Seismic Wave
A single refraction reading.
https://www.codot.gov/business/designsupport/materials-and-geotechnical/programs/geotech/assets/SeisWave2.jpg/view
https://www.codot.gov/business/designsupport/materials-and-geotechnical/programs/geotech/assets/SeisWave2.jpg/@@download/image/SeisWave2.jpg
Seismic Wave
A single refraction reading.