Seismic Refraction Data Collection (IMAGE) Dickinson College Caption Seismic refraction data is collected from geophones that record the arrival of energy sent through the shallow subsurface by sledge hammer blows at the surface. Credit R. Callahan Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.