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Seismic Refraction

By Earthquake Hazards Program 2021 (approx.)
Illustration of a person hammering a plate on the ground. The ground has two layers: yellow sediment and gray bedrock. The hammering is creating arrows, one angled down from the point of impact and multiple angled up evenly spaced apart after hitting the bedrock layer.
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Detailed Description

A seismic refraction or seismic reflection line is a set of seismographs usually lined up along the earth's surface to record seismic waves generated by an explosion for the purpose of recording reflections and refractions of these waves from velocity discontinuities within the earth. The data collected can be used to infer the internal structure of the earth.

Sources/Usage

Image courtesy of Geosphere, Inc.