United States Geological Survey

Missouri Department of Natural Resources

What exactly is a sinkhole?

A sinkhole forms when the surface layer of ground collapses into a cavity underneath. Associate Professor of Geology at MU Martin Appold explains these features in more detail:

“They’re holes in the ground that form as a result of caves developing below the ground’s surface that come close enough to the ground’s surface that at some point the rock can’t support its own weight.”

“Ultimately the cause is from ground water that is percolating through the fractures, usually in limestone bedrock,” Appold said. 

United States Geological Survey

The United States Geological Survey, or USGS, is taking to the sky this week with a low-flying airplane that will map the subsurface of the New Madrid Seismic Zone. The plane will collect aeromagnetic data in Missouri’s Bootheel and small slivers of northeastern Arkansas and northwest Tennessee.