Posted on 01/06/2022 12:19:03 PM PST by BenLurkin
Thin structures that dramatically slow the passage of seismic waves have been identified where Earth’s outer core meets the mantle. ...Ultra Low Velocity Zones (ULVZs) – are made of layers of different material, probably left behind from when the Earth's outer regions were a magma ocean. In particular, at least some ULVZs could have arisen from the same event that caused the Moon's formation.
[M]ost of what we know about the interior structure of our planet comes from observing seismic waves. These waves are to geophysicists what X-rays are to doctors – the internal workings of the planet can be reconstructed from the distortions induced in seismic wave patterns. This is how we know the Earth has a not-entirely rigid core. A new addition to this knowledge involves flat structures where the core meets the mantle, described in Nature Geoscience.
Measurements of seismic waves in the 1990s revealed broad regions no more than 10 kilometers (6.2 miles) high whose composition slowed waves as they passed between mantle and core, or bounced off the boundary, up to 50 percent.
The Tonga-Fiji subduction zone creates the right sort of earthquakes quite frequently....The quakes reveal ULVZs halfway between the source and abundant detectors in both Australia and North America, in prime positions to be studied as waves bounce off them on the way to the detectors.
Just as sedimentary rocks precipitate from an ocean or lake, the researchers believe ULVZs precipitated from a magma ocean. “Heavy elements went down, light ones went up,” Tkalčić added. Early in the Earth’s formation, there may have been several times when it became so hot its outer layers differentiated in this way. Most planetary scientists are confident this occurred when the Earth was struck by a Mars-sized object, throwing up material from which the Moon formed.
(Excerpt) Read more at iflscience.com ...
The Sleestak live there.................
That looks like Frazetta.
Floating dross from the smelting at the earth’s core; lower density, slower sound waves.
Tiamat.
I find planetary science to be fanciful when it is confident the moon was formed out of an impact upon earth. When has it been observed that an orbiting sphere was produced by impact from another sphere? I’m just a simple layman. No claims to make in the way of planetary science.
“Heavy elements went down, light ones went up.” This makes me curious. Does the force of gravity (pull toward center) increase or decrease the closer one gets to earths center? Is there any such force at earth’s center? Again, just a simple layman who is curious.
The way this was explained to me: The impact was unimaginably catastrophic compared to those we have recorded and know of, because Earth’s atmosphere was less dense than today and its field of gravity less stable - also Earth’s mass was less compact. A big piece got knocked away. Not to say, however, that something like that may not happen again.
I am not stating this as a belief, just passing on what I was told.
So were the Sumerians on to something? The “giant impact hypothesis.” of the Sumerians states that Tiamat and Nibiru collided to form the Earth and moon.
“So were the Sumerians on to something? The “giant impact hypothesis.” of the Sumerians states that Tiamat and Nibiru collided to form the Earth and moon.”
Absolutely... Caught in the gravity of Marduk which caused a change in orbit and caused an impact.
Calling Dr. Rick Marshall...
That is somewhat plausible, but chaos developing from such an impact is, at least to me, more plausible. Not a moon behaving as ours does, and has done for as long as history has been recorded.
Imagine if you could go to the exact center of the Earth, the net attraction by Earth’s gravity on you would be zero since the attraction would be from all directions.
Im glad grandpa saved her. Grandma was a babe-o-rama.
I don’t necessarily believe that interpretation - how do I know what really happened? I wasn’t there!
Fascinating thought, yet is it not true that there would be significant force brought to bear by virtue of all the matter drawn toward the center? Water pressure, for example, increases rather than decreases closer to center, no?
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.