Researchers from The University of Alabama discovered a dense layer of ancient ocean floor, or ultra-low velocity zone (ULVZ), between Earth's core and mantle using seismic imaging. These underground 'mountains' could play a key role in heat escape from the core and the planet's magnetic field. T
Seismic waves from earthquakes in the southern hemisphere sample the ULVZ structure along the Earth’s CMB and are recorded by sensors in Antarctica. Credit: Edward Garnero and Mingming Li, Arizona State University
“Seismic investigations, such as ours, provide the highest resolution imaging of the interior structure of our planet, and we are finding that this structure is vastly more complicated than once thought,” said Dr. Samantha Hansen, the George Lindahl III Endowed Professor in geological sciences at UA and lead author of the study. “Our research provides important connections between shallow and deep Earth structure and the overall processes driving our planet.
Researchers lower seismic equipment into place at one of the Antarctic stations in 2012. Credit: Lindsey Kenyon These subtle signals were used to map a variable layer of material across the study region that is pencil thin, measuring in the tens of kilometers, compared to the thickness of the Earth’s dominant layers. The properties of the anomalous core-mantle boundary coating include strong wave speed reductions, leading to the name of ultra-low velocity zone.
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