<
https://theconversation.com/seismic-echoes-reveal-a-mysterious-donut-inside-earths-core-237489>
"About 2,890 kilometres beneath our feet lies a gigantic ball of liquid metal:
our planet’s core. Scientists like me use the seismic waves created by
earthquakes as a kind of ultrasound to “see” the shape and structure of the
core.
Using a new way of studying these waves, my colleague Xiaolong Ma and I have
made a surprising discovery: there is a large donut-shaped region of the core
around the Equator, a few hundred kilometres thick, where seismic waves travel
about 2% slower than in the rest of the core.
We think this region contains more lighter elements such as silicon and oxygen,
and may play a crucial role in the vast currents of liquid metal running
through the core that generate Earth’s magnetic field. Our results are
published today in
Science Advances."
Cheers,
*** Xanni ***
--
mailto:xanni@xanadu.net Andrew Pam
http://xanadu.com.au/ Chief Scientist, Xanadu
https://glasswings.com.au/ Partner, Glass Wings
https://sericyb.com.au/ Manager, Serious Cybernetics
