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Earth's surprise inside: The inner core seems to have its own inner core

Earth's surprise inside: The inner core seems to have its own inner core | Teacher Tools and Tips | Scoop.it

Thanks to a novel application of earthquake-reading technology, a research team at the University of Illinois and colleagues at Nanjing University in China have found that the Earth’s inner core has an inner core of its own, which has surprising properties that could reveal information about our planet. 

Led by Xiaodong Song, a professor of geology at the U. of I., and visiting postdoctoral researcher Tao Wang, the team published its work in the journal Nature Geoscience on Feb. 9. 

“Even though the inner core is small – smaller than the moon – it has some really interesting features,” said Song. “It may tell us about how our planet formed, its history, and other dynamic processes of the Earth. It shapes our understanding of what’s going on deep inside the Earth.”

Researchers use seismic waves from earthquakes to scan below the planet’s surface, much like doctors use ultrasound to see inside patients. The team used a technology that gathers data not from the initial shock of an earthquake, but from the waves that resonate in the earthquake’s aftermath. The earthquake is like a hammer striking a bell; much like a listener hears the clear tone that resonates after the bell strike, seismic sensors collect a coherent signal in the earthquake’s coda. 


Via Dr. Stefan Gruenwald
Sharrock's insight:

Does this mean Earth Science and geology books might need a small revision?

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Rescooped by Sharrock from Eclectic Technology
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Learning Never Stops: 50 websites that help make learning science fun

Learning Never Stops: 50 websites that help make learning science fun | Teacher Tools and Tips | Scoop.it

"Without a doubt my most popular posts have consistently been science websites. Below, I have combined all the science websites that I have shared so far and have added nine new ones. Whether you have been following my blog, or if this is your first time, I promise you will find many great resources for your students."


Via Beth Dichter
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Sally Tilley's curator insight, April 7, 2014 9:52 PM

What an incredibly well-sourced collation of resources...follow this immediately! Thanks so much for sharing!

Sally Tilley's curator insight, April 7, 2014 9:52 PM

What an incredibly well-sourced collation of resources...follow this immediately! Thanks so much for sharing!

Elizabeth Brookfield's curator insight, April 8, 2014 5:35 AM

Must check a few of these out...