Earth’s gravity is weaker at the equator due to centrifugal forces produced by the planet’s rotation. It’s also weaker at higher altitudes, further from the planet’s centre, ‘NewScientist’ reported.
Researchers led by Christian Hirt of Curtin University in Australia combined gravity data from satellites and topographic data to map gravity changes between latitudes 60 degree north and 60 degree south, covering 80% of Earth’s land masses. The map consists of more than 3 billion points, with a resolution of about 250 metres. Computing gravity would take 5 seconds per point on an ordinary computer, however, researchers used a supercomputer.
Researchers found the model pinpoints more extreme differences in gravitational acceleration than previously seen.