The Earth has shifted

It isn't the dam, it is all the water behind it that is responsible.

From 1994 to 2012, the Three Gorges Dam created a huge reservoir containing about 39.3 billion cubic meters—equivalent to roughly 10 trillion gallons of water. Scientists at NASA’s Goddard Space Flight Center have confirmed that the added weight caused Earth’s rotation axis to shift approximately two centimeters, or about three-quarters of an inch.

Two centimeters may seem tiny compared to Earth’s massive size, but in terms of planetary physics, it is a significant shift. The reservoir’s weight presses down on the Earth’s crust above sea level, redistributing mass inside the planet and affecting the moment of inertia—a physical property determining how fast the planet spins.

At 8 pounds/gal. the water above weighs about 80 trillion pounds.
 

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