Ultralow-Velocity Zones are Leftovers from Early Earth’s Magma Ocean, New Study Suggests geoscience science
. employ seismic data analysis and high-resolution geodynamic modeling to study the origin of ultralow-velocity zones beneath the Coral Sea between Australia and New Zealand. Image credit: Pachhai“Ultra-low velocity zones could be collections of iron oxide, which we see as rust at the surface but which can behave as a metal in the deep mantle,” said Dr. Michael Thorne, a researcher in the Department of Geology and Geophysics at the University of Utah.
To get a clear picture, Dr. Thorne, Dr. Pachhai and their colleagues studied ultra-low velocity zones beneath the Coral Sea, between Australia and New Zealand. But getting a seismic image of something through nearly 2,900 km of crust and mantle isn’t easy. It’s also not always conclusive — a thick layer of low-velocity material might reflect seismic waves the same way as a thin layer of even lower-velocity material. So the researchers used a reverse-engineering approach.
“To our knowledge this is the first study using such a Bayesian approach at this level of detail to investigate ultra-low velocity zones, and it is also the first study to demonstrate strong layering within an ultra-low velocity zone,” Dr. Pachhai said.
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