How land subsidence contributes to sea level rise Today’s Video of the Day from NASA Goddard describes how land subsidence alters the shape of ocean basins and contributes to sea level rise.
During the last ice age about 20,000 years ago, the northeastern region of the United States, Canada, and other regions were weighed down by ice sheets. When the ice melted and its weight was lifted, the land surface slowly rebounded.
The resulting land movement, as well as subsidence related to human activities, play a significant role in sea level rise. For example, the Mississippi River Delta is essentially drowning as sinking ground is combined with higher sea levels, according to NASA. Also in substances can occur in various ways during an earthquake. Broad areas of land can subside drastically during an earthquake because of offset along fault lines. Land subsidence can also occur as a result of settling and compacting of unconsiderate sediment from the shaking of an earthquake. The blunder occur, absolute subsidence may occur in the hanging wall of normal faults. As the cumulative moisture deficit is reversed, which can last up to 25 years, the surface level around the tree will rise and expand laterally.
Video Credit: NASA Goddard