Ultrashallow seismic reflection monitoring of seasonal fluctuations in thewater table

Ultrashallow seismic-reflection data were collected at a test site in Great Bend, Kansas. The purpose of the experiment was to image seasonal submeter -scale fluctuations in the water table over a period of one year to identif y the factors important in monitoring the water table when using seismic-re flection techniques. The study indicates that detailed velocity information must be used when interpreting water-table levels. Using detailed velocity information as a control when depth-converting the seismic profiles yielde d correct positioning of the water table within +/-12 cm at the test site.