A new study from the University of Chicago has revealed a surprisingly fluid layer of rock ringing the Earth at the bottom of the upper mantle. Using data from a deep earthquake in the Pacific Ocean near Fiji, geophysicist Sunyoung Park and her colleagues found evidence of a 50-mile thick layer of low-viscosity rock that could explain some seismic observations of \”stagnant\” slabs of rock. This discovery could have implications for how Earth transports heat, cycles and mixes materials between the crust, core, and mantle over time. Park and her team are excited to further explore this technique to learn more about the Earth\’s mantle.
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