at his disdain of the federal government that he had been elected to lead, saying that “we are transferring power from Washington, D.C., and giving it back to you, the American people.”

    “Washington flourished, but the people did not share in its wealth,” he added.

    By his second inaugural address this month, it was clear that the president’s animosity toward the federal government and its employees had only deepened.

    “Our country can no longer deliver basic services in times of emergency,” he asserted, saying that since he departed the White House four years ago, “we now have a government that cannot manage even a simple crisis at home while, at the same time, stumbling into a continuing catalog of catastrophic events abroad.”

    Mr. Trump promised he would “restore competence and effectiveness to our federal government.”

    But as president the first time, Mr. Trump was often reminded how difficult it can be to alter the arc of the government. Not counting the military and contractors, the size of the civilian federal work force grew from about 1.85 million employees to about 1.94 million employees. That came about in part because the government hired workers for efforts toward the president’s goals on border security, trade and support for veterans, according to a recent analysis.

    The president’s efforts to slash the government this week have been more direct and more blunt. The funding freeze memo was meant to identify large parts of the federal bureaucracy to eliminate if the work clashed with Mr. Trump’s conservative social and cultural views.

    A second order, which remains in force for now, offers an early retirement option for employees who don’t want to return to the office after working from home since the Covid pandemic. The administration has estimated that as many as 10 percent of the federal work force might accept the offer. But if even half of that number do, it would be a dramatic reduction in the number of government workers.

    Still, Ms. MacGuineas said that even those kinds of cuts would not be enough to confront the nation’s burgeoning debt from spending too much over many decades.

    To make a real impact on the debt, she said, “we are going to have to look at the big areas of the budget for savings — Social Security, health care, and revenues — the very same areas both political parties are tripping over themselves not to address.”



    In the midst of President Trump’s recent announcement of a spending freeze, there lies an idea that has the potential to bring both Democrats and Republicans together in a rare show of bipartisanship.

    The idea revolves around the concept of fiscal responsibility and ensuring that taxpayer dollars are spent wisely and efficiently. While the specifics of the spending freeze may be contentious, the underlying principle of curbing unnecessary government spending is one that both sides of the political spectrum can agree on.

    In a time of heightened political polarization, finding common ground on issues like government spending can be a refreshing change. By focusing on areas where there is agreement, rather than constantly bickering over divisive issues, politicians can work together to create policies that benefit all Americans.

    As the debate over the spending freeze continues, let’s not lose sight of the bigger picture: the need for responsible stewardship of taxpayer dollars. This is an idea that transcends party lines and has the potential to bring our country together in pursuit of a common goal.

    Tags:

    1. Trump spending freeze
    2. Bipartisan idea
    3. Political party lines
    4. Government spending
    5. Fiscal policy
    6. Trump administration
    7. Economic impact
    8. Cross-party cooperation
    9. Budget management
    10. Policy analysis

    #Beneath #Trumps #Chaotic #Spending #Freeze #Idea #Crosses #Party #Lines

  • Volcanic Activity Beneath Yellowstone’s Massive Caldera Could Be on The Move : ScienceAlert

    Volcanic Activity Beneath Yellowstone’s Massive Caldera Could Be on The Move : ScienceAlert


    Volcanic activity bubbling away beneath the Yellowstone National Park in the US appears to be on the move.

    New research shows that the reservoirs of magma that fuel the supervolcano‘s wild outbursts seem to be shifting to the northeast of the Yellowstone Caldera. This region could be the new locus of future volcanic activity, according to a team led by seismologist Ninfa Bennington of the US Geological Survey.


    “On the basis of the volume of rhyolitic melt storage beneath northeast Yellowstone Caldera, and the region’s direct connection to a lower-crustal heat source, we suggest that the locus of future rhyolitic volcanism has shifted to northeast Yellowstone Caldera,” they write in their paper.


    “In contrast, post-caldera rhyolitic volcanism in the previous 160,000 years has occurred across the majority of Yellowstone Caldera with the exclusion of this northeast region.”


    Yellowstone is one of the world’s largest supervolcanoes; a vast, complex, dynamic region of Earth’s crust that is both spectacularly beautiful and deeply dangerous.


    In the past 2 million years, Yellowstone has undergone three huge, caldera-forming eruptions – those that create the cauldron-like basins on Earth’s surface when a subterranean magma chamber empties and collapses in on the hollowed-out cavity. These huge eruptions have been interspersed with smaller eruptions.

    Yellowstone's Volcanic Activity Appears to Be Migrating Northeast
    A diagram of the theorized formation of the Yellowstone Caldera. (National Park Service)

    The caldera-forming eruptions at Yellowstone are sourced from reservoirs of rhyolitic melt. That’s silica-rich magma, the volcanic equivalent of granite, sticky and viscous and slow-moving, and thought to be stored in vast volumes underneath the Yellowstone region.


    Previous studies presumed the rhyolitic reservoirs were supported by deeper reservoirs of basaltic magma – molten material that has a much smaller silica content than rhyolite, but abundant iron and magnesium. It’s also significantly less viscous than rhyolite, but also denser, and the way it conducts electricity differs to rhyolite.


    This latter difference in properties gave Bennington and her colleagues the tools they needed to probe the magmatic reservoir contents beneath the Yellowstone Plateau.


    One way to monitor activity beneath Earth’s surface involves measuring surface variations in the planet’s magnetic and electric fields. This is known as magnetotellurics, and it’s particularly sensitive to the presence of subsurface melts.


    Bennington and her colleagues carried out a wide-scale magnetotelluric survey across the Yellowstone Caldera, and used the resulting data to model the distribution of the melt reservoirs lurking therein.


    Their results revealed that there are at least seven distinct regions of high magma content, some of which are feeding into others, at depths between 4 and 47 kilometers (2.5 to 30 miles) beneath the ground – down to the boundary of the crust and mantle.

    Yellowstone's Volcanic Activity Appears to Be Migrating Northeast
    A map of the reservoirs under Yellowstone. Yellow represents basalt, red rhyolite, and orange basalt-to-rhyolite transition zones. The purple triangles are the magnetotelluric monitoring stations. (Bennington et al., Nature, 2025)

    The most interesting melt storage was in the northeast. There, huge reservoirs of basaltic magma in the lower crust heat and maintain chambers of rhyolitic magma in the upper crust. These chambers of rhyolitic magma contain an estimated melt storage volume of around 388 to 489 cubic kilometers – almost an order of magnitude higher than melt storage zones to the south, west, and north, where previous eruptions took place.


    This volume, the researchers note, is also comparable to the melt volume of previous caldera-forming eruptions in Yellowstone.


    The rhyolitic caldera-forming eruptions, the researchers note, were interspersed with smaller, basaltic eruptions within the caldera. However, it’s unclear exactly how these kinds of eruptions work. The team’s research suggests that the rhyolitic magma chambers have to cool completely before the basaltic magma can move in.


    Exactly when and how these future eruptions are going to take place will, the researchers say, require further analysis.

    The research has been published in Nature.



    Volcanic Activity Beneath Yellowstone’s Massive Caldera Could Be on The Move : ScienceAlert

    Recent research has suggested that the volcanic activity beneath Yellowstone National Park’s massive caldera may be shifting, potentially indicating an increase in volcanic activity. Scientists have long been monitoring the supervolcano, which last erupted over 640,000 years ago, to better understand its behavior and potential risks.

    In a new study published in the journal Geophysical Research Letters, researchers analyzed data collected from a network of seismometers in the park and found evidence of volcanic activity moving beneath the caldera. This movement could indicate that magma is on the move, potentially leading to a future eruption.

    While the chances of a catastrophic eruption at Yellowstone are still considered low, scientists continue to monitor the supervolcano closely to better understand its behavior and potential risks. Understanding the movement of magma beneath the caldera is crucial for predicting and preparing for any potential volcanic activity in the future.

    Stay tuned for more updates on Yellowstone’s supervolcano and the latest research on volcanic activity in the region.

    Tags:

    1. Yellowstone Caldera
    2. Volcanic Activity
    3. Geothermal Activity
    4. Supervolcano
    5. Yellowstone National Park
    6. Seismic Activity
    7. Geology
    8. Scientific Research
    9. Earthquake Swarm
    10. Volcanic Eruptions

    #Volcanic #Activity #Beneath #Yellowstones #Massive #Caldera #Move #ScienceAlert

  • City Beneath Her Feet 1A Stock Image

    City Beneath Her Feet 1A Stock Image



    City Beneath Her Feet 1A Stock Image

    Price : 9.19

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    City Beneath Her Feet: A Stock Image

    Looking down from above, a woman stands tall on a rooftop with the bustling city below her. The skyline stretches out in all directions, with skyscrapers reaching for the sky and cars weaving through the streets below. The woman’s pose exudes confidence and power, as if she is the queen of this urban jungle. The city is hers to conquer, and she stands ready to take on whatever challenges lie ahead. This striking stock image captures the essence of modern city living, where the possibilities are endless and the world is at your feet.
    #City #Beneath #Feet #Stock #Image

  • The Serpent Beneath (The Horus Heresy Series)

    The Serpent Beneath (The Horus Heresy Series)


    Price: $9.99
    (as of Dec 14,2024 05:08:31 UTC – Details)




    ASIN ‏ : ‎ B01N6H5GWZ
    Publisher ‏ : ‎ Black Library (November 15, 2016)
    Publication date ‏ : ‎ November 15, 2016
    Language ‏ : ‎ English
    File size ‏ : ‎ 976 KB
    Text-to-Speech ‏ : ‎ Enabled
    Screen Reader ‏ : ‎ Supported
    Enhanced typesetting ‏ : ‎ Enabled
    X-Ray ‏ : ‎ Not Enabled
    Word Wise ‏ : ‎ Enabled
    Print length ‏ : ‎ 101 pages


    In the latest installment of The Horus Heresy series, readers are thrust into the heart of the galaxy-spanning conflict as the serpent beneath begins to reveal its true nature. As the traitorous Warmaster Horus continues his insidious campaign to overthrow the Emperor, a dark and malevolent force lurks in the shadows, manipulating events with sinister intent.

    As the loyalist forces fight desperately to hold back the tide of treachery, they must confront not only the physical threats arrayed against them, but also the insidious machinations of the serpent beneath. With betrayal and deception lurking around every corner, can the loyalists uncover the true nature of their enemy before it is too late?

    Join us for this thrilling new chapter in The Horus Heresy series, as the serpent beneath begins to strike, and the galaxy hangs in the balance. Will the loyalists be able to uncover the truth in time, or will they fall victim to the darkness that lurks within their midst? Don’t miss out on this epic tale of war, betrayal, and redemption.
    #Serpent #Beneath #Horus #Heresy #Series

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