It also revealed annual variations
in local gravity due to the natural storage and depletion of water during rainy and dry seasons in different parts of the world.
This decreasing trend
in local gravity is sufficient to counteract all other sources of local sea - level rise.
Here, there is weakening
of local gravity and enhancing of rebound of the Earth's crust out of the ocean, both caused by the rapid removal of ice mass.
Every 94 minutes or so, twin satellites whip once around Earth at an altitude of 310 miles, taking 30 days to cover the planet's entire surface, then they do it again and again, sensing variations
in local gravity.
Reykjavik is so close to the ice loss of Greenland and Iceland that
its local gravity is weakening.