As is known, gravity is not the same at every point on Earth. Canada’s northern Hudson Bay has a weaker gravity field than the global average, and this has intrigued scientists for some time. So much so that this difference can even cause you to lose weight immediately when traveling to Hudson Bay, even though the difference is almost unnoticeable.

gravity in Hudson Bay, 0.004% lower than the world average. Although this difference is very small, it can be detected with sensitive measuring equipment.

There are some theories about the Hudson Bay anomaly

Two major theories have recently emerged regarding this gravitational anomaly. The first theory attributes this situation to the Ice Age. 20,000 years ago, the Laurentide Ice Sheet, which was 3 kilometers thick, covered most of North America. This massive ice sheet pushed down the soil and crust in the area. Although this glacier melted quickly when the ice age ended, the compressed crust still could not fully return to its previous level.

This process of crustal recovery in Hudson Bay continues at a rate of about 12 millimeters per year. It can take about 300,000 years for the crust to regain its previous shape. is considered. This slow recovery reduces the mass density in the region, causing gravity to be lower than in other regions.

The second theory suggests that movements in the Earth’s mantle layer cause this anomaly. Just below the Earth’s crust is the mantle, which consists of a layer of molten rock. This layer is constantly moving with currents that are heated by the core and push the crust up or down. This type of current under Hudson Bay causes the Earth’s crust to pull downward, decreasing its mass and weakening gravity.

Satellite data obtained in 2002 supports both theories. Low gravity in Hudson Bay, thanks to both changes in the Earth’s crust since the Ice Age and currents in the mantle. is formed. Interestingly, this weak gravity is likely to persist even if the crust fully recovers.

So what do you think about this issue? You can share your thoughts with us in the comments section below.