Social Media Sidebar


Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

When seen through the lens of technology, few resources are truly scarce; they’re mainly inaccessible. 


Peter Diamandis

New research hints at Earth's inner core having its own inner core

Posted in Science on 10th Feb, 2015 06:49 PM by AlexMuller

You may have been taught that the Earth is composed of different layers; a rocky crust and mantle, outside of a liquid outer core and a small, solid iron inner core. It turns out, according to new research, that the inner core may itself have a distinct internal structure.


An inner-inner core about half the diameter of the whole inner core. And this could reveal insights about our planet and its history. A team composed of researchers from the University of Illinois at Urbana-Champaign and China's Nanjing University adapted technology that gauges the strength of an earthquake. Rather than listen in on the seismic wave signals of the initial shock, they measured the waves that resonated in the aftermath of earthquakes around the world between 1992 and 2012.

Seismic waves reverberate through the Earth's layers during an earthquake, effectively "ringing" like a bell that's been struck by a hammer. The waves change as they pass through and bounce back off different layers, and these returning signals help scientists to form a picture of the Earth below its surface, like the impression of an unborn baby that you see in an ultrasound.
"The basic idea of the method has been around for a while, and people have used it for other kinds of studies near the surface," explains lead author Xiaodong Song. "But we are looking all the way through the center of the Earth."
What the researchers found took them by surprise. The inner core is far more complex than previously thought, with the seismic wave data indicating the presence of two distinct parts to the inner core, an outer layer of iron crystals aligned north-south and an inner layer pointed roughly east-west.
The iron crystals of the inner-inner core also behave differently to their outer-inner counterparts, which suggests that they could be made of a different type of crystal or of crystal in a different phase of matter.

Tags: Earthsciencegeologyplanet

Read original article » Back to category


Author: Guest
Posted: 2015-02-11
Now when we are exploring other planets and learning so much about distant places of the universe it comes as a surprise that we are discovering some very important features of our own Earth Reply


Recent headlines

  • Posted in Hardware on 2018-02-23 15:44:23
    World’s largest solar park under development in more
    Posted in Business on 2018-02-23 15:40:28
    SpaceX launches broadband more
    Posted in Science on 2018-02-22 14:29:29
    Anti-depressants: Major study finds they more
    Posted in Business on 2018-02-22 14:26:39
    Can Waymo dominate self driving? more
    Posted in Software on 2018-02-22 14:18:49
    Virtual reality is poised for big business-to-business more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs, more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target more

Recent Blog Posts

  • Posted by AlexMuller
    Martian landscapes formed from sand 'levitating' on a more
    Posted by AlexMuller
    Scientists detect comets outside our solar more
    Posted by AlexMuller
    Advanced artificial limbs mapped in the more
    Posted by AlexMuller
    Bacteria have a sense of more
    Posted by AlexMuller
    Recurrent brain cancer: New hope with phase 1 clinical more

Login to your Account

Login to your PlanetTech Account here

Remember me

Create a New Account

You just need username and password

The following errors occured:
Verify password:
Remember me