TRIBUNJATENG.COM – Recently, scientists discovered Earth’s core is tilted below Indonesian Banda Sea.
In the eastern hemisphere, the core grows 60 percent larger than in the west, explaining the differences in the speed of seismic waves that can cause earthquakes, volcanic eruptions, and other phenomena.
Scientists themselves do not know the exact cause.
What is clear is that the dense iron core in the center of the planet has been growing faster under Indonesia’s Banda Sea, according to findings by seismologists at the University of California at Berkeley.
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The solid iron is the product of iron crystals that form when molten iron cools, but something in the Earth’s outer core or mantle beneath the south Asian country gives off heat at a faster rate than on the opposite side, beneath Brazil.
Reporting from independent.co.uk, the faster the cooling, the faster the iron crystallization occurs and the faster its growth increases.
Such a difference has significant implications for Earth’s magnetic field, and it is the convection currents in the core that generate this field that protect us from harmful solar particles.
“We put a rather loose limit on the age of the inner core – between half a billion and 1.5 billion years – which could help in the debate about how magnetic fields were generated before the existence of a solid inner core,” said Barbara Romanowicz, UC Berkeley Professor of the Graduate School in the Department of Earth and Planetary Sciences and director emeritus of the Berkeley Seismological Laboratory (BSL).
“We know the magnetic field existed three billion years ago, so other processes must have driven convection in the outer core at that time.”
The relatively young age of the inner core suggests that, in the history of our planet, the heat that kept molten iron came from the lighter elements separated from the iron, not from the crystallization of iron.
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