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The Quicktime video shows how much the ground falls and rises during discharge and recharge of the groundwater basin below Los Angeles and the surrounding basin.
During the dry season (Summer/Fall) water is pumped out of the aquifer.
Then the rain and snow during the wet season (Winter/Spring) soaks into the ground, recharging the aquifer.
The rise and fall of the ground can be up to 2 inches upward and downward.
In the video orange depicts the ground sinking, while blue shows water recharge raising the ground upward.
NASA says the changes in the ground level were measured with "radar interferometry, generating more than 42 interferograms from synthetic aperture radar (SAR) acquired by ESA's ERS-1 and ERS-2 satellites. An interferogram is a map of the relative changes in the distance between the satellite and surface of the earth, expressed as differences in phase. The interferometric technique measures ground deformation with a precision of 2.8 centimeters (~ 1 inch)."