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Ned Wallace of the National Park Service stands over a manhole Tuesday at the base of the Washington Monument in Washington, containing a smaller obelisk in a well 12-feet deep which was used as a geodetic marker and referred to as “the mini monument.” Government surveyors are collecting data around the Washington Monument and other sites on the National Mall that will reveal whether it has sunk or tilted since last year’s earthquake.

Stories this photo appears in:

Did Washington Monument sink or tilt from quake?

The Washington Monument cracked and crumbled when a 5.8-magnitude earthquake shook the nation’s capital last year.

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