For my information....... how does the land sink?
Does ir sort of oooze out to sea?
The soil is full of water. When the water table drops (through modern drainage pumping) the soil compacts and sinks.
My limited knowledge is that the land under New Orleans is sediment built up as the Mississippi River deposited it over thousands of years. The land is soft, and compacts as time goes by.
There are other reasons. Right now, NASA says it's sinking at a rate of 1.5 inches a year, which seems high to me.
Large portions of Orleans, St. Bernard, and Jefferson parishes are currently below sea level—and continue to sink. New Orleans is built on thousands of feet of soft sand, silt, and clay. Subsidence, or settling of the ground surface, occurs naturally due to the consolidation and oxidation of organic soils (called “marsh” in New Orleans) and local groundwater pumping. In the past, flooding and deposition of sediments from the Mississippi River counterbalanced the natural subsidence, leaving southeast Louisiana at or above sea level. However, due to major flood control structures being built upstream on the Mississippi River and levees being built around New Orleans, fresh layers of sediment are not replenishing the ground lost by subsidence.[70]
By sucking the OIL out of the ground!
From what i read, can be caused by how land, or
Seabed , very slowly, for very long time, reacts
From the weight of ice in previous ice age once
It has melted., surface will rise in one area,
And sink in another. Google “chesapeake bay
Sinking”, explanation is detailed there.