Earth's outer core experiences dramatic shifts in molten iron flow
The Earth's outer core, a voluminous liquid layer of molten iron and nickel, lies approximately 2,800 km beneath the surface and generates the planet's magnetic field. Researchers from the University of Edinburgh and the British Geological Survey mapped 27 years of iron movement, revealing a dramatic shift in 2010. The liquid iron flow below the equatorial Pacific Ocean changed from a slow westward crawl to a more rapid eastward surge, a shift that began to weaken around 2020. These findings, based on data from ground stations and European satellites, suggest that deep-earth liquids can change direction much faster than traditionally theorized, potentially explaining sudden "jerks" in magnetic field readings.
Key Points
- The Earth's outer core is a liquid layer of molten iron and nickel, crucial for generating the planet's magnetic field.
- Researchers observed a significant shift in the outer core's molten iron flow in 2010.
- The flow below the equatorial Pacific Ocean changed from a westward crawl to a rapid eastward surge.
- This shift, which began to weaken around 2020, was linked to seismic and geodetic shifts in the solid inner core.
- The findings suggest that deep-earth liquid movements can be more dynamic than previously thought, influencing magnetic field variations.
Exam Facts
- Outer core depth: around 2,800 km beneath the surface.
- Key elements: Molten iron and nickel.
- Research institutions: University of Edinburgh, British Geological Survey.
- Observed shift year: 2010 (weakening around 2020).
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