Tag

Geoid

All articles tagged with #geoid

science1 month ago•5 min saved

Antarctic Gravity Dip Unmasks 70 Million Years of Deep-Earth Dynamics

Researchers reconstructed the Antarctic geoid low over ~70 million years, showing a persistent gravity valley shaped by deep mantle flow and evolving upper-mantle buoyancy. A major change in amplitude and position occurred between 50 and 30 million years ago, linked to long‑term subduction and upwelling, with a possible connection to true polar wander and Antarctica’s ice-sheet history. The study cautions that while deep-Earth dynamics can reshape the gravity field, translating this into climate or ice-sheet impacts requires further work.

via Indian Defence Review|

#antarctica #geoid #gravity

science-and-technology2 years ago•2 min saved

Unraveling the Mystery of the Indian Ocean's Gravity Hole

Scientists have used supercomputers to simulate the formation of the "gravity hole" in the Indian Ocean, a depression that experiences less gravity than the rest of the planet. The study suggests that the cause of the gravity hole is likely due to plumes of magma under the Earth's crust, formed by the drifting and collision of India's subcontinent with Asia 40 million years ago. The researchers ran simulations dating back 140 million years, with six of them leading to the formation of the gravity hole. However, some experts argue that the study fails to account for certain factors and that the simulated geoid differs from Earth's real surface shape.

via Forbes|

#geoid #gravity-hole #indian-ocean

science2 years ago•1 min saved

Unraveling the Mystery of the Gravity Hole in the Indian Ocean

Scientists have discovered a "gravity hole" in the Indian Ocean, where the pull of gravity is lower than average, resulting in a lower sea level. This phenomenon is likely caused by magma plumes that have been flowing for the past 20 million years. The researchers believe that when these plumes eventually stop, the gravity hole will dissipate. This finding provides valuable insights into Earth's geoid and gravitational variations.

via BGR|

#geoid #gravity-hole #indian-ocean