350-mile-deep earthquake used in scientific study to make elusive measurements of the Earth’s layers. There may be a layer of surprisingly fluid rock ringing the Earth, at the very bottom of the upper mantle, according to a new study from a University of Chicago scientist. The finding was made
to infer the different layers that make up the planet, including the crust, mantle, and core.
Park thought there might be a unique way to get a measurement of the mantle’s properties by studying the aftermath of very deep earthquakes. However, when the scientists carefully analyzed the data from GPS sensors on several nearby islands, they found the Earth kept moving—after the earthquake was over.
This is the first solid observation of the deformation following deep quakes; the phenomenon had been observed before for shallow earthquakes, but experts thought the effect would be too small to be observable for deep earthquakes.“Even though the mantle makes up the largest part of Earth, there’s still a lot we don’t know about it.
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