Yellowstone Magma Source Closer Than Thought

New research indicates that the Yellowstone supervolcano's magma source is significantly closer to the surface than previously understood. Scientists now believe the volcano is fueled by a layer of 'magma mush' situated just below the Earth's crust, rather than a deep magma chamber. This finding suggests that tectonic forces, which stretch and tear the Earth's outer shell, are sufficient to supply magma to the volcano's chambers. Previously, it was thought that narrow columns of molten rock, or 'magma plumes,' rising from deep within the Earth were necessary. The absence of such plumes beneath major supervolcanoes like Yellowstone prompted this re-evaluation. The 'magma mush' system forms as molten rock seeps up from the asthenosphere and interacts with the overlying solid rock. Tectonic activity further aids this process by creating channels for magma to rise. This new understanding is vital for evaluating the hazards posed by Yellowstone and other similar volcanic systems globally. Although the US Geological Survey estimates a potential eruption is at least 100,000 years away, recent seismic monitoring between 2008 and 2022 detected over 86,000 'hidden earthquakes,' ten times more than previously recorded. More than half of these occurred in swarms, which can sometimes precede volcanic activity. Experts suggest these tremors are likely caused by seismic activity related to hot water and steam, rather than an imminent magma eruption. If a supereruption were to occur, studies predict widespread ash coverage across up to two-thirds of the US, potentially rendering entire states uninhabitable and disrupting global climate. NASA has proposed a potential, albeit risky and slow, solution involving drilling to cool the supervolcano, estimated to cost $3.46 billion. This method could also harness the Earth's heat for geothermal power generation.