Monument shrinks…

The Washington Monument may be  10 inches shorter  than it was in 1884,  depending on whether you believe the modern  surveying methods.   We are assured  by the National Geodetic Survey the shrinkage has nothing to do with the 2011 earthquake.   How strange no one thought to mention that the District of Columbia is built on a damned swamp.   Is there a connection between the monument shrinking and Washington expanding?