Hollow Moon, Hollow Earth?, page 1
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Topic started on 13-5-2004 @ 04:04 PM by darkAngel
This author has a habit of copying content from the Unexplained Mysteries site without giving credit, and is accumulating warnings as a result.

His post came from here:
www.unexplained-mysteries.com...



[Edited on 14-5-2004 by SkepticOverlord]

Yes am very sorry about that but i am not fully used to posting in forums and using the posting utilities

[Edited on 14-5-2004 by darkAngel]


reply posted on 13-5-2004 @ 09:28 PM by kinglizard
The Earth has a solid Iron core; we know this by detecting earthquake vibrations and their travel through the earth.




For 60 years geophysicists have suspected that the Earth's inner core was solid - now they have proved it.

By detecting special seismic tremors in the aftermath of a massive Indonesian earthquake, the seismologists from Northwestern University and the French Atomic Energy Commission have shown without doubt that at the heart of the Earth is a solid iron-nickel ball, 2400km in diameter.

The key to the breakthrough is the behaviour of the two types of seismic waves. Pulse waves can travel through both liquids and solids as they move by compressing and then relaxing the material in the direction of travel.

Shear waves, in contrast, can only pass through solids. They vibrate at right angles to the direction of travel and as liquids have no material strength the signal rapidly dissipates in the fluid.

So they then had to exploit the different speeds at which the waves travel. Imagine a seismic wave rumbling down through the Earth. When it reaches the outer core, all shear waves are lost and only pulse waves continue. When the pulse waves reach the inner core the waves are partly refracted and reflected.

This allows part of the energy to convert into shear waves that then travel through the inner core. Shear waves travel more slowly than pulse waves so they reach the opposite side of the inner core later. Here they are partly converted back to pulse waves.

It was these delayed pulse waves that the scientists detected.



news.bbc.co.uk...

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