Confirming some wells
The Missouri Department of Natural Resources maintains a network of 73 groundwater observation wells in 50 counties across the state. The wells measure and record the depth of groundwater in many aquifers to see how the water level changes over time.
The quake Sunday off the coast of northern Sumatra sent shock waves around the globe, causing fluctuations in groundwater. Most changes were small, but there was an 8.5-inch variation in the water in the well in Aurora, in Lawrence County in southwestern Missouri.
St. Louis Post-Dispatch, 12/31/04
Aurora, MO is southwest of Springfield -- 37.00 N by 93.60 W, estimating from a road atlas.
[Fortunately, no resonance with the New Madrid fault system.]