Seismic Refraction

Service Description

TDC is a specialist Seismic refraction survey company with many years’ experience applying and researching it’s use in shallow engineering and geotechnical work. Presently it has multiple sets of 24 Channel Seismograph. A TDC seismic survey involves deploying shots at the surface and recordings made via a linear array of sensors (geophones or hydrophones). The shots may be a shotgun, accelerated weight drop or explosive. Seismic refraction is a geophysical principle (see refraction) governed by Snell's Law. Used in the fields of engineering geology, geotechnical engineering and exploration geophysics, seismic refraction traverses (seismic lines) are performed using a seismograph(s) and/or geophone(s), in an array and an energy source. The seismic refraction method utilizes the refraction of seismic waves on geologic layers and rock/soil units in order to characterize the subsurface geologic conditions and geologic structure. The methods depend on the fact that seismic waves have differing velocities in different types of soil (or rock): in addition, the waves are refracted when they cross the boundary between different types (or conditions) of soil or rock. The methods enable the general soil types and the approximate depth to strata boundaries, or to bedrock, to be determined.

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