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"The body-centered cubic crystal structure forms a cube with atoms in each corner and a further atom in the middle of this cube. It is oriented in such a way that its great diagonal is directed along the earth’s axis of rotation, which makes it possible for the iron to evince sound propagations with the velocities observed."
"If you take out the five major mascons on the near side of the moon, orbits are much more stable," said Alex Konopliv, a GRAIL planetary scientist at NASA's Jet Propulsion Lab in Pasadena, Calif. He added that the far side of the moon has smaller mascons, which have weaker gravitational pulls."
These waves make the whole Earth ring like a bell and travel through the entire Earth. The movement of these waves within the Earth’s crust can cause minor to major damage to structures on the surface of the Earth, especially close to the origin of the earthquake. The damage depends on the intensity of the original stress and how it travels through the crust.
Some of the vibrations are of high enough frequency to be audible, while others are of very low frequency. These vibrations cause the entire planet to quiver or ring like a bell or tuning fork.