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Researchers are not claiming the tornado itself was the direct reason the seismographs detected activity. Instead, they are analyzing the correlation of the atmospheric pressure prior to the tornado. There are some indices that show seismic activity prior to a tornado forming and hitting the ground. During the February 29 event, scientists found a slow and small tilting of the seismograph that lasted for several minutes. Hamburger called it a pressure-related signal and said it might help scientists better understand atmospheric activity that takes place right before tornadoes touch down.