Scaled…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/e/6/8/e6888a7dfb_82227_solide.jpg” data-url=”https://news.google .com/sciences/definitions/solid-chemistry-15332/” data-more=”Read More”> .
The outer core consists essentially of about 80 to 85%very hot in The melting point of water, which is the temperature at which ice melts…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal /7/d/0 /7d0df59f3c_82086_fusion .jpg” data-url=”https://news.google.com/sciences/definitions/physics-fusion-15305/” data-more=”Read more”> . It is stirred by a movement of of thermal origin (due to the cooling of the Earth) and thanks to it, the Earth’s magnetic field is created. the , it is formed by progressive crystallization of the outer core and resembles a very hot and dense sphere the size of . When Pluto was discovered by Clyde Tombaugh in 1930, it was thought to be the ninth planet in the solar system. But from the late 20th century, other fairly similar objects were discovered, including Eris, which it marginally surpassed. It appeared quickly…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/0/5/d/05dfff5cf7_75287_plutonnh-2307-01-stern-02c-pluto- nat- color.jpg” data-url=”https://news.google.com/sciences/definitions/universe-pluto-3691/” data-more=”Read more”> also composed but solid. On the other hand, its exact nature and who it has been discussed for decades and makes the research areas of geophysics and geochemistry very active.
Techniques for observing and examining the core
One of the problems with studying the Earth’s inner core is that it cannot be seen, forcing researchers to use tricks and indirect methods to obtain information about its nature and dynamics. With this in mind, researchers Wei Wang and John Vidale – scientists at USC Dornsife – used data from the Large aperture seismic array (Lasa), a facility for networked seismometer systems from the USAForce in Montana, which allows acquisition and increase the sensitivity of detection and explosions.
This type of data is obtained using special signal processing techniquesB. Beamforming, which suppresses noise and thus improves the signal-to-noise ratio.
Using a new beamforming technique developed by Vidale, the two researchers analyzed waves generated by Soviet underground nuclear bomb tests at Milrow in 1969 and Cannikin in 1971 under Amchitka Island. They used the same method for the period between 1971 and 1974 in the arctic archipelago of Novaya Zemlya.
How does the core of the earth behave?
In their latest study, recently published inUsing this seismic data, Wang and Vidale determined that the inner core motion had changed direction over the six-year period from 1969 to 1974, rotating the underrotation by at least a tenth of a degree per year. More specifically, observations indicate that the inner core spun slightly more slowly from 1969 to 1971, and then began to move in the opposite direction from 1971 to 1974.
This observation is quite unexpected and first surprised researchers Wang and Vidale. Having an oscillating inner core was a model that had been thought of and existed, but the scientific community was very divided as to the viability of this theory. In addition, some scientists claim that this pattern also explains the observed sharp six-year oscillation in day length (plus or minus 0.2 seconds over six years) that has been observed regularly in recent decades.
It turns out, therefore, that theis not fixed at all, as we thought for a long time, but that it moves and vibrates under our feet. However, the era of is a thing of the past, meaning scientists have to use seismic data from Earth activity, which despite recent advances in instrumentation is relatively less accurate.
#Journey #center #earth #core #fixed