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Scientists from the University of Maryland and Arizona State University have used seismic tomography to map two colossal "hot blobs" of dense, anomalous rock deep in Earth's mantle, beneath Africa and the Pacific Ocean. These structures, known as Large Low Shear Velocity Provinces (LLSVPs), are each thousands of kilometers wide and up to a thousand kilometers high, making them larger than Mount Everest. By analyzing how seismic waves travel through the Earth, they created detailed 3D images of these structures. These LLSVPs are thought to be ancient and stable, possibly influencing mantle plumes and volcanism.
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Why It’s Fascinating
This discovery is important because these LLSVPs represent a significant portion of the Earth's deep interior, potentially acting as anchors for mantle plumes that drive hotspot volcanism and affect plate tectonics. It confirms the existence of these large, stable structures, which were previously hypothesized but lacked such detailed mapping. Understanding these "blobs" could improve models for predicting volcanic activity and understanding the long-term evolution of continents over the next decade. Picture two enormous, slow-moving, hot lava lamps hidden deep within the Earth, influencing everything above. Seismologists, volcanologists, and geodynamicists are the main beneficiaries. How do these massive structures relate to the origin of Earth's magnetic field, and have they always been stable?
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