velocity mapping

Seismic Refraction Tomography (SRT) is a seismic imaging method that uses the first-arrival times of compressional P-waves to reconstruct subsurface velocity variations. ecause wave velocity changes between soils, sediments and rocks, travel-time differences can reveal stratigraphic boundaries, bedrock geometry and lateral geological changes. Tomographic inversion iteratively adjusts a velocity model until calculated and measured arrival times agree.

Acoustic (ultrasound) tomography

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