Seismic refraction data is collected from geophones that record the arrival of energy sent through the shallow subsurface by sledgehammer blows at the surface. Alec Spears (left) and Troy Covill were ...
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. Disclaimer: AAAS and EurekAlert! are ...
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